Lorentz invariance violation (LV) can be examined through the time delay between high-energy and low-energy photons in gamma-ray bursts (GRBs). Previous studies determined the Lorentz violation energy scale as $E_{\rm LV} \simeq 3.60 \times 10^{17}$~GeV using Fermi Gamma-ray Space Telescope (FGST) data. We update the time delay model and reaffirm these findings with new observations.
New method is presented for measuring the radius of the deuteron that can help to resolve the current discrepancies between muon-deuteron, electron-deuteron spectroscopic as well as electron-deuteron scattering measurements.
The MUon proton Scattering Experiment (MUSE) at the Paul Scherrer Institute (PSI) was motivated by the proton radius puzzle. We obtain simultaneous high-precision measurements of elastic electron-proton and muon-proton scattering, alternating between positively and negatively charged leptons. The experiment will test lepton universality by comparing electron to muon scattering, will determine...
The form factors of the energy-momentum tensor give information on the pressure, energy and angular momentum distributions among quark and gluons inside the proton. We discuss the distributions of pressure and angular momentum inside a quark state dressed with one gluon.
The SPD experiment will operate at one of the two interaction points of the NICA collider facility at JINR. The collider will provide polarized proton and deuteron beams for $pp$ and $dd$ collisions with the c.m.s. energy up to $\sqrt{s} = 27$ GeV and $\sqrt{s_{NN}} = 13.5$ GeV, respectively. The primary goal of the experiment is to study the polarized and unpolarized gluon structure of proton...
