Measurement of Beam-Spin Asymmetries for π⁺ Electroproduction Above the Baryon Resonance Region

Authors

K. V. Dharmawardane, Old Dominion University
G. E. Dodge, Old Dominion UniversityFollow
C. E. Hyde-Wright, Old Dominion UniversityFollow
S. E. Kuhn, Old Dominion UniversityFollow
L. M. Qin, Old Dominion University
F. Sabatié, Old Dominion University
L. B. Weinstein, Old Dominion UniversityFollow
J. Yun, Old Dominion University
et al.
CLAS Collaboration

Document Type

Article

Publication Date

2004

DOI

10.1103/PhysRevD.69.112004

Publication Title

Physical Review D

Volume

69

Issue

11

Pages

1-7

Abstract

We report the first evidence for a nonzero beam-spin azimuthal asymmetry in the electroproduction of positive pions in the deep-inelastic kinematic region. Data for the reaction e^→pe'π⁺X have been obtained using a polarized electron beam of 4.3 GeV with the CEBAF Large Acceptance Spectrometer at the Thomas Jefferson National Accelerator Facility. The amplitude of the sin ᵠ modulation increases with the momentum of the pion relative to the virtual photon, z. In the range z = 0.5-0.8 the average amplitude is 0.038 ± 0.005 ± 0.003 for a missing mass M_x > 1.1 GeV and 0.037 ± 0.007 ± 0.004 for M_x >1.4 GeV.

Comments

© 2004 The American Physical Society

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Publisher's version available at: https://doi.org/10.1103/PhysRevD.69.112004

Original Publication Citation

Dodge, G.E., Hyde-Wright, C.E., Kuhn, S.E., Qin, L.M., Weinstein, L.B., et al., CLAS Collaboration (2004). Measurement of beam-spin asymmetries for π⁺ electroproduction above the baryon resonance region. Physical Review D, 69(11), 1-7, Article 112004. https://doi.org/10.1103/PhysRevD.69.112004

ORCID

0000-0003-1582-2376 (Dodge), 0000-0001-7282-8120 (Hyde-Wright), 0000-0003-2243-6836 (Kuhn), 0000-0001-5416-2900 (Weinstein)

Repository Citation

Dharmawardane, K. V.; Dodge, G. E.; Hyde-Wright, C. E.; Kuhn, S. E.; Qin, L. M.; Sabatié, F.; Weinstein, L. B.; Yun, J.; et al.; and CLAS Collaboration, "Measurement of Beam-Spin Asymmetries for π⁺ Electroproduction Above the Baryon Resonance Region" (2004). Physics Faculty Publications. 512.
https://digitalcommons.odu.edu/physics_fac_pubs/512