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Prospects for GPDs extraction with Double DVCS

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arxiv 2304.03704 v1 pith:K3F5I2X4 submitted 2023-04-07 hep-ph hep-exnucl-exnucl-th

Prospects for GPDs extraction with Double DVCS

classification hep-ph hep-exnucl-exnucl-th
keywords dvcsddvcscomptondeeplydoublegpdsprocessvirtual
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Double deeply virtual Compton scattering (DDVCS) is the process where an electron scatters off a nucleon and produces a lepton pair. The main advantage of this process in contrast with deeply virtual and timelike Compton scatterings (DVCS and TCS) is the possibility of directly measuring GPDs for $x\neq\pm\xi$ at leading order in $\alpha_s$ (LO). We present a new calculation of the DDVCS amplitude based on the methods developed by R. Kleiss and W. J. Stirling in the 1980s. These techniques produce expressions for amplitudes that are perfectly suited for implementation in numerical simulations. Via the PARTONS software, the correctness of this new formulation has been tested by comparing the DVCS and TCS limits of DDVCS with independent calculations of DVCS and TCS.

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