Welcome to Barcelona
Welcome to Barcelona
We analyze the modifications that a dense nuclear medium induces in the Ds(2317)± and Tcc(3875)±. In the vacuum, we consider them as isoscalar DK (Dbar Kbar) and DD (Dbar Dbar) S-wave bound states, which are dynamically generated from effective interactions that lead to different Weinberg compositeness scenarios. Matter effects are incorporated through the two-meson loop functions, taking...
In quantum chromodynamics (QCD), perturbation theory cannot always be employed in order to compute observables, due to the energy-dependent nature of the strong coupling constant, particularly in the low-energy regime where quarks and gluons are confined. Thus, non-perturbative techniques are required. We employ the variational method, a rigorous, non-perturbative approach which provides...
We have generated an updated version of the pΩ potential for low-energy interactions based on an effective field theory approach at leading order. This potential, together with other potentials based either on different parametrizations or lattice QCD, have been used to solve the Schrödinger equation numerically, obtaining the scattering wave functions for different values of the relative...
A Monte-Carlo simulator has been designed to generate events of a proton-pion scattering employing a realistic model based on the unified Chew-Mandelstam SAID parametrization. Using the generated data, a partial wave analysis of the final state of the system is performed. The energy dependent partial-wave amplitudes are derived analytically using Barrelet zeros of the moments. This study also...
Similar to the crossover phase transition in lattice QCD, at high temperature and small baryon chemical potential, recently, the structure of neutron stars have been studied with a crossover equation of state to model a smooth transition from a pure neutron matter to massless quarks [1]. The switch function, that guides the crossover, was constrained in order to reproduce neutron stars up to...
In the framework of the Born-Oppenheimer effective field theory, the hyperfine structure of heavy quarkonium hybrids at leading order in the
1/mQ expansion is determined by two potentials. We estimate those potentials by interpolating between the known short-distance behavior and the long-distance behavior calculated in the QCD effective string theory. The long-distance behavior depends, at...
I will discuss recent advances on the description of lepton-nucleus interactions in the energy region relevant for oscillation experiments. Various methods employing Quantum Monte Carlo techniques have been employed to derive the presented results.
The Facility for Antiproton and Ion Research (FAIR) in Darmstadt, which is being built close to GSI Helmholtzzentrum Darmstadt, makes significant progress in its mission to provide unique opportunities for a rich and multidisciplinary research program. The mission of FAIR comprises the investigation of QCD-Matter and QCD-Phase Diagram at highest baryon density; nuclear structure and nuclear...
Heavy-flavor hadrons with non-conventional properties have been observed
over the past two decades. Some of these states have both quarkonium and
exotic interpretations, while several other states exhibit a distinct
exotic internal structure, including charged, open-flavor, double
heavy-flavor, and full heavy-flavor states. Interpretations of these
states vary, ranging from tightly-bound...
Recent applications of the subtracted second random-phase approximation (SSRPA), based on Skyrme functionals, to the study of Gamow-Teller excitations and beta-decay will be presented. The comparison with the conventional random-phase approximation (RPA) results and experimental data is also discussed. It is found that, the amount of Gamow-Teller strength obtained in SSRPA is much lower than...
Neutron star merger events are unique laboratories for exploring matter under extreme temperatures and densities. These conditions might harbor exotic particles like hyperons. In this talk I will discuss how the presence of hyperons influences the properties of matter (equation of state) and how this manifests in observable phenomena. The main focus will be on the distinct signatures arising...
Nucleon elastic form factors encode crucial information about its charge and
magnetization distributions. For many decades, nucleon form factors were studied by
using unpolarized electron-nucleon cross section measurements. The advent of electron
beams with higher luminosities and beam polarization coupled with large acceptance
detectors, polarized targets and recoil polarimeters enabled a...
The J-PET [1, 2, 3] is a high-acceptance multi-purpose detector optimized
for the detection of photons from positron-electron annihilation and can be used
in a broad scope of interdisciplinary investigation, e.g. medical imaging, fun-
damental symmetry tests, and quantum entanglement studies, etc. For this
purpose, the Positronium system, which consists of a bound state of an electron
and...
The cores of neutron stars (NS) reach densities several times the nuclear saturation density and could contain strangeness containing exotic particles such as hyperons. During the binary inspiral, viscous processes inside the NS matter can damp out the tidal energy induced by the companion and convert this to thermal energy to heat up the star. We demonstrate that the bulk viscosity...
The nature of the three narrow pentaquark states observed by the LHCb in 2019 remains a puzzle to the hadron physics community. While the hadronic molecule picture is favored by most analyses due to their proximity to two-hadron thresholds, a compact or even virtual state interpretation have yet to be completely ruled out. In addition, a purely-kinematic rescattering mechanism involving a...
The ALICE experiment, optimized to study nuclei collisions at the ultra-relativistic energies provided by the LHC, is approaching to a new upgrade phase, foreseen in 2026 during the third Long Shutdown of the accelerator. This upgrade includes the replacement of the 3 innermost layers of the Inner Tracking System, the detector closest to the interaction point, which is currently made of 7...
Neutrinoless double-beta decay ($0\nu\beta\beta$)is a transition in nuclei where two neutrons simultaneously transform into two protons, accompanied by the emission of only two electrons [1]. This second-order process, if observed, would proof that neutrinos are Majorana particles (their own antiparticles), shed light on the existence of massive neutrinos and explain the predominance of...
The search for new particles in the low mass range is motivated by new hidden sector models and dark matter candidates introduced to account for a variety of experimental and observational puzzles: the small-scale structure puzzle in cosmological simulations, anomalies such as the 4.2σ disagreement between experiments and the standard model prediction for the muon anomalous magnetic moment,...
We show that results for the thermodynamics of strongly interacting matter obtained by state of the art Monte-Carlo simulations of lattice QCD can be adequately described within a generalized Beth-Uhlenbeck type approach, where the hadron resonance gas (HRG) phase appears as a statistical ensemble of multi-quark clusters. The underlying chiral quark dynamics is coupled to a background gluon...
The Positron Working Group at Jefferson Lab is designing a positron source, transport beamlines, and experiments for an exciting physics program to begin in the mid-2030’s. Some topics which will play important roles include Deeply Virtual Compton Scattering as a probe of GPDs, improving our understanding of the nucleon EM form factors, precision studies of 2-photon exchange, and searches for...
Inverse problems, in particular those related to obtaining the scattering amplitudes from experimental data, are known to be hard, both conceptually and numerically. Recently, JPAC collaboration has developed a Deep Neural Network based approach that allows to address essential parts of this problem. We showed that a neural network trained with synthetic differential intensities calculated...
ePIC will be a general-purpose detector designed to enalbe the entire physics program of the Electron-Ion Collider (EIC) at BNL, USA. Several key physics measurements depend on efficient Particle Identification (PID). The PID system of ePIC covers a wide pseudorapidity (-3.3<η<3.5) and momentum range. Several technologies have been identified to serve such purpose.
In the forward region...
$2\nu \beta \beta$ decay to excited states of heavy nuclei
In double-beta decay, two neutrons convert into two protons, accompanied by the emission of two electrons. According to the Standard Model (SM), this decay, called two-neutrino double-$\beta$ decay ($2\nu \beta \beta$ decay), involves the emission of two antineutrinos, maintaining an equilibrium between matter and antimatter and...
We propose a scenario where the existence of a scalar, electrically neutral flavor-singlet three-diquark bound state, the light sexaquark S(uuddss), with a mass well below the double-Λ threshold M_{ΛΛ} = 2231.4 MeV entails the gravitational instability of low-mass neutron stars due to its Bose-Einstein condensation (BEC) [1]. Since in this state the neutron star core loses the pressure support...
Investigating the potential feeble interaction between particles in the Standard Model (SM) and the Dark Sector (DS) is a significant frontier in particle physics. One possible manifestation of this feeble interaction is the dark photon, theorized as a vector gauge mediator that interacts very weakly with SM fermions.
The BGOOD photoproduction experiment combines a central electromagnetic...
R&D efforts are ongoing to develop the Cylindrical Micromegas Barrel Layer (CyMBaL) for the central region of the ePIC detector, the first experiment at the future Electron Ion Collider (EIC).
The Micromegas detectors will be a part of a multi-technology tracker that needs to fit inside a 1.7 T solenoid, bringing stringent constraints on space. Additionally, a low material budget is necessary...
Physicists have been captivated by the spectrum of hadrons for decades, seeking to better comprehend the fundamental building blocks of matter. While various experiments have laid the foundation for this spectrum, Lattice Quantum Chromodynamics (Lattice QCD) has revealed new states with forbidden $J^{PC}$ values. This has challenged the constituent quark model, suggesting *exotic hybrid...
Precision spectrum shape measurements in nuclear beta decay can be used for testing the Standard Model and physics beyond it with accuracy being competitive with high-energy collider experiments. Such a comparison can be carried out in the framework of effective field theory. The most prominent and poorly known effect in the Standard Model is weak magnetism [1], the higher-order recoil...
We propose a modification to the relativistic mean-field $\sigma-\omega$ model by incorporating the Pauli-blocking effect arising from quark exchange interactions between baryons. In dense baryonic matter, where nucleon wave functions exhibit finite overlap, the quark exchange effects governed by the Pauli principle become significant at high densities. A quantitative estimate for this process...
