Deeply virtual Compton scattering on longitudinally polarized protons and neutrons at CLAS

TL;DR

This study reports on measurements of deeply virtual Compton scattering (DVCS) on polarized protons and neutrons at Jefferson Lab, providing insights into their internal structure through asymmetry analyses linked to Generalized Parton Distributions.

Contribution

It presents the first measurements of target-spin and beam-target asymmetries for proton DVCS and preliminary neutron DVCS data using polarized targets and a high-energy electron beam.

Findings

Target-spin asymmetries for proton DVCS measured.

Double asymmetries for proton DVCS analyzed.

Initial neutron DVCS asymmetry results obtained.

Abstract

This paper focuses on a measurement of deeply virtual Compton scattering (DVCS) performed at Jefferson Lab using a nearly-6-GeV polarized electron beam, two longitudinally polarized (via DNP) solid targets of protons (NH3) and deuterons (ND3) and the CEBAF Large Acceptance Spectrometer. Here, preliminary results for target-spin asymmetries and double (beam-target) asymmetries for proton DVCS, as well as a very preliminary extraction of beam-spin asymmetry for neutron DVCS, are presented and linked to Generalized Parton Distributions.