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Title: Status of the experimental studies on DVMP and transversity GPDs

Abstract

The cross section of the exclusive $$\pi^0$$ and $$\eta$$ electroproduction reaction $$ep\to e^\prime p^\prime \pi^0/\eta$$ was measured at Jefferson Lab with a 5.75-GeV electron beam and the CLAS detector. Differential cross sections $$d^4\sigma/dtdQ^2dx_Bd\phi$$ and structure functions $$\sigma_U = \sigma_T+\epsilon\sigma_L, \sigma_{TT}$$ and $$\sigma_{LT}$$, as functions of $t$ were obtained over a wide range of $Q^2$ and $$x_B$$. At low $t$, both $$\pi^0$$ and $$\eta$$ are described reasonably well by Generalized Parton Distributions (GPDs) in which chiral-odd transversity GPDs are dominant. Generalized form factors of the transversity GPDs $$\langle H_T \rangle^{\pi,\eta}$$ and $$\langle \bar{E}_T \rangle^{\pi,\eta}$$ were directly extracted from the experimental observables. The combined $$\pi^0$$ and $$\eta$$ 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 $$H_T$$ and $$\bar E_T$$. GPD $$\bar E_T$$ 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.

Authors:
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Org.:
CLAS Collaboration
OSTI Identifier:
1574400
Report Number(s):
JLAB-PHY-18-2890; DOE/OR/23177-4613; arXiv:1902.02643
DOE Contract Number:  
AC05-06OR23177
Resource Type:
Conference
Journal Name:
Proceedings of Science, SPIN2018
Additional Journal Information:
Conference: SPIN2018, 10-14 Sep 2018. Ferrara, Italy
Country of Publication:
United States
Language:
English

Citation Formats

Kubarovsky, Valery. Status of the experimental studies on DVMP and transversity GPDs. United States: N. p., 2019. Web. doi:10.22323/1.346.0075.
Kubarovsky, Valery. Status of the experimental studies on DVMP and transversity GPDs. United States. doi:10.22323/1.346.0075.
Kubarovsky, Valery. Mon . "Status of the experimental studies on DVMP and transversity GPDs". United States. doi:10.22323/1.346.0075. https://www.osti.gov/servlets/purl/1574400.
@article{osti_1574400,
title = {Status of the experimental studies on DVMP and transversity GPDs},
author = {Kubarovsky, Valery},
abstractNote = {The cross section of the exclusive $\pi^0$ and $\eta$ electroproduction reaction $ep\to e^\prime p^\prime \pi^0/\eta$ was measured at Jefferson Lab with a 5.75-GeV electron beam and the CLAS detector. Differential cross sections $d^4\sigma/dtdQ^2dx_Bd\phi$ and structure functions $\sigma_U = \sigma_T+\epsilon\sigma_L, \sigma_{TT}$ and $\sigma_{LT}$, as functions of $t$ were obtained over a wide range of $Q^2$ and $x_B$. At low $t$, both $\pi^0$ and $\eta$ are described reasonably well by Generalized Parton Distributions (GPDs) in which chiral-odd transversity GPDs are dominant. Generalized form factors of the transversity GPDs $\langle H_T \rangle^{\pi,\eta}$ and $\langle \bar{E}_T \rangle^{\pi,\eta}$ were directly extracted from the experimental observables. The combined $\pi^0$ and $\eta$ 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 $H_T$ and $\bar E_T$. GPD $\bar E_T$ 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 = {10.22323/1.346.0075},
journal = {Proceedings of Science, SPIN2018},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {8}
}

Conference:
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