Precision measurements involving nuclei are at the cutting edges of nuclear physics and testing the Standard Model (SM) of physics. For instance, precision beta decay measurments have the potential to constrain beyond SM physics at TeV scales. To interpret these experiments, it is crucial to have comparably accurate theoretical predictions of relevant quantities along with an accurate...
The fundamental QCD symmetries at low energies and the new physics Beyond the Standard Model (BSM) are two frontiers in the contemporary physics. The Primakoff effect, a process of high-energy photo- or electro-production of mesons in the Coulomb field of a target offers a powerful experimental tool to explore both fundamental issues. A comprehensive Primakoff experimental program has been...
In quantum chromodynamics (QCD), perturbation theory cannot always be employed in order to compute observables, due to the energy-dependent nature of the strong coupling constant, particularly in the low-energy regime where quarks and gluons are confined. Thus, non-perturbative techniques are required. We employ the variational method, a rigorous, non-perturbative approach which provides...
We have generated an updated version of the pΩ potential for low-energy interactions based on an effective field theory approach at leading order. This potential, together with other potentials based either on different parametrizations or lattice QCD, have been used to solve the Schrödinger equation numerically, obtaining the scattering wave functions for different values of the relative...
A Monte-Carlo simulator has been designed to generate events of a proton-pion scattering employing a realistic model based on the unified Chew-Mandelstam SAID parametrization. Using the generated data, a partial wave analysis of the final state of the system is performed. The energy dependent partial-wave amplitudes are derived analytically using Barrelet zeros of the moments. This study also...
Similar to the crossover phase transition in lattice QCD, at high temperature and small baryon chemical potential, recently, the structure of neutron stars have been studied with a crossover equation of state to model a smooth transition from a pure neutron matter to massless quarks [1]. The switch function, that guides the crossover, was constrained in order to reproduce neutron stars up to...
In the framework of the Born-Oppenheimer effective field theory, the hyperfine structure of heavy quarkonium hybrids at leading order in the
1/mQ expansion is determined by two potentials. We estimate those potentials by interpolating between the known short-distance behavior and the long-distance behavior calculated in the QCD effective string theory. The long-distance behavior depends, at...
$K_1$ and $K^*$ are chiral partners, both with vacuum widths smaller than 100 MeV, making them a suitable pair that can be realistically measured.
Based on the fact that the mass difference between the chiral partners is an order parameter of chiral phase transition and that the chiral order parameter reduces substantially at the chemical freeze-out point in ultra-relativistic heavy ion...
Conventional high-resolution techniques for $\beta$-decay spectroscopy utilize high-purity germanium detectors to measure individual $\gamma$ rays emitted after $\beta$ decay. However, these measurements are affected by the Pandemonium systematic error [1], resulting in many high-energy $\gamma$ rays and a significant portion of the $\beta$ strength being missed. The Total Absorption...
We analyse recent lattice data for the gravitational form factor of the pion within the framework of known theoretical information such as Chiral Perturbation Theory, Large Nc and perturbative QCD.
The Electron-Ion Collider (EIC) stands as a groundbreaking facility to illuminate the subatomic world, particularly the structure of nuclear matter. This presentation explores the EIC's potential as a new 'pentaquark factory', enabling not only the discovery of new pentaquarks, but also the precise characterization of their properties. Its extraordinary luminosity and spin polarization...
We examine which first order phase transitions are consistent with today's astrophysical constraints. In particular, we explore how a well-constrained mass-radius data point would restrict the admissible parameter space and to this end, we employ the most likely candidates of the recent NICER limits of PSR J0030+0451. To systematically vary the stiffness of the equation of state, we employ a...
We study quasinormal $f-$mode oscillations in neutron star(NS) interiors within the linearized General Relativistic formalism. We utilize approximately 9000 nuclear Equations of State (EOS) using spectral representation techniques, incorporating constraints on nuclear saturation properties, chiral Effective Field Theory ($\chi$EFT) for pure neutron matter, and perturbative Quantum...
This talk presents unprecedented correlation measurements involving Λ, Ξ, kaons and pions obtained by ALICE in pp collisions at 𝑠√
= 13 TeV. Several measurements are presented for the first time, constituting new experimental constraints on the S = −1, −2 meson-baryon interactions and the nature of exotic states. The strong interactions involving mesons and baryons with strangeness content...
The internal structure of all lowest-lying pseudo-scalar mesons with heavy-light quark content is studied in detail using an algebraic model that has been applied recently, and successfully, to the same physical observables of pseudo-scalar and vector mesons with hidden-flavor quark content, from light to heavy quark sectors. The algebraic model consists on constructing simple and...
The measurement of a permanent electric dipole moment (EDM) in atoms is crucial for understanding the origins of CP-violation. Quadrupole and octupole deformed nuclei exhibit significantly enhanced atomic EDM. However, accurate interpretation of the EDM in such systems requires the characterization of their deformation. While nuclear deformation is indicated in various structure models,...
Strangeness production in heavy-ion collisions reveals the modification of the properties of strange hadrons in hot and dense nuclear matter. Adopting in-medium properties of antikaons $(\bar K = K^-, \bar K^0)$ described by the self-consistent coupled channel unitarized scheme based on a SU(3) chiral effective Lagrangian (G-matrix), we study strangeness production in heavy-ion collisions...
Experimental data on the interaction between vector mesons and nucleons are a crucial input for understanding the pattern of in-medium chiral symmetry restoration (CSR) and dynamically generated excited N($\Delta$) states. However, accessing these interactions is hampered by the short-lived nature of the vector mesons, making traditional scattering experiments unfeasible. In recent years the...
The massive stars end their lives by supernova explosions leaving central compact objects that may evolve into neutron stars. Initially, after birth, the star remains hot and gradually cools down. We explore the matter and star properties during this initial stage of the compact stars considering the possibility of the appearance of deconfined quark matter in the core of the star. Nonradial...
The Compressed Baryonic Matter (CBM) experiment is under construction at the Facility for Antiproton and Ion Research (FAIR). It aims to explore the phase structure of strongly interacting (QCD) matter at large net-baryon densities and moderate temperatures by means of heavy-ion collisions in the energy range sqrt(s_NN) = 2.9 - 4.9 GeV. As fixed-target experiment, CBM is equipped with fast...
The neutron-rich isotopes of hydrogen, such as $\rm ^{6}H$ and $\rm ^{7}H$, are good platforms for the study of NN interactions in neutron-rich environments because they have the largest neutron-to-proton ratios known so far. However, the experimental and theoretical studies of them are still limited. For $\rm ^{6}H$, the energy of its ground state is still controversial. It is about 2.7 MeV...
The world’s largest sample of J/ψ events accumulated at the BESIII detector offers a unique opportunity to investigate η and η′ physics via two body J/ψ radiative or hadronic decays. In recent years the BESIII experiment has made significant progresses in η/η′ decays. A selection of recent highlights on the transition form factor measurements of η/η′ at BESIII are reviewed in this report.
This study investigates the radial oscillations of hybrid neutron stars, characterized by a composition of hadronic external layers and a quark matter core. Utilizing a density-dependent relativistic mean-field model that incorporates hyperons and $\Delta$ baryons for describing hadronic matter, and a density-dependent quark model for quark matter, we analyze the ten lowest eigenfrequencies...
This talk will present recent experimental findings at BESIII, encompassing three distinct studies. Firstly, the search for the production of deuterons and antideuterons in e+e- annihilation at center-of-mass energies between 4.13 and 4.70 GeV is discussed. The investigation aims to unravel the production mechanisms and properties of these light nuclei, shedding light on the dynamics of...
Deviations from the typical liquid-drop-like saturated density of the nucleus are a focal point in the exploration of nuclear structure. Phenomena of nucleon localisation, such as clustering or bubble structures, provide a distinctive perspective on the macroscopic consequences of nuclear interaction.
We performed a proton-transfer direct reaction to probe the wavefunction of $^{46}$Ar and...
Direct photons produced in heavy ion collisions are penetrating probes
and as such encode the entire space-time history of the collision, from
the initial hard scattering till the final kinetic freeze-out. For the
very same reason theoretical models are challenged to connect and balance
many different production mechanisms. Simultaneous observation of large
yields and large azimuthal...
In this talk I will present the main predictions of the holographic graviton soft-wall model (GSW). In particular, I will discuss the properties of mesons, glueballs and, recently, hybrids. This model relies on a semi-classic approximation of non perturbative QCD. Within this approach, QCD fields are described via their duals propagating in a modified space, with respect to the usual AdS5. For...
In this paper, we conduct a Monte Carlo simulation study to investigate the production of strange and multi-strange hadrons in high-multiplicity proton-proton collisions. Our objective is to refine and validate the hadronic interaction models crucial for air shower simulations such as EPOS, QGSJET, SIBYLL, and PYTHIA. These models play a pivotal role in predicting the propagation of extensive...
There seem to exist two lightest axial mesons with charm whose masses are very similar but the associated widths and other properties are different. These mesons are denominated as D1(2430)D1(2430) and D1(2420)D1(2420). Although two mesons with similar masses are expected to exist, with such quantum numbers, within the traditional quark model, as we discuss the description of their decay...
A reliable prediction of electroweak processes involving a nucleus is required to further understand nuclear structure and other related topics, such as nucleosynthesis and particle physics. In the past two decades, the range of applicability of nuclear ab initio calculations has been rapidly extending and reaching mass number of 200 systems. Yet, the reproduction of magnetic dipole moment,...
The PrimEx-eta experiment at Jefferson Lab is conducting a new measurement of the radiative decay width of the $\eta$-meson via the Primakoff effect from the $\eta$-meson photoproduction off a helium
nucleus. The produced $\eta$-meson can be reconstructed by detecting either $\eta \to 2\gamma$ or $\eta \to 3\pi$ decays. A precise measurement of $\Gamma(\eta \to \gamma\gamma)$ will improve...
In this contribution, I will present a short, personal overview of nuclear Density Functional Theory (DFT). Two specific aspects will be emphasised. Compared to so-called ab initio approaches, DFT is more phenomenological; however, it can be applied throughout the whole isotope chart and account for many observables that
ab initio cannot handle so far like, for instance, the excited...
The GlueX experiment at Jefferson Lab was specifically designed for precision studies of the light-meson spectrum. A photon beam with energies of up to 12 GeV is directed onto a liquid hydrogen target contained within a hermetic detector with near-complete neutral and charged particle coverage. Linear polarization of the photon beam with a maximum around 9 GeV provides additional information...
It is important to obtain information on YN and YY interaction from study of structure of hypernuclei. For this purpose, I have been studying $\Lambda$ hypernuclei for $\Lambda N$ interaction. In this conference, I will report of structure of $\Xi$ hypernucei and $\Xi N$ interactions.
We start from the assumption that the Λc(2940) and Λc(2910) correspond mostly to D∗N bound states with JP = 1/2− and 3/2−, respectively. Then, adding a D meson as a third particle, and as- suming that the DN and DD∗ interactions are mainly dominated by the Λc(2765) and Tcc(3875) resonances, we look for the possible binding of the D∗DN three body system within the framework of the Fixed Center...
We study the three-body baryonic B decay B¯0s → pΛK¯ within the framework of the pole model via the baryonic Λ_b pole. In our calculation, we require the strong coupling constant gΛ_b B_s Λ and investigate if gΛ_bB_sΛ = 10.49±1.57 is adopted, the branching ratio agrees with the experimental result, reported by the LHCb collaboration.
We have calculated the femtoscopic correlation functions of meson-baryon pairs in the strangeness $S=-1$ sector, employing a unitarized chiral interaction model up to next-to-leading order. We will show results for the $\pi^- \Lambda$ correlation function, which is presently under analysis by the ALICE@LHC collaboration. We will also demostrate that the employed interaction is perfectly...
Chiral trajectories of dynamically generated resonances are connected to the SU(3) breaking pattern and their nature. From an analysis of a recent LQCD simulation on the $\pi\Sigma-\bar{K}N$ scattering for $I=0$, and the study of the quark mass dependence of the octet baryons, we determine for the first time the trajectory of the two poles associated to the $\Lambda(1405)$ towards the...
Relativistic Heavy Ion Collisions allow to create ultra hot and dense systems, where a phase transition from hadronic matter to quark-gluon matter is expected to occur. Nowadays the progress of experimental techniques allows to analyze these collisions on an event-by-event basis, and the most advanced theoretical simulations are performed within the so-called hybrid models, where different...
Neutron stars (NSs) are unique laboratories to probe matter in extreme conditions that
cannot be currently reproduced on Earth. Nuclear physics experiments, in tandem
with astrophysical observations, can give valuable insight into the properties
of dense matter encountered in these stellar objects.
The connection between astrophysical observations and microphysical properties of
NSs...
We are all individuals made up of a unique combination of characteristics and experiences, some of which assist us in our physics careers while others make us feel we don’t belong. In this talk I will use my own journey to highlight issues of diversity and inclusion. How, as a woman physicist, I went from understanding how my personal experiences were actually part of a wider picture of gender...
I will discuss the recent progress in understanding photo production of hybrid mesons
The saturation properties of symmetric and asymmetric nuclear matter have been computed using the finite range simple effective interaction (SEI) having Yukawa form factor. The results for higher order derivatives of the energy per particle and the symmetry energy computed at saturation, namely,$Q_0$, $K_{sym}$, $K_\tau$, $Q_{sym}$, are compared with the corresponding range of values...
The diffusion of heavy quarks (HQ) in the quark-gluon plasma (QGP) produced in ultra-relativistic heavy-ion collisions has been a successful probe of the HotQCD matter, allowing to identify a marked non-perturbative dynamics and inferring a spatial diffusion $D_s$ coefficient in agreement with first quenched lattice QCD data, even if within still significant uncertainties.
I will review some...
CEBAF at Jefferson Lab delivers the world's highest intensity and highest precision multi-GeV electron beam to study strong interactions in the nonperturbative regime. The current program at 12 GeV is well underway and the CEBAF community is looking toward its future at the science that could be obtained through a future upgrade at higher beam energy. JLab at 22 GeV will provide unique,...
The PRad experiment, performed recently in Jefferson Lab, demonstrated the advantages of the calorimetric method over the previously used magnetic spectrometer technique in scattering experiments to measure the proton charge radius with a high accuracy. Our first result, within the experimental uncertainties, agreed with the small radius extracted from the muonic hydrogen spectroscopy...
The quest to constrain the equation of state (EoS) of ultra-dense matter and thereby probe the behaviour of matter inside neutron stars core is one of the main goals of modern astrophysics. A promising method involves investigating the long-term cooling of neutron stars, comparing theoretical predictions with various sources at different ages. However, limited observational data and...
The Super Tau Charm Facility (STCF), a planned symmetric electron-positron collider in China, aims to facilitate $e^+e^−$ collisions across a center-of-mass energy range of 2 to 7 GeV, targeting a peak luminosity of $0.5×10^{35}\mathrm{cm}^{−2}\mathrm{s}^{−1}$. With an anticipated annual integrated luminosity exceeding $1~ab^{−1}$, the STCF is poised to generate vast datasets. These will...
The dominant interaction between a heavy quark and antiquark at low energy is described through the static potential. The real part of the potential becomes screened with a screening mass proportional to the temperature, and the imaginary part of the potential gives bound-states a non-zero width. As the temperature increases bound-states can disappear either because they are no longer...
In the context of the anomalous magnetic moment of the muon, the hadronic contribution plays a crucial role, especially concerning the error budget estimation. Currently, lattice QCD simulations confront the dispersive calculations based on e+e- hadronic cross sections. The new MUonE experimental proposal pretends to shed light on that situation. Still, a powerful method to extract the desired...
In this talk I will present a method to compute the properties of dilute nuclear matter from quantum field theory at finite density. This approach provides a parameter-free calculation of the energy per particle of nuclear matter relying only on experimental nucleon-nucleon phase shifts. As a practical application we will show our predictions for the equation of state of dilute symmetric and...
Fragmentation functions, one of the key components of the factorisation theorem used for computing cross sections for heavy-flavour hadron production, are typically constrained in $\textrm e^{+}\textrm e^{-}$ and ep collisions due to their non-perturbative nature.
However, recent measurements of charm-hadron spectra and ratios at the LHC have questioned the universality of fragmentation...
The CERN secondary beam lines of the North and the East Area are designed to deliver beams of secondary and tertiary particles as well as attenuated primary protons and ions from the SPS and PS accelerators. With its diverse portfolio, the CERN experimental areas serve over 200 test beams and experiments per year with more than 2000 users. In context of the Physics Beyond Colliders (PBC)...
High-statistics total cross-sections for the vector meson photoproduction at the threshold: $\gamma p \to \omega p$ (from A2 at MAMI), $\gamma p \to \phi p$ (from CLAS at JLab), and $\gamma p \to J/\psi p$ (from GlueX at JLab) allow to extract absolute value of vector meson nucleon scattering length using Vector Meson Dominance model. The “young” vector meson hypothesis may explain the fact...
Fragmentation functions are indispensable for understanding processes of hadron production ubiquitously existing in high-energy collisions, but their first principle determination has never been realized due to the NP-hard nature in traditional lattice calculation. We propose a framework that makes a first step for exploiting quantum computing to evaluate the Parton fragmentation function. The...
We have recently provided the generic band of equations of state for matter at attainable densities in zero- and finite-temperature neutron stars restricted only by hadronic physics and fundamental principles, which are crucial for testing General Relativity and theories beyond it. We also characterise any first-order phase transitions therein by the specific latent heat, which we have...
Charm quarks, due to their significant mass, serve as an excellent tool for investigating the de-confined medium composed of quarks and gluons. These charm quarks interact with this medium and carry crucial information about it before they undergo hadronization to form heavy flavor hadrons. In this study, we employ the color string percolation model (CSPM) and the van der Waals Hadron...
We present recent efforts in the determination of the distribution of partons in the pion, with an emphasis on uncertainty quantification. The Fantômas project aims to explore the role of trial shapes for the distribution of quarks and gluons in the final uncertainty that results from global analyses. The first results within the Fantômas framework show that impact for PDFs of the pion, which...
The GlueX experiment at Jefferson Lab aims to map the spectrum of light mesons through photoproduction, with a focus on searching for hybrid mesons, a predicted category of hadrons containing excited gluonic degrees of freedom. Achieving this goal requires a precise theoretical understanding of the underlying production mechanisms. In the GlueX energy regime, single meson photoproduction...
One of the future plans at Jefferson Lab is running electron scattering experiments with large acceptance detectors at luminosities of 1037 cm−2s−1. These experiments allow the measurements of the Double Deeply Virtual Compton Scattering (DDVCS) reaction, an important physics process in the formalism of Generalized Parton Distributions, which has never been measured because of its low rate....
