Twist-three cross-sections in deeply virtual Compton scattering

Guo, Yuxun; Ji, Xiangdong; Kriesten, Brandon; Shiells, Kyle

doi:10.1007/jhep06(2022)096

Twist-three cross-sections in deeply virtual Compton scattering

Journal Article · Fri Jun 17 00:00:00 EDT 2022 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/jhep06(2022)096· OSTI ID:1976489

^[1]; Ji, Xiangdong ^[2]; Kriesten, Brandon ^[3]; Shiells, Kyle ^[3]

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

We study the deeply virtual Compton scattering process with both twist-two and twist-three Compton form factors and present our cross-sections formulas with all polarization configurations. While the twist-three contributions are generally assumed to be negligible in the literature due to the kinematical suppression, we compare them with the twist-two ones at typical JLab 6 GeV and 12 GeV kinematics as well as EIC kinematics and show their kinematical suppression explicitly, justifying the leading-twist approximation made in the literature. In addition, we also estimate the twist-three Compton form factors using Wandzura-Wilczek relations and inputs of twist-two generalized parton distributions based on a reggeized spectator model. With those estimated Compton form factors, we analyze the kinematical behavior of twist-two and twist-three cross-sections in a wide range of kinematics, and discuss the optimal regions for separating the leading-twist effects from the higher-twist ones.

View Accepted Manuscript (DOE)

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

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

Grant/Contract Number:: SC0020682

OSTI ID:: 1976489

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 6 Vol. 2022; ISSN 1029-8479

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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