Speaker
Description
Generalized Parton Distributions (GPDs) play a crucial role in advancing our understanding of the nucleon’s internal structure. They offer a unified framework to access the total spin of the nucleon, its mechanical properties, and a three-dimensional tomography of its constituents. Timelike Compton Scattering (TCS) provides a valuable probe of GPDs, particularly enabling access to the real part of the GPD H and offering constraints on the D-term. However, TCS is a rare process, and its signal is often overwhelmed by the Bethe-Heitler (BH) background. To isolate the TCS contribution, we analyze the interference between TCS and BH. By measuring polarization-dependent cross-section asymmetries, we can isolate the interference term and perform fits to extract GPD H parameters, shedding light on the nucleon’s internal dynamics.
The current analysis focuses on selecting clean TCS events by suppressing background contributions, particularly in the invariant mass M (e+e−) region of [1.2, 2.5]GeV, where the contribution from resonant and non-exclusive processes becomes significant.
