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Title: Beam-spin Asymmetries from Semi-inclusive Pion Electroproduction

Abstract

We have measured the moment A{sup sin{phi}}{sub LU} corresponding to the polarized electron beam-spin asymmetry in SIDIS. A{sup sin{phi}}{sub LU} is a twist-3 quantity providing information about quark-gluon correlations. Data were taken with the CLAS Spectrometer at Jefferson Lab using a 5.498 GeV longitudinally polarized electron beam and an unpolarized liquid hydrogen target. All three pion channels (pi{sup +}, pi{sup 0} and pi{sup -}) were measured simultaneously over a large range of kinematics within the virtuality range Q{sup 2} ~ 1.0-4.5 GeV{sup 2}. The observable was measured with good statistical precision over a large range of z, P{sub T}, x{sub B}, and Q{sup 2}, which permits comparison with several reaction models. The discussed measurements provide an upgrade in statistics over previous measurements, and serve as the first evidence for the negative sign of the {pi}{sup -} sin{phi} Moment.

Authors:
 [1];  [2];  [1];  [2]
  1. University of Connecticut, Storrs, CT (United States)
  2. Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1127340
Report Number(s):
JLAB-PHY-14-1846; DOE/OR/23177-3012; arXiv:1402.4097
Journal ID: ISSN 0556-2821; TRN: US1400279
DOE Contract Number:  
AC05-06OR23177
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 89; Journal Issue: 07; Journal ID: ISSN 0556-2821
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Gohn, Wesley P., Avakian, Harut A., Joo, Kyungseon, and Ungaro, Maurizio. Beam-spin Asymmetries from Semi-inclusive Pion Electroproduction. United States: N. p., 2014. Web. doi:10.1103/PhysRevD.89.072011.
Gohn, Wesley P., Avakian, Harut A., Joo, Kyungseon, & Ungaro, Maurizio. Beam-spin Asymmetries from Semi-inclusive Pion Electroproduction. United States. https://doi.org/10.1103/PhysRevD.89.072011
Gohn, Wesley P., Avakian, Harut A., Joo, Kyungseon, and Ungaro, Maurizio. 2014. "Beam-spin Asymmetries from Semi-inclusive Pion Electroproduction". United States. https://doi.org/10.1103/PhysRevD.89.072011. https://www.osti.gov/servlets/purl/1127340.
@article{osti_1127340,
title = {Beam-spin Asymmetries from Semi-inclusive Pion Electroproduction},
author = {Gohn, Wesley P. and Avakian, Harut A. and Joo, Kyungseon and Ungaro, Maurizio},
abstractNote = {We have measured the moment A{sup sin{phi}}{sub LU} corresponding to the polarized electron beam-spin asymmetry in SIDIS. A{sup sin{phi}}{sub LU} is a twist-3 quantity providing information about quark-gluon correlations. Data were taken with the CLAS Spectrometer at Jefferson Lab using a 5.498 GeV longitudinally polarized electron beam and an unpolarized liquid hydrogen target. All three pion channels (pi{sup +}, pi{sup 0} and pi{sup -}) were measured simultaneously over a large range of kinematics within the virtuality range Q{sup 2} ~ 1.0-4.5 GeV{sup 2}. The observable was measured with good statistical precision over a large range of z, P{sub T}, x{sub B}, and Q{sup 2}, which permits comparison with several reaction models. The discussed measurements provide an upgrade in statistics over previous measurements, and serve as the first evidence for the negative sign of the {pi}{sup -} sin{phi} Moment.},
doi = {10.1103/PhysRevD.89.072011},
url = {https://www.osti.gov/biblio/1127340}, journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 07,
volume = 89,
place = {United States},
year = {Tue Apr 01 00:00:00 EDT 2014},
month = {Tue Apr 01 00:00:00 EDT 2014}
}