Neutron stars unite several extremes of physics which cannot be recreated on Earth, making them excellent cosmic laboratories for studying the properties of ultra-dense matter. One exciting characteristic is the presence of superfluid and superconducting components in mature neutron stars. Albeit created under very different circumstances, such macroscopic quantum behaviour exhibits many...
The GlueX experiment at Jefferson Laboratory seeks to map out the spectrum of light mesons produced from a linearly polarized photon beam. The production and decays of a light meson resonance $X$ such as $\gamma p\rightarrow Xp' \rightarrow \omega\pi^0 p'$ can be modeled with polarized vector-pseudoscalar amplitudes, which can describe the contribution of individual amplitudes to the total...
The creation of a quark-gluon plasma (QGP) is expected in heavy ion collisions. It came as a surprise that proton-proton collisions at ultrarelativistic energies show as well a "QGP-like" behavior and signs of the creation of a fluid, although the corresponding system size is not more than a few cubic femtometers. Even more surprisingly, also heavy flavor particles seem to be part of the...
The suppression of the structure functions of bound nucleons in nuclei com- pared to those of free nucleons, observed in deep inelastic scattering experiments, is known as the EMC effect. Its origin is an open question and there is no general explanation for it.
The deuteron is a great system to study the EMC effect. It is a bound system, thus the nucleon structure functions are expected to...
We start from the assumption that the Λc(2940) and Λc(2910) correspond mostly to D∗N bound states with JP = 1/2− and 3/2−, respectively. Then, adding a D meson as a third particle, and as- suming that the DN and DD∗ interactions are mainly dominated by the Λc(2765) and Tcc(3875) resonances, we look for the possible binding of the D∗DN three body system within the framework of the Fixed Center...
We study the three-body baryonic B decay B¯0s → pΛK¯ within the framework of the pole model via the baryonic Λ_b pole. In our calculation, we require the strong coupling constant gΛ_b B_s Λ and investigate if gΛ_bB_sΛ = 10.49±1.57 is adopted, the branching ratio agrees with the experimental result, reported by the LHCb collaboration.
We have calculated the femtoscopic correlation functions of meson-baryon pairs in the strangeness $S=-1$ sector, employing a unitarized chiral interaction model up to next-to-leading order. We will show results for the $\pi^- \Lambda$ correlation function, which is presently under analysis by the ALICE@LHC collaboration. We will also demostrate that the employed interaction is perfectly...
Chiral trajectories of dynamically generated resonances are connected to the SU(3) breaking pattern and their nature. From an analysis of a recent LQCD simulation on the $\pi\Sigma-\bar{K}N$ scattering for $I=0$, and the study of the quark mass dependence of the octet baryons, we determine for the first time the trajectory of the two poles associated to the $\Lambda(1405)$ towards the...
Relativistic Heavy Ion Collisions allow to create ultra hot and dense systems, where a phase transition from hadronic matter to quark-gluon matter is expected to occur. Nowadays the progress of experimental techniques allows to analyze these collisions on an event-by-event basis, and the most advanced theoretical simulations are performed within the so-called hybrid models, where different...
Charm physics, which involves a heavy up-type quark, offers a unique environment in which to search for new particles and couplings beyond the Standard Model. Studies with charmed hadron decays complement those in B physics, expanding the potential to observe BSM phenomena. The Belle II experiment has an active charm physics program that includes studies of rare decays, CP violation, flavor...
LHCb has collected the world's largest sample of charmed hadrons. New measurements of direct and time-dependent CP violation and of $D^0 -\overline{D}^0$ mixing parameters are here presented, along with prospects for the sensitivity at the LHCb upgrades.
Explaining gravitational-wave (GW) observations of binary neutron star (BNS) mergers requires an understanding of matter beyond nuclear saturation density. Our current knowledge of the properties of high-density matter relies on electromagnetic and GW observations, nuclear physics experiments, and general relativistic numerical simulations. We perform numerical-relativity simulations of BNS...
We report the latest results from the spectroscopy of deeply bound pionic Sn 121 atoms performed at RIBF, RIKEN. We have determined the binding energies and the widths of the pionic orbitals and deduced the pion-nucleus interaction with unprecedented precision. After extensive analysis, we deduced that the chiral condensate at nuclear saturation density is reduced by a factor of 60+-3% (T....
In April 2022, AGATA, the European Ge-array at the forefront of gamma detection technology [1,2] was installed at LNL. Based on the new concept of gamma-ray tracking, it can identify the gamma interaction points (pulse shape analysis) and reconstruct via software the trajectories of the individual photons (gamma-ray tracking). Shortly thereafter a physics campaign has started using stable...
We study the $\Omega_c(3120)$, one of the five $\Omega_c$ states observed by the LHCb collaboration, which is well reproduced as a molecular state from the $\Xi^*_c \bar K$ and $\Omega^*_c \eta$ channels mostly. The state with $J^P = 3/2^-$ decays to $\Xi_c \bar K$ in the $D$-wave and we include this decay channel in our approach, as well as the effect of the $\Xi^*_c$ width [1]. With all...
We investigate the intricate relationships between the non-radial (f) mode oscillation frequencies of neutron stars (NS)s and the corresponding nuclear matter equation of state (EOS) using a machine learning (ML) approach within the ambit of the relativistic mean field (RMF) framework for nuclear matter. With two distinct parameterizations of the Walecka model, namely, (1) with non-linear...
The correlation between the charge radii differences in mirror nuclei pairs and the neutron skin thickness has been studied with the so-called finite-range effective interaction over a wide mass region. The so far precisely measured charge radii differences data within their experimental uncertainty ranges in $^{34}$Ar-$^{34}$S, $^{36}$Ca-$^{36}$S, $^{38}$Ca-$^{38}$Ar and $^{54}$Ni-$^{54}$Fe...
The strong and electromagnetic interactions are two main decay mechanisms
in charmonium decays. The relative phase between them is a basic parameter in understanding the
decay dynamics, especially for the precise measurements. Based on indirect studies on Jpsi two body
decay modes: 1-0-, 0-0-, 1-1-, and NNbar, the relative phase is around 90 degrees. There is also some results from...
In this note we study the tensor and vector exchange contributions to the elastic reactions involving the pseudoscalar mesons π+π−, K+K−and D+D−. In the case of the tensor-exchange contributions we assume that an intermediate tensor f2(1270) is dynamically generated from the interaction of two virtual ρ mesons, with the use of a pole approximation. The results show very small contributions...
Some time ago, a tetraquark mixing model was proposed to explain the structure of the two nonets in the $J^P=0^+$ channel :
the light nonet, consisting of $a_0(980)$, $K_0^*(700)$, $f_0(500)$, $f_0(980)$,
and the heavy nonet, comprising $a_0(1450)$, $K_0^*(1430)$, $f_0(1370)$, and $f_0(1500)$.
In this talk, we will review the tetraquark mixing model and highlight its successful aspects,...
The meaningful correlations between the zero-sound modes and the stiffness of the nuclear equation of state (EOS) are uncovered in nuclear matter with the relativistic mean-field theory. It is demonstrated that the high-density zero-sound modes merely exist in models with the stiff EOS. While the stiff EOS can be softened by including $\omega$-meson self-interactions (the $\omega^4$ term), the...
The ALICE collaboration has recently reported pi+-K_S femtoscopic correlations in pp collisions. Here we show [1] how they can be well described using existing realistic pi-K interactions obtained from a dispersive analysis of scattering data [2], containing an accurate description of the kappa/K0*(700) resonance pole.
[1] in progress: M. Albaladejo, A. Canoa, J.M. Nieves, J.R.Pelaez and...
In this talk, based on the work [PRD109,054008], we develop a model aimed at understanding the three mass distributions of pairs of mesons in the Cabibbo-suppressed $D^+_s \to K^+ \pi^+ \pi^-$ decay recently measured with high statistics by the BESIII collaboration. The largest contributions come from the $\rho^0$ and $K^{*0}$ related decay modes, but the $K^*_0(1430)$ and $f_0(1370)$ modes...
The understanding of the renormalization mechanisms of electroweak currents is nowadays a cornerstone of the nuclear structure research. It is motivated by the need of calculating reliable nuclear matrix elements for the neutrinoless double-$\beta$ decay. Our approach to the problem is the realistic nuclear shell model. It provides a consistent framework to derive effective Hamiltonians and...
The discussion of light pentaquarks, which was once sparked by the good agreement between the theoretical prediction[1] and the first measurement of the $\Theta^+$[2], has become dormant after the subsequent null results of the $\Theta^+$ baryon from worldwide experiments. However, the recent observation of heavy pentaquarks by the LHCb Collaboration[3] has revitalized interest in pentaquark...
We study the J/ψ → ϕπ+a0(980),(a0 → π−η) decay, evaluating the double mass distribution in terms of the π−η and π+a0 invariant masses. We show that the π−η mass distribution exhibitsthe typical cusp structure of the a0(980) seen in recent high statistics experiments, and the π+a0
spectrum shows clearly a peak around Minv(π+a0) = 1420 MeV, corresponding to a triangle singularity. When...
The rapid neutron capture process, or r process, is responsible for the production of half of the elements between iron and uranium found in nature. During the r-process nucleosynthesis, several thousands of neutron-rich nuclei are synthesized in few seconds, powering an electromagnetic transient known as kilonova. Since most of such exotic nuclei have never been experimentally observed due to...
