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arxiv 2403.02587 v1 pith:MUT4OCZT submitted 2024-03-05 nucl-ex

Future measurements of TCS at JLab Hall C

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keywords beamgpdsaccessingcomptondiscusshalljlabpolarized
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Generalized parton Distributions (GPDs) are important functions to understand the three dimensional structure of the nucleon. Deeply Virtual Compton Scattering is one of the reaction accessing GPDs, and has been measured for the past $\sim$20 years. However, to move forward, we need to look for other reactions, such as Timelike Compton Scattering (TCS), its "time-reversal" equivalent. Indeed, accessing GPDs from both DVCS and TCS independently will allow us, for instance, to study their universality. Any assesment on GPD's universality would be a milestone in our field. In this article we discuss our preliminary studies on the feasibility of measuring unpolarized and beam polarized cross sections and beam spin asymmetry for TCS in the dilepton photoproduction reaction. For that purpose, we use a polarized photon beam and an unpolarized target at JLab Hall C. We will discuss our Geant4 simulations, with a dedicated detector setup along with the use of the SBS magnet for separating outgoing $e^{+}$, $e^{-}$ pairs.

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