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Pré-Publication, Document De Travail Année : 2023

Low and moderate $x$ gluon contribution to exclusive Compton scattering processes

Renaud Boussarie
Yacine Mehtar-Tani
  • Fonction : Auteur

Résumé

We revisit the high energy semi-classical description of the exclusive processes DVCS, TCS, and Double DVCS by explicitly keeping track of the Feynman $x$ dependence in both the hard and the hadronic matrix elements. This is achieved by a modification of the standard shock wave approximation to derive the effective Feynman rules, which leads to a generic expression on which we then perform a partial twist expansion to get rid of quantities suppressed by the proper physical scales. We obtain a compact factorized master formula that can be used to investigate the Bjorken limit at leading twist. In particular, we recover the full one-loop result in the collinear limit for pure gluon exchange with the target. Finally, we discuss the subtleties in taking the simultaneous collinear and small $x$ limit.

Dates et versions

hal-04237634 , version 1 (11-10-2023)

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Renaud Boussarie, Yacine Mehtar-Tani. Low and moderate $x$ gluon contribution to exclusive Compton scattering processes. 2023. ⟨hal-04237634⟩
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