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PoS - Proceedings of Science
Volume 346 - 23rd International Spin Physics Symposium (SPIN2018) - Parallel Session: 3D Structure of the Nucleon: GPDs and Form Factors (C. Lorce and S. Niccolai)
Status of the experimental studies on DVMP and transversity GPDs
V. Kubarovsky* and  On behalf of the CLAS Collaboration
Full text: pdf
Pre-published on: August 19, 2019
Published on: August 23, 2019
Abstract
The cross section of the exclusive π0 and η electroproduction reaction epepπ0/η was measured at Jefferson Lab with a 5.75-GeV electron beam and the CLAS detector. Differential cross sections d4σ/dtdQ2dxBdϕ and structure functions σU=σT+ϵσL,σTT and σLT, as functions of t were obtained over a wide range of Q2 and xB. At low t, both π0 and η are described reasonably well by Generalized Parton Distributions (GPDs) model in which chiral-odd transversity GPDs are dominant. Generalized form factors of the transversity GPDs Hπ,ηT and ˉEπ,ηT were directly extracted from the experimental observables. The combined π0 and η data opens the way for the flavor decomposition of the transversity GPDs. The first ever demonstration of this decomposition was done for the transversity GPDs HT and ˉET. GPD ˉET is connected with the density of the polarized quarks in an unpolarized nucleon in the impact parameter space. The spin density of polarized u and d-quarks was evaluated for different values of Feynman x from the GPD model tuned to described the experimental data.
DOI: https://doi.org/10.22323/1.346.0075
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