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 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 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.
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...
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...
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...
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...
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...
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.
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...
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 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 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...
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...
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...
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...
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...
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...
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...
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...
