Deeply virtual compton scattering at future electron-ion colliders

Gang Xie; Wei Kou; Qiang Fu; Zhenyu Ye; Xurong Chen

doi:10.1140/epjc/s10052-023-12065-x

2024 Impact factor 4.8

Particles and Fields

Open Access

Eur. Phys. J. C (2023) 83: 900
https://doi.org/10.1140/epjc/s10052-023-12065-x

Regular Article - Theoretical Physics

Deeply virtual compton scattering at future electron-ion colliders

Gang Xie¹^,2, Wei Kou¹^,2, Qiang Fu¹^,2, Zhenyu Ye³^d and Xurong Chen¹^,2^e

¹ Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, China
² School of Nuclear Science and Technology, University of Chinese Academy of Sciences, 100049, Beijing, China
³ Department of Physics, University of Illinois, 60607, Chicago, IL, USA

^d yezhenyu@uic.edu
^e xchen@impcas.ac.cn

Received: 7 June 2023
Accepted: 24 September 2023
Published online: 6 October 2023

Abstract

The study of hadronic structure has been carried out for many years. Generalized parton distribution functions (GPDs) provide broad information on the internal structure of hadrons. Combining GPDs and high-energy scattering experiments, we expect yielding three-dimensional physical quantities from experiments. The Deeply Virtual Compton Scattering (DVCS) process is a powerful tool for studying GPDs. It is one of the important experiments of Electron Ion Collider (EIC) and Electron ion collider at China (EicC) in the future. In the initial stage, the proposed EicC will have polarized electrons with energies of $3 \sim 5$ $3 \sim 5$ GeV colliding with polarized protons with energies of $12 \sim 25$ $12 \sim 25$ GeV, with luminosity up to $1 \sim 2 \times 10^{33}$ $1 \sim 2 \times 10^{33}$ cm $^{- 2}$ $^{-2}$ s $^{- 1}$ $^{-1}$ . EIC, which will be constructed in the coming years, will cover center-of-mass energies ranging from 30 to 50 GeV, with a luminosity of about $10^{33} \sim 10^{34}$ $10^{33} \sim 10^{34}$ cm $^{- 2}$ $^{-2}$ s $^{- 1}$ $^{-1}$ . In this work, we present a detailed simulation of DVCS to study the feasibility of experiments at EicC and EIC. Referring the method used by HERMES Collaboration, and comparing the model calculations with pseudo data of asymmetries attributed to the DVCS, we obtained a model-dependent constraint on the total angular momentum of up and down quarks in the proton.

© The Author(s) 2023

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