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arXiv · 2212.07657

Timelike Compton scattering in ultraperipheral $pPb$ collisions

Ya-Ping Xie·V. P. Goncalves
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Abstract

The study of exclusive processes in photon - induced interactions allow us to probe the generalized parton distributions (GPDs), which provide information about the 3 dimensional description of the quark and gluon content of hadrons. In this paper we investigate the timelike Compton scattering (TCS) in ultraperipheral $pPb$ collisions at the LHC. Such process is characterized by the exclusive dilepton production through the subprocess $\gamma p \rightarrow \gamma^*p \rightarrow l^+ l^- p$, with the real photon in the initial state being emitted by the nucleus. Assuming a given model for the GPDs, the TCS differential cross section is estimated as well the contribution associated to the interference between the TCS and Bethe - Heitler (BH) amplitudes. Predictions for the TCS, BH and interference contributions are presented considering the kinematical range covered by the LHC detectors.

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Ya-Ping Xie, V. P. Goncalves. 2022-12-15. Timelike Compton scattering in ultraperipheral $pPb$ collisions. https://doi.org/10.1016/j.physletb.2023.137762

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