Hall C Document 1146-v1

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Single and Double Spin asymmetries in Timelike Compton Scattering for a transversely polarized proton and a circularly polarized photon beam

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Marie Boer
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Marie Boer
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12 Aug 2021, 16:49
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12 Aug 2021, 16:49
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12 Aug 2021, 16:49
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Generalized Parton Distributions (GPD) are functions that correlate the transverse distribution of partons with their longitudinal momenta. GPDs can be interpreted tomographically as “3D images” of nucleons. They can be accessed in hard exclusive processes, such as Timelike Compton Scattering (TCS). This process is measured in the reaction γ(P) → γ∗(p) → e+e−(P) which is the photoproduction of a lepton pair at high invariant mass where the virtual photon scatters off a quark, and interferes with the Bethe-Heitler (BH) process. The spacelikeequivalent of TCS, Deeply Virtual Compton Scattering (DVCS), has been widely studied over the past two decades and provided data to parametrize GPD models; however, there is a lack of experimental data on some GPDs such as GPD E. GPD E contains information about the nucleon polarization and parton angular. We analyzed data in the context of the development of an experiment at JLab Hall C aimed at extracting the GPDs H and E from TCS. We will discuss our goals, our analysis method, and present projections of TCS transversely polarized spin asymmetries for both a circularly polarized and unpolarized beam and their sensitivities to the parametrization of the GPD E.
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Author = Brannon Semp (Virginia Tech undergraduate student)
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