Neutron contribution to nuclear deeply virtual Compton scattering asymmetries

2008/01/21 by V. Guzey · 2 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph #nucl-th

paper · pdf · doi:10.1103/physrevc.78.025211

published as Phys.Rev.C78:025211,2008 · 24 pages, 7 figures

arxiv created 2008/01/21 · openalex publication_date 2008/08/19 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

Using a simple model for nuclear generalized parton distributions (GPDs), we study the role of the neutron contribution to nuclear deeply virtual Compton scattering (DVCS) observables. As an example, we use the beam-spin asymmetry A_LU^A measured in coherent and incoherent DVCS on a wide range of nuclear targets in the HERMES and JLab kinematics. We find that at small values of the momentum transfer t,A_LU^A is dominated by the coherent-enriched contribution, which enhances A_LU^A compared to the free proton asymmetry A_LU^p,A_LU^A(\ensuremathφ)/A_LU^p(\ensuremathφ)=1.8\ensuremath-2.2. At large values of t, the nuclear asymmetry is dominated by the incoherent contribution and A_LU^A/(\ensuremathφ)A_LU^p(\ensuremathφ)=0.66\ensuremath-0.74. The deviation of A_LU^A(\ensuremathφ)/A_LU^p(\ensuremathφ) from unity at large t is a result of the neutron contribution, which gives a possibility to constrain neutron GPDs in incoherent nuclear DVCS. A similar trend is expected for other DVCS asymmetries.

Cited by

• Conventional nuclear effects on generalized parton distributions of trinucleons
• Can one measure timelike Compton scattering at LHC?