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 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,...
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...
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...
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...
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...
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...
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.
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...
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.