Cusp structures in spectra represent discontinuities in the differential cross sections, which are widely observed at the thresholds of scattering channels.
In the K^- d→πΛN reaction, a cusp at the ΣN threshold exists in the ΛN invariant mass spectrum.
This study investigates the shape of the spectrum at the ΣN threshold by treating the scattering process as a two-body...
Unitarity of the Cabibbo-Kobayashi-Maskawa quark mixing matrix is a testable prediction of the Standard Model. The most precise constraint, the Cabibbo unitarity constraint, is currently provided by a combination of superallowed nuclear beta decays and kaon decays, testing SM self consistency at the 0.01% level. Recent improvements in the theory of SM radiative corrections to beta decays...
The BESIII experiment at the electron-positron collider BEPCII in Beijing (China) is successfully operating since 2008 and has collected large data samples in the tau-mass region, including the world’s largest data samples at the J/ψ and ψ 0 resonances. The recent observations of hyperon polarizations at BESIII opens a new window for testing CP violation, as it allows for simultaneous...
Transverse momentum moments (TMMs) are defined as weighted integrals of transverse momentum distributions. They provide integral information about the hadron structure, such as average momentum, width, etc; and could be determined from the distributions and directly from the data. I review the theory and phenomenology of TMMs based on the recent N4LL analysis of Drell-Yan data.
Several femtoscopy correlation functions have been calculated in the strangeness sectors $S=0$ and $S=-2$ for meson-baryon interactions. We combine the interactions of chiral perturbation theory at leading order with the TROY (T-matrix-based Routine for HadrOn femtoscopY) framework. We predict the correlation function for the $\pi^{+}$p and $\pi^-$p channels, which are currently under analysis...
In the coalescence of binary neutron stars nonequilibrium processes unfold. The dynamics of these processes is influenced by the material’s transport coefficients. A comprehensive understanding of the transport coefficients of ultradense matter becomes imperative, as these are determined by the microscopic composition and the dominant interactions of its constituents. To this end we compute...
One of the major themes in QCD is to elucidate the QCD phase diagram with temperature and density. The possibility of inhomogeneous chiral condensation in low-temperature and high-density regions has been discussed using effective models such as the Nambu-Jona-Lasinio model. It has also been pointed out that the dispersion relation of Nambu-Goldstone bosons may change in this phase. Therefore,...
Traditionally, the study of strong interactions at the hadronic level has successfully relied on scattering experiments. Recently, however, new femtoscopic correlation measurements for hadronic pairs have provided further insights into the strong interaction between particles, especially at lower momenta. In this work, we use both types of datasets in parallel to perform theoretical...
The Time Dependent Hartree-Fock (TDHF) approach is a microscopic self-consistent mean-field model to describe dynamical processes of many-body systems. We modify the open-source Sky3D code, which implements TDHF with a Skyrme functional, and repurpose it to employ the Barcelona-Catania-Paris-Madrid (BCPM) energy density functional. We present preliminary results for both static and dynamical...
The transport and spectral properties of heavy quarks and quarkonia in hot QCD matter are a central ingredient to describe heavy-flavor observables in high-energy heavy-ion collisions. We discuss recent progress in evaluating these properties in a nonperturbative quantum many-body approach where the basic two-body interaction kernel is constrained by various quantities that can be computed...
Quantum many-body systems often stabilize by creating non-uniformity in them. Clustering in nuclei is one of good examples. Since the discovery of α-decay and later prediction/observation of the Hoyle state in 12 C, nuclear physicists have investigated mechanism how clusters occur in nuclei and how they play roles in synthesis of heavier elements. So far the scope of cluster research has been...
The SIDDHARTA-2 experiment, conducted at the INFN-LNF DAΦNE collider, is currently engaged in a data collection campaign aimed at achieving the first-ever measurement of the strong-interaction-induced shift and width on the 1s level of kaonic deuterium. Exploiting the superior quality of the low-energy kaon beam provided by the DAΦNE collider in Frascati, Italy, and employing state-of-the-art...
In this work, we perform a Bayesian analysis putting together the available knowledge from the nuclear physics experiments and astrophysical observations to explore the equation of state of supranuclear matter. In particular, we employ a relativistic metamodeling technique to nuclear matter to cover the uncertainties in the parameter space of the saturation properties of nuclear matter, both...
Exploring the light-quark mass dependence of near-threshold exotic states provides insights into their internal structure. In this talk, we introduce a novel approach based on chiral effective field theory to extract the properties of such states from lattice energy levels [1]. This approach benefits from the incorporation of left-hand cuts originating from long-range interactions, thereby...
We calculate the Next to Leading Order corrections to inclusive production of a quark-antiquark pair in a strong color field. We show that all possible divergences either cancel or are absorbed into evolution of physical quantities. We show how our results can be used for precision studies of quark production in ultra-peripheral heavy ion collisions.
"Solving the quantum many-body problem involves non-trivial challenges arising from the exponential growth of the Hilbert space dimension, which restricts the applicability of numerically exact techniques to relatively small systems. I will discuss how variational Monte Carlo methods, based on artificial neural networks, can provide a systematically improvable solution to the quantum many-body...
We have attempted to mitigate the challenge of connecting the neutron star (NS) properties with the nuclear matter parameters that describe equations of state (EOSs). The efforts to correlate various neutron star properties with individual nuclear matter parameters have been inconclusive.
A Principal Component Analysis is employed as a tool to uncover the connection between multiple nuclear...
Ab initio is the expression used to refer to the subset of techniques in nuclear structure that perform calculations from "first principles". While being the most accurate approach in describing atomic nuclei to the date, it is still not used in many fields of nuclear physics due to its high computational cost.
Recently, a method dubbed Neural Quantum States was proposed, and there are...
Non-perturbative resummation at finite temperature via the Gribov gluon propagator was proposed by D. Zwanziger in 2005 [1]. Later, in 2013, it was used by K. Fukushima and N. Su [2] to study gluon thermodynamics. In 2015, N. Su and T. Tywoniuk showed that a novel massless excitation is ascribable to the magnetic scale in quark dispersion relations.
We recently used the non-perturbative...
We recall that the chiral unitary approach for the interaction of
pseudoscalar mesons with the baryons of the decuplet predicts two states
for the $\Xi(1820)$ resonance, one with a narrow width and the other one
with a large width. We contrast this fact with the recent BESIII
measurement of the $K^- \Lambda$ mass distribution in the $\psi(3686)$ decay to
$K^- \Lambda \bar\Xi^+ $, which...
It has been argued that the formation of a molecular-like quasi-bound state, $\Lambda(1405)$, arises from the strong attraction between $\overline{K}N$ with isospin I = 0 channel. Furthermore, its strong attraction suggests the existence of kaonic nuclei in a three-body system, $K^{-}pp$, as well as in more complex many-body systems.
Some calculations suggest existence of various types of...
In our work we present general predictions for the static observables of neutron stars (NSs) under the hypothesis of a purely nucleonic composition of the ultra-dense baryonic matter, using Bayesian inference on a very large parameter space conditioned by both astrophysical and nuclear physics constraints.
The equation of states are obtained using a unified approach of the NS core and...
When two particles form a nearly resonant bound state due to short-range attractive forces, an effective long-range three-body emerges giving rise to an infinite number of three-body bound states with a discrete scale invariance. This phenomena, called Efimov effect, was first described in the 1970's by V. Efimov [1]. The Efimov effect has been mostly studied in atomic physics, due to its...
We solve a Boltzmann equation that describes the dynamics of coupled massless quark and gluon fluids undergoing transversally homogeneous boost-invariant expansion. The quark and gluon components are taken to have the same dynamical anisotropy parameter, but we introduce a fugacity parameter that allows quarks to be out of chemical equilibrium, as expected right after the formation of the QGP...
It is important to investigate the in-medium quark condensates to understand the mechanism of the spontaneous breaking of chiral symmetry. The up and down quark condensates in nuclear medium are studied by pionic atoms and low energy pion nucleus scattering. It is found that the magnitude of the ud quark condensates may be reduced by 30% at the nuclear saturation density. This is known as...
Quantum entanglement offers a unique perspective into the underlying structure of strongly-correlated systems such as atomic nuclei. Using different entanglement metrics on equipartitions of the valence space, we analyze the structure of light and medium-mass berillyum, oxygen, neon and calcium isotopes within the nuclear shell model, and we identify mode-entanglement patterns related to the...
The long-sought equation of state of hadronic matter across a wide range of densities and temperatures, based on first principles with quarks and gluons i.e. quantum chromodynamics remains one of the key issues in physics. Over the past decade, a widely rich variety of data pouring in from laboratory experiments as well as astrophysical observations, including the detection of gravitational...
Measurements at the LHC have provided evidence for collective behavior in high-multiplicity proton-proton (pp) and proton-lead (pPb) collisions through multiparticle correlation techniques. To investigate detailed properties of this collectivity, a comprehensive study of differential Fourier coefficients ($v_{n}$) in particle transverse momentum ($p_\mathrm{T}$) and event multiplicity is...
This study presents a simulated quantum computing approach for the investigation into the shell-model energy levels of $^{58}$Ni through the application of the variational eigensolver (VQE) method in combination with a problem-specific ansatz. The primary objective is to achieve a fully accurate low-lying energy spectrum of $^{58}$Ni. In this study, we utilized two distinct shell model spaces:...
