Speaker
Description
The mechanical properties of the proton are encoded in the proton’s matrix element of the energy-momentum tensor (EMT), and are expressed in the gravitational form factors (GFF) that represent the distribution of mass, shear stress, and angular momentum inside the proton. Another global quantity that can be obtained is the mechanical radius of the proton. The GFF can be directly probed only through interaction with spin-2 gravitons, a highly impractical proposition. However, the GFF can be probed indirectly through processes such as deeply virtual Compton scattering and time-like Compton scattering that involve spin-2 interactions due to the presence of two photons, one virtual photon (space-like or time-like), and one real photon coupling to the same quark in the proton. The current status will be briefly reviewed, and expected results on DVCS and TCS data from JLab@12 GeV will be discussed. A brief outlook at the EIC capabilities will be given.
