Deeply Virtual Compton Scattering with a Positron Beam

被引：0
作者：
Girod, Francois-Xavier [1 ]
Elouadrhiri, Latifa [1 ]
Burkert, Volker D. [1 ]
机构：
[1] Thomas Jeson Natl Accelerator Facil, Newport News, VA 23606 USA
来源：
INTERNATIONAL WORKSHOP ON PHYSICS WITH POSITRONS AT JEFFERSON LAB | 2018年 / 1970卷
关键词：
DISTRIBUTIONS; NUCLEON;
D O I：
10.1063/1.5040199
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
The hard electroproduction of a photon off a hadron in the Bjorken regime, Deeply Virtual Compton Scattering, unravels three-dimensional information on the partonic structure of the hadron. The imaginary part of the amplitude is more particularly sensitive to the spatial distribution of quarks as functions of the light cone momentum fraction. On the other hand, the real part of the amplitude is less constrained experimentally, and provides access to the D-term. Here we present preliminary results for the extraction of the D-term from unpolarized cross-sections and beam spin asymmetries measured with the CEBAF Large Acceptance Spectrometer at 6 GeV. We discuss some aspects of the associated physics interpretation, and give prospects for future measurements. The availability of a Positron beam at Jefferson Lab will provide access to the Beam Charge Asymmetry for this reaction, which will crucially enable us to keep under control the systematical and model uncertainties in this framework.
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