Beam-Spin Asymmetries From Semi-Inclusive Pion Electroproduction

Authors

K. P. Adhikari, Old Dominion University
M. J. Amaryan, Old Dominion UniversityFollow
C. Hyde, Old Dominion UniversityFollow
S. Koirala, Old Dominion University
S. E. Kuhn, Old Dominion UniversityFollow
L. B. Weinstein, Old Dominion UniversityFollow
et al.
The CLAS Collaboration

Document Type

Article

Publication Date

2014

DOI

10.1103/PhysRevD.89.072011

Publication Title

Physical Review D

Volume

89

Issue

7

Pages

1-15

Abstract

We have measured the moment A^{sin ɸ}_LU corresponding to the polarized electron beam-spin asymmetry in semi-inclusive deep inelastic scattering. A^{sin ɸ}_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 (π⁺,π⁰ and π^-) were measured simultaneously over a large range of kinematics within the virtuality range Q² ≈ 1.0- 4.5 GeV². The observable was measured with better than 1% statistical precision over a large range of z, P_T, x_B, and Q², 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 π^- sin ɸ moment.

Comments

© 2014 American Physical Society

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Publisher's version available at: https://doi.org/10.1103/PhysRevD.89.072011

Original Publication Citation

Adhikari, K.P., Amaryan, M.J., Hyde, C., Koirala, S., Kuhn, S.E., Weinstein, L.B., The CLAS Collaboration (2014). Beam-spin asymmetries from semi-inclusive pion electroproduction. Physical Review D, 89(7), pp.1-15, Article 072011. https://doi.org/10.1103/PhysRevD.89.072011

ORCID

0000-0001-7282-8120 (Hyde), 0000-0003-2243-6836 (Kuhn)

Repository Citation

Adhikari, K. P.; Amaryan, M. J.; Hyde, C.; Koirala, S.; Kuhn, S. E.; Weinstein, L. B.; et al.; and The CLAS Collaboration, "Beam-Spin Asymmetries From Semi-Inclusive Pion Electroproduction" (2014). Physics Faculty Publications. 462.
https://digitalcommons.odu.edu/physics_fac_pubs/462