I report the results of the Regge model study of the spin density matrix elements (SDMEs) of the $\Delta(1232)$ in the photoproduction reaction ${\vec\gamma} p \to X^-\Delta^{++}$ where $X\in(\pi,b_1)$. These reactions are being studied by GlueX in its ongoing efforts to understand the spectrum the light hybrid mesons. The intensity profile of the photoproduction of resonance(s) from a...
Hypernuclei provide important information to constrain the hyperon-nucleon (YN) and three-baryon (YNN) interactions. In this contribution, we will discuss our recent results obtained using chiral YN [1,2] and chiral YNN interactions for light hypernuclei up to $A=8$.
We use the hypernuclei data to determine the charge-symmetry breaking (CSB) of YN interactions and for exploring the...
Due to the spin-orbit coupling, Dirac fermions, submerged in a thermal bath with finite macroscopic vorticity, exhibit a spin polarisation along the direction parallel to the vorticity vector Ω. Due to the symmetries of the Lagrangian for free massless Dirac particles, there are three independent and classically conserved currents corresponding to the vector, axial, and helical charges. We...
There is an increasing interest to develop quantum circuits capable of performing many-body quantum simulation motivated by their scaling advantages against classical devices. We present an analysis of the performance of various Variational Quantum Eigensolvers methods for the 6Li nucleus in the shell model framework. In particular, our work is focused on the construction of efficient...
The possible existence of deeply-bound $\bar K$-nuclear bound states (kaonic nuclei) has been widely discussed as a consequence of the strongly attractive $\bar K N$ interaction in I = 0 channels. The investigation of kaonic nuclei can provide unique information about the $\bar K N$ interaction below the threshold, which is still not fully understood.
For the simplest kaonic nucleus, $\bar...
The Belle and Belle$~$II experiments have collected a $1.4~\mathrm{ab}^{-1}$ sample of $e^+e^-$ collision data at centre-of-mass energies near the $\Upsilon(nS)$ resonances. These data include a 19.2$~$fb$^{-1}$ sample collected near the $\Upsilon(10753)$ resonance to probe its potentially exotic nature. We present several results related to the following processes: $e^+e-\to...
Several femtoscopy correlation functions have been calculated in the strangeness sectors $S=0$ and $S=-2$ for meson-baryon interactions. We combine the interactions of chiral perturbation theory at leading order with the TROY (T-matrix-based Routine for HadrOn femtoscopY) framework. We predict the correlation function for the $\pi^{+}$p and $\pi^-$p channels, which are currently under analysis...
In the coalescence of binary neutron stars nonequilibrium processes unfold. The dynamics of these processes is influenced by the material’s transport coefficients. A comprehensive understanding of the transport coefficients of ultradense matter becomes imperative, as these are determined by the microscopic composition and the dominant interactions of its constituents. To this end we compute...
One of the major themes in QCD is to elucidate the QCD phase diagram with temperature and density. The possibility of inhomogeneous chiral condensation in low-temperature and high-density regions has been discussed using effective models such as the Nambu-Jona-Lasinio model. It has also been pointed out that the dispersion relation of Nambu-Goldstone bosons may change in this phase. Therefore,...
Traditionally, the study of strong interactions at the hadronic level has successfully relied on scattering experiments. Recently, however, new femtoscopic correlation measurements for hadronic pairs have provided further insights into the strong interaction between particles, especially at lower momenta. In this work, we use both types of datasets in parallel to perform theoretical...
The Time Dependent Hartree-Fock (TDHF) approach is a microscopic self-consistent mean-field model to describe dynamical processes of many-body systems. We modify the open-source Sky3D code, which implements TDHF with a Skyrme functional, and repurpose it to employ the Barcelona-Catania-Paris-Madrid (BCPM) energy density functional. We present preliminary results for both static and dynamical...
We analyze different problems related to the physics of hadrons under extreme conditions of temperature and chemical potentials. On the one hand, we show that the thermal resonances $f_0(500)$ and $K^∗_0(700)$, generated in the framework of Unitarized Chiral Perturbation Theory $\pi\pi$ and $K\pi$ scattering at finite temperature, play an essential role with respect to chiral and $U(1)_A$...
We present a first calculation of the unpolarized proton's isovector transverse-momentum-dependent parton distribution functions (TMDPDFs) from lattice QCD, which are essential to predict observables of multi-scale, semi-inclusive processes in the standard model. We use a $N_f=2+1+1$ MILC ensemble with valence clover fermions on a highly improved staggered quark sea (HISQ) to compute the quark...
A search for the $H$-dibaryon has been conducted at J-PARC using a 1.8 GeV/c $K^-$ beam, in June 2021. The E42 experiment was designed to maximize sensitivity from a loosely bound $H$ to resonances near $\Lambda\Lambda$ and $\Xi^-p$ thresholds with the Hyperon Spectrometer. A time-projection chamber (HypTPC) reconstructs all charged particles' trajectories that emerged from the $^{12}$C$(K^-,...
Microscopic approach based on quantum chromodymanics (QCD) is the most challenging ab initio theory for nuclear structure physics. In this respect, QCD sum rule gives a powerful tool, but numerically not highly demanding, to cross a bridge the QCD and hadron spectroscopy such as meson and baryon masses in terms of chiral symmetry breaking due to quark condensation. In nuclear medium, a...
Selected experimental measurements on quarkonium production in proton-proton and heavy-ion collisions will be presented. Particular attention will be given to those that could help us to build a unified physics picture which can reconcile our understanding of particle production in all collision systems.
The existence of exotic multi-quark states beyond the conventional valence three quark and quark-antiquark systems has been unambiguously confirmed in the heavy quark sectors. Such states could manifest as single colour bound objects, or evolve from meson-baryon and meson-meson interactions, creating molecular like systems and re-scattering effects near production thresholds. Equivalent...
The investigation of heavy quarkonia can give insight into processes that occur during the evolution of the quark-gluon plasma and therefore allow conclusions about the properties of the medium. One advantage of the theoretical approaches is that due to the large masses of the heavy quarks it is possible to describe them non-relativistically. We choose a classical model to describe charm and...
The photo-production of vector mesons off the proton has long been established as an important tool to access the gluon content of the nucleon. In particular, the photo-production of J/$\psi$ near the threshold energy has been related to the Gravitational Form Factors of the gluons which provide information about the mass and the force distributions in the nucleon. In this talk, I will present...
QCD sum rule approach is a powerful tool to implement QCD dynamics into hadron and nuclear many-body physics even for finite density.
We applied the QCD sum rule approach to derive a nuclear charge symmetry breaking (CSB) energy density functional (EDF), which describes the Okamoto-Nolen-Shiffer anomaly successfully.
As the next step, we propose an approach to derive the charge independence...
In addition to conventional hadrons, such as baryons and mesons, quantum chromodynamics predict the existence of other hadronic states based on the principle of colour confinement. Among these, hybrid states are particularly intriguing. They arise from excitation in the gluonic field or, in a constituent approach, from the inclusion of a constituent gluon within the system. In recent years,...
We compute the vacuum energy density as a function of the quark condensate in the interacting instanton liquid model (IILM) and examine a pattern of dynamical chiral symmetry breaking from the behavior of the vacuum energy density at the origin. This evaluation is performed by using a numerical simulation of the IILM. We find that chiral symmetry is broken in the U(1)_A anomaly assisted way in...
Measuring Deeply Virtual Compton Scattering (DVCS) is crucial to the study of Generalised Parton Distributions (GPDs). GPDs provide a description in 3D of the position and momentum of quarks and gluons inside the nucleon, which is essential to understand how its global properties emerge.
The extraction of GPDs necessitates high precision measurements of multiple observables on a wide...
We discuss the flow harmonics or the elliptic and triangular flow of J/ψ, ψ(2S), and χc1(1P) mesons in heavy ion collisions. Starting from the investigation on transverse momentum distributions of those charmonium states, we calculate their elliptic and triangular flow when they are produced at the quark-hadron phase boundary by quark recombination. We show that the wave function distribution...
The formal concept of isospin has been introduced to explain the apparent exchange symmetry between neutrons and protons [1]. However, if the nuclear force were the same for protons and neutrons properties such as masses and excitation energies would depend only on the mass number A. Hence, in the absence of isospin-non-conserving effects, two isobaric analog states would be completely...
We present a simple holographic QCD model for nucleons and vector mesons. The model can be thought of a consistent embedding of soft wall models in Einstein-dilaton gravity and it leads to hadronic correlators compatible with QCD in the large N limit. We compare our results for the hadronic masses and decay constants against previous models and available experimental data.
Reference:...
We study the effect of a finite volume for pion-pion scattering over energy levels and physical
observables such as the phase-shift or pion mass. The method to determine the energy levels is done
using a finite set of cubic harmonics or the matrices which represents the Irreps properly, which
expands our Inverse Amplitude Method, (as well we apply the method already in the known...
QTRAJ is a computer code that simulates the propagation of quarkonium in the quark-gluon plasma (QGP) based on the quantum trajectories' algorithm. This algorithm solves a master equation in which the quarkonium is treated as an open quantum system (OQS). The specific master equation is obtained through the potential non-relativistic QCD (pNRQCD) approach, but so far has been restricted to the...
