Higher-order kinematical effects in deeply virtual Compton scattering

Guo, Yuxun; Ji, Xiangdong; Shiells, Kyle

doi:10.1007/jhep12(2021)103

Higher-order kinematical effects in deeply virtual Compton scattering

Journal Article · Thu Dec 16 00:00:00 EST 2021 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/jhep12(2021)103· OSTI ID:1976595

^[1]; Ji, Xiangdong ^[1]; Shiells, Kyle ^[2]

University of Maryland, College Park, MD (United States); Southeastern Universities Research Associations (SURA), Washington, DC (United States). Center for Nuclear Femtography
Southeastern Universities Research Associations (SURA), Washington, DC (United States). Center for Nuclear Femtography

We study the deeply virtual Compton scattering cross-section in twist-two generalized parton distribution (GPD) approximation, and show that different choices of light-cone vectors and gauges for the final photon polarization will lead to different higher-order kinematical corrections to the cross-section formula. The choice of light-cone vectors affects kinematic corrections at the twist-three level, accounting for the differences between the cross-section formulas in the literature. On the other hand, kinematical corrections from higher-twist GPDs should eliminate the light-cone dependence at twist three. Those light-cone dependencies are studied systematically at JLab 12 GeV and future EIC kinematics. They serve as the intrinsic systematic uncertainties in extracting the Compton form factors through the cross-section formula. More importantly, they are also necessary for understanding cross-section measurements with higher-twist precision and to reconstruct higher-order Compton form factors.

View Accepted Manuscript (DOE)

Research Organization:: University of Maryland, College Park, MD (United States)

Sponsoring Organization:: Center for Nuclear Femtography; Southeastern Universities Research Association; USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC0020682

OSTI ID:: 1976595

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 12 Vol. 2021; ISSN 1029-8479

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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