Work

Low and moderate x gluon contribution to exclusive Compton scattering processes

Year: 2024

Type: article

Abstract: A bstract 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.

Source: Journal of High Energy Physics

DOI: 10.1007/jhep10(2024)056

Authors: R. Boussarie, Y. Mehtar-Tani

Institutions: Centre National de la Recherche Scientifique, École Polytechnique, Centre de Physique Théorique, Institut Polytechnique de Paris, Brookhaven National Laboratory

Language: English

Topic: Quantum Chromodynamics and Particle Interactions

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond

Funders: U.S. Department of Energy, Laboratory Directed Research and Development

Awards: G241279073, G4920325777, G5765906131