Last years have brought a breakthrough in the lattice calculations of x-dependent partonic distributions, such as generalized parton distributions (GPDs). The recent progress for the latter is related to the use of asymmetric frames of reference. This allows for simultaneous access to several values of the momentum transfer, significantly enhancing the prospects of fully mapping the...
The significance of finite temperature effects in nuclear dipole transitions is evident across various applications in nuclear physics and astrophysics [1-4]. To describe temperature effects in electromagnetic transitions, we developed a self-consistent finite temperature relativistic quasiparticle random phase approximation (FT-RQRPA) based on relativistic energy density functional with point...
The mass of the $\eta^{\prime}$ meson is notably large compared to other members of the light pseudoscalar meson nonet. The origin of the large mass is considered to be attributed to the axial U(1) anomaly and the spontaneous breaking of chiral symmetry in the QCD vacuum. In nuclear matter, various theoretical models predict a mass reduction of $\eta^{\prime}$ meson ranging from 37 to 150...
In this talk, an ab initio study of infinite nuclear matter is presented within a recently introduced Green's function approach based on the state-of-the-art algebraic diagrammatic construction (ADC) scheme [1-3].
The goal is, on the one hand, to show the power of the method, that allows to access not only the equation of state (EOS), but also single-particle properties such as the momentum...
Being able to deal with the most acurate methods to describe the $Q\bar Q$ evolution in a quark gluon plasma is a prerequisite to match the precise quarkonium measurements of all URHIC experiments. Following our recent work [1], we present exact numerical solutions in a one-dimensional setting of quantum master equations previously derived in [2].
We focus on the dynamics of a single heavy...
Ever wondered about why the 27 kilometer Large Hadron Collider was built and what scientists do with it? Then this is the talk for you! The large hadronic collider is the Swiss army knife of experiments, and investigates anything from new particles and forces to the birth of the universe. As one of the physicists who works with the enormous detectors that record the collisions of the Large...
Quantum Chromodynamics (QCD) predicts a deconfined state of quarks and gluons: Quark Gluon Plasma (QGP). Studying the transport and medium properties of QGP greatly deepens our understanding of the strong interaction. Heavy quarks created from the hard scatterings in heavy-ion collisions are golden probes of the medium, by providing insights into in-medium energy loss, diffusion behaviors and...
Driven by the need to have a QCD-based determination of the hadron spectrum, nuclear structure, and electroweak decays, the lattice QCD community has been making impressive progress towards studying two- and three-hadron scattering amplitudes. Being defined in a finite-Euclidean spacetime, the notion of scattering is absent within lattice QCD, and conceptually such studies are naively...
Recent advancements have facilitated the approximate computation of light-cone correlation functions in lattice QCD through the evaluation of their Euclidean counterparts. In this presentation, we will provide a brief overview of these significant developments that have direct implications for Generalized Parton Distributions.
The recently discovered abundance of exotic hadrons is rapidly expanding our understanding of the bound states allowed by QCD. However, basic questions about the structure of these new particles remain unanswered. Measurements of these exotic hadrons and their interactions with the QCD medium provides a new avenue to investigate their properties. Additionally, the production of hadrons with...
Authors: S. Glässel, V. Kireyeu, G. Coci, V. Voronyuk, M. Winn, J. Aichelin, C. Blume, and E. Bratkovskaya
We investigate the influence of the equation-of-state (EoS) of strongly interacting hadronic and partonic matter created in heavy-ion collisions on the light cluster and hypernuclei production within the Parton-Hadron-Quantum-Molecular Dynamics (PHQMD) microscopic transport approach...
The system of η and η′ offers a flavor-conserving laboratory to test the low-energy QCD and to search for new physics Beyond the Standard Model. The symmetry properties of QCD at low-energy, such as the chiral symmetry or the axial anomalies, are manifested in the decays of η and η′. Thus, a study of $\eta^{(\prime)}$ will yield light on our understanding of the origin and the dynamics of QCD...
Using the world’s largest samples of J/psi and psi(3686) events produced in e+e- annihilation, BESIII is uniquely positioned to study light hadrons in radiative and hadronic charmonium decays. In particular, exotic hadron candidates including multiquark states, hybrid mesons and glueballs can be studied in high detail. Recent highlights on the light exotics searches, including observation of...
The proposed Electron-Ion Collider (EIC) will utilize high-luminosity high-energy electron+proton ($e+p$) and electron+nucleus ($e+A$) collisions to solve several fundamental questions, which include searching for gluon saturation and studying the proton/nuclear structure. Due to their high masses ($M_{c,b} > \Lambda_{QCD}$), heavy quarks do not transfer into other quarks or gluons once they...
The ePIC experiment at the Electron-Ion Collider (EIC) includes a dual-radiator RICH (dRICH) detector for PID in the forward region. This is to provide hadron particle identification capability to the experiment for the in-depth investigation of the nucleon structure planned at the EIC, enabling in particular the study of Semi-Inclusive DIS (SIDIS) events. SIDIS events probe the confined...
We present results for dipion transitions between heavy quarkonium states of large principal quantum number for which the multipole expansion does not hold. We combine the QCD effective string theory with the Chiral Lagrangian in order to get the appropriate vertexes.
We extend the results to transitions for which the initial estate is a heavy quarkonium hybrid. We observe that the dipion...
A fixed-target experiment at LHC to measure directly the dipole moments of charm baryons is presented. The experimental approach is based on the phenomenon of spin precession for channeled particles in bent crystals and on the precise measurement of the charm baryon polarisation. The measurement of the magnetic moment of charm baryons would allow to determine the charm quark magnetic moment. A...
A precise description of pion-pion interactions at low energies is fundamental for many processes in hadronic physics. We present preliminary work, which introduces several improvements with respect to a previous dispersive analysis*. This includes a refined treatment of inelasticities, the introduction of G-waves, the study of Forward Dispersion Relations (FDRs) up to 1.6 GeV, and data...
NA61/SHINE is a multipurpose fixed-target experiment located at CERN SPS. One of its main goals is to study the phase diagram of strongly interacting matter. For this purpose, a unique two-dimensional scan in beam momentum 13A-150(8)A GeV/c and the system size including p+p, p+Pb, Be+Be, Ar+Sc, Xe+La, and Pb+Pb collisions was performed. The main goal of the strong interaction program is to...
The electromagnetic form factor of the charged pion encodes relevant information in hadron dynamics. On the one hand, its phase is related (modulo isospin-breaking corrections) to the universal $\pi\pi$ $P$-wave phase shift, that appears in a variety of hadronic processes. On the other hand, it appears as an essential input to describe hadronic electromagnetic interactions when employing...
Presented here is a theoretical model designed to investigate double pion photoproduction, within the photon energy range of 3.0 to 3.8 GeV and momentum transfer range of $0.4<-t<1.0$ GeV$^2$. This model integrates contributions from resonances such as the $\rho(770)$, as well as the primary background from the Deck mechanism.
Utilizing the Regge formalism and incorporating the established...
The study of strongly interacting matter under extreme conditions is one of the most important topics in the exploration of Quantum
Chromodynamics (QCD).
In this talk, we highlight new measurements by HADES, the High-Acceptance Dielectron Spectrometer located at the SIS18 at GSI in Darmstadt, which is currently the only experimental setup with the unique ability to measure rare and...
Electromagnetic form factors, which are accessible via elastic electron scattering, encapsulate information on the charge and current structure inside the nucleons. The data on the nucleon form factors allows flavour separation analysis, for which early measurements have provided striking results indicating to a di-quark component in a nucleon. Form factors also provide important constraints...
This presentation will discuss recent experimental discoveries in the realm of charmonium decays, containing four independent measurements at BESIII. 1) The observation of the ψ(3686) → 3ϕ decay. This observation sheds light on the rare decay process of the ψ(3686) resonance into three φ mesons, providing valuable insights into the dynamics of charmonium decays. No significant structure is...
The sensitivity of the rare decays $\eta\to\pi^{0}\gamma\gamma$ and
$\phi\to\pi^{0}\eta\gamma$ to signatures of a leptophobic $B$ boson in the MeV-GeV mass range is analyzed in this talk.
By adding an explicit $B$-boson resonance exchange to the Standard Model contributions from vector and scalar meson exchanges,
and employing experimental data for the associated branching ratios
and...
Despite the f0(980) hadron having been discovered half a century ago, the question about its quark content has not been settled: it might be an ordinary quark-antiquark meson, a tetraquark exotic state, a kaon-antikaon molecule, or a quark-antiquark-gluon hybrid. We report strong evidence that the f0(980) state is an ordinary quark-antiquark meson, inferred from the scaling of elliptic...
One of the earliest predictions of Quantum Chromodynamics (QCD) is the existence of color singlet pure-gauge states known as glueballs. However, despite this anticipation, consensus on their theoretical properties and experimental evidence remains elusive. Two-gluon glueball states have been quite abundantly explored both theoretically and experimentally. One may cite, for example, on the...
The progress towards the direct measurement of electric and magnetic dipole moments of Lambda baryons at LHCb is presented. In addition, the measurement of magnetic dipole moments for particles and antiparticles would allow a test of the CPT symmetry. The experimental technique is based on the spin precession of Lambda baryons in the dipole magnet of the LHCb tracking system. Lambda baryons...
The last decade has seen a wealth of discoveries of new hadronic states with heavy quarks, many of which are outside the scope of the naive quark model of conventional mesons and baryons. The LHCb experiment, designed to research heavy flavor hadrons in $pp$ collisions, is especially well suited to investigate the nature of these states. An under-exploited source of hadronic resonances are...
