Target and Beam Target Spin Asymmetries in Exclusive π+ and π- Electroproduction with 1.6 to 5.7 GeV Electrons

Authors

P. E. Bosted
S. Careccia, Old Dominion University
G. Dodge, Old Dominion University
S. E. Kuhn, Old Dominion University
Y. Prok, Old Dominion University
M. J. Amaryan, Old Dominion University
B. Torayev, Old Dominion University
L. B. Weinstein, Old Dominion University
Z. W. Zhao, Old Dominion University
CLAS Collaboration

Document Type

Article

Publication Date

2016

DOI

10.1103/PhysRevC.94.055201

Publication Title

Physical Review C

Volume

94

Issue

5

Pages

055201 (1-25)

Abstract

Beam-target double-spin asymmetