Deeply Virtual Compton Scattering at Future Electron-Ion Colliders

TL;DR

This paper explores the potential of future Electron-Ion Colliders to study the internal structure of hadrons through Deeply Virtual Compton Scattering, using simulations to assess experimental feasibility and constraints on quark angular momentum.

Contribution

It provides a detailed simulation framework for DVCS at future colliders and demonstrates how asymmetry measurements can constrain quark angular momentum in protons.

Findings

Feasibility of DVCS experiments at EicC and EIC shown through simulations.

Model-dependent constraints on up and down quark angular momentum obtained.

Comparison with HERMES method validates the simulation approach.

Abstract

The study of hadronic structure has been carried out for many years. Generalized parton distribution functions (GPDs) give broad information on the internal structure of hadrons. Combining GPDs and high-energy scattering experiments, we expect yielding three-dimensional physical quantities from experiments. Deeply Virtual Compton Scattering (DVCS) process is a powerful tool to study 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 $3 \sim 5$ GeV polarized electrons on $12 \sim 25$ GeV polarized protons, with luminosity up to $1 \sim 2 \times 10^{33}$cm$^{-2}$s$^{-1}$. EIC will be constructed in coming years, which will cover the variable c.m. energies from 30 to 50 GeV, with the luminosity about $10^{33} \sim 10^{34}$cm$^{-2}$s$^{-1}$. 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.