TL;DR
This paper reviews the HERMES experiment's results on Deeply Virtual Compton Scattering, which help to understand the nucleon's internal structure and quark angular momentum through measurements of asymmetries related to Generalised Parton Distributions.
Contribution
It provides a comprehensive overview of HERMES DVCS results and demonstrates how these measurements constrain the models of Generalised Parton Distributions.
Findings
HERMES has the most diverse DVCS results among experiments.
Asymmetry measurements improve understanding of GPDs.
Results contribute to knowledge of quark angular momentum.
Abstract
The study of Generalised Parton Distributions (GPDs) promises to provide new knowl- edge of the structure of the nucleon, including, most notably, access to the total angular momentum of quarks within the nucleon. It can be difficult to ascertain new information on the distributions, but amongst all the exclusive processes that can provide access, Deeply Virtual Compton Scatter- ing (DVCS) is relatively simple and experimentally accessible. The HERMES collaboration has the most diverse results pertaining to DVCS of any experiment, extracting asymmetries in the azimuthal distribution of produced photons according to both beam helicity and charge and target spin state. In this talk, we provide an overview of the HERMES DVCS result catalogue and explain how the results are used to improve constraints on the underlying GPDs.
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Taxonomy
TopicsQuantum Chromodynamics and Particle Interactions · Particle physics theoretical and experimental studies · Nuclear physics research studies