This abstract presents a thorough analysis of the φ → 3π decay amplitude, including a study of its behavior using different phase shift parametrizations. Based on recent experimental results, we delve into the intricacies of this decay process and also explore the φπ0 transition form factor. By employing the Khuri–Treiman equations approach, we establish a strong agreement between the...
We study the potential of X(3872) at finite temperature in the Born-Oppenheimer approximation under the assumption that it is a tetraquark. We argue that, at large number of colors, it is a good approximation to assume that the potential consists in a real part plus a constant imaginary term. The real part is then computed adapting an approach by Rothkopf and Lafferty and using as input...
The nontrivial quark structure of light scalar mesons f0(500), f0(980) and a0(980) remains controversial for many years. In passed years, BESIII studied them via several semileptonic D decays (D0->a0(980)- e+nu, D+ -> a0(980)0 e+nu, Ds+ -> a0(980)0 e+nu, D+ -> f0(500)/f0(980)e+nu, D+ -> f0(500)mu+nu, Ds+ -> f0(500)/f0(980)e+nu). Especially, the measurement of D -> f0/a0 form factor could shed...
The $D^{+} \to K_s^0 \pi^{+} \eta$ reaction was recently measured by the BESIII collaboration [1]. The reaction is actually $D^{+} \to \bar{K}^0 \pi^{+} \eta$, with the $\bar{K}^0$ observed as a $K_s^0$ state.
We study the $D^{+} \to \bar{K}^0 \pi^{+} \eta$ reaction, where the $a_0(980)$ excitation plays a dominant role. We consider mechanisms of external and internal emission at the quark...
Heavy-ion collision experiments are a valuable tool for studying nuclear properties. Accurately modeling entropy production at the initial collision time and subsequent collective evolution is crucial to connect the nuclear structure to heavy-ion measurements. In this talk, we argue that, based on experimental data, it is reasonable to assume scale-invariance at the initial state, meaning the...
In recent years, many new jet substructure observables have been studied, with particular attention given to those that can be calculated by perturbative QCD. N-point energy correlators are currently attracting both theoretical and experimental interest. The energy-energy correlators (EEC), or two-point correlator, which emphasize the angular structure of the energy flow within jets, allow for...
The study of single-particle structure in light neutron-rich systems has led to discoveries of dramatic changes which are otherwise gradual near stability, leading to the weakening and appearance of shell closures. For example, the disappearance of N = 20 and emergence of N = 16 [1, 2] as well the emergence of N = 32, 34 in calcium isotopes [3]. Pronounced trends have also been observed in...
The new generation of deeply virtual exclusive experiments planned at Jefferson Lab and the EIC, in conjunction with other laboratories worldwide, purport to measure and image the internal structure of hadronic systems. To fully capitalize on the data emerging from these experiments, our collaboration has focused on combining the analysis of the experimental information with ab initio...
Modern experimental facilities, new theoretical techniques for the continuum bound-state problem and progress with lattice-regularized QCD may have provided indications that soft quark+quark (diquark) correlations play a crucial role in hadron physics. For example, theory indicates that the appearance of such correlations is a necessary consequence of dynamical chiral symmetry breaking, viz. a...
Exquisite experimental measurements over the last two decades have allowed us to precisely extract fundamental parameters of the Standard Model and
to uncover new physics, in the form of nonzero neutrino masses.
These remarkable advances have been made possible by the theoretical foundations in hadronic physics. I will illustrate this on a number of specific examples, including lepton...
Nuclear matter at subsaturation densities is expected to be inhomogeneous, owing to the existence of many-body correlations, which constitutes an essential feature for the construction of a reliable equation of state. A first emergent phenomenon related to this aspect is the fragmentation process, experimentally observed in heavy-ion collisions at intermediate energies as the result of...
The dilemma between molecular states and compact quark states is the subject of a continuous debate in hadron physics.In this talk, based on our recent two works [PLB846,138200 and PRD108,114017] we address the issue of the compositeness of hadronic states for Tcc(3875) in the single channel calculation and also an extension to X(3872) in the coupled channel calcualtion. We develop the general...
In this work, we investigate the hadron interactions using the three-quark potential in a constituent quark model. Three-quark potentials have only been studied for simple cases because it is difficult to calculate the three-color interaction matrix and determine the radial dependence of potential. In the case of a multiquark system, the three-quark color matrix can be calculated using the...
We present a new coherent jet energy loss model for heavy-ion collisions. It is implemented as a Monte Carlo perturbative final-state parton shower followed by elastic and radiative collisions with the medium constituents. Coherency is achieved by starting with trial gluons that act as field dressing of the initial jet parton. These are formed according to a Gunion-Bertsch seed. The QCD...
We compute for the first time the τ data-driven Euclidean windows for the hadronic vacuum polarization contribution to the muon g−2. We show that τ-based results agree with the available lattice window evaluations and with the full result. On the intermediate window, where all lattice evaluations are rather precise and agree, τ-based results are compatible with them. This is particularly...
The study of reactions involving weakly-bound exotic nuclei is an active field due to advances in radioactive beam facilities. Many of these nuclei can be approximately described by a model consisting of an inert core and one or more valence nucleons. For some of these nuclei, the quadrupole deformation is especially relevant and should be included in the structure models. This is the case of...
In this study, we employ Bayesian statistical methods to analyze nucleon-nucleon scattering data within the framework of pionless effective field theory. The Bayesian analysis facilitates the quantification of uncertainties and the incorporation of prior theoretical knowledge, thereby enhancing the interpretability and reliability of the model parameters. By applying this methodology to...
We face the inverse problem of obtaining the interaction between coupled channels from the correlation
functions of the the 𝐷0𝐾+, 𝐷+𝐾0, and 𝐷+𝑠 𝜂 channels,from where the 𝐷∗𝑠0(2317) state emerges. We use synthetic data extracted from an interaction model based on the local hidden gauge approach and find that the inverse problem can determine the existence of a bound state of the system with a...
Shortly after the beginning of the LHC heavy ion program, the CMS Collaboration reported the observation of stronger suppressions of the excited $\Upsilon$ states compared to the lower $\Upsilon\mathrm{(1S)}$ state, first in lead-lead (PbPb) and then in proton-lead (pPb) collisions. Such feature, anticipated in the former as a signature of the presence of a quark-gluon plasma, was however...
We review the radiative corrections to the tau -> P (P) nu_tau [gamma] decays and their implications for several SM tests: lepton universality, CKM unitarity and non-standard interactions.
We study the shape coexistence in the nucleus $^{28}$Si with the nuclear shell model using numerical diagonalizations complemented with variational calculations based on the projected generator-coordinate method. The calculated electric quadrupole transitions and moments and an analysis of the collective wavefunctions indicate that the standard USDB interaction in the $sd$ shell describes well...
Systematic studies of jet substructure offer precision tests of quantum chromodynamics (QCD) in vacuum as well as at the large particle densities and high temperatures of the quark-gluon plasma (QGP) produced in heavy-ion collisions. The jet invariant mass is a canonical jet substructure observable which has been broadly studied for decades, both experimentally and theoretically, to qualify...
Rare kaon decays are among the most sensitive probes of both heavy and light new physics beyond the Standard Model description thanks to high precision of the Standard Model predictions, availability of very large datasets, and the relatively simple decay topologies. The NA62 experiment at CERN is a multi-purpose high-intensity kaon decay experiment, and carries out a broad rare-decay and...
The idea of studying nuclear physics directly from the degrees of freedom of the Standard Model, quarks and gluons, has been long sought in the physics community. During the last few decades, the numerical method called lattice QCD has been able to compute the simplest quantities, such as the hadron masses, directly from first principles. When trying to address multibaryon systems, more...
In quantum mechanics the coupling of a particle’s velocity with its own spin is at the origin of the spin-orbit effect that creates many fundamental phenomena in mesoscopic systems. In nuclear physics, a sizeable spin-orbit interaction, that breaks energy levels with the same
orbital momentum (l) but different spin value (s) apart, is responsible for the observed shell structure and generates...
We examine the compatibility of the different data sets of e^+e^- -> pi^+ pi^- and tau^- -> pi^- pi^0 nu_tau accounting for the required isospin-breaking between both sources of input to a_mu^{HVP,LO}|_{pipi}, which is responsible for the current conundrum in the data-based SM prediction of a_mu.
Research on hypernuclei plays an essential role in answering how the hierarchy of nuclei is constructed from quarks. We are going to review the recent achievements in hypernuclear programs in J-PARC. One of the recent achievements is the realization of an accurate hyperon-nucleon scattering experiment. The differential cross sections of the Σ+p, Σ−p elastic scatterings and Σ−p → Λn inelastic...
Genuine three-body forces in nuclear physics absorb all the effects which can not be described by two-body interactions in three-, four-.. body systems and are necessary ingredients in the description of nuclear binding energies. For hyperons and nucleons such forces have never been measured directly since scattering experiments are difficult with unstable hyperons and since the data-base of...
The scientific foundation for the Electron-Ion Collider (EIC) was built over two decades. The EIC will be sited at Brookhaven National Lab and constructed in partnership with Jefferson Lab. The EIC will have a versatile range of beam energies, polarizations, and ion species, as well as high luminosity, to precisely image quarks, gluons, and their interactions in protons and complex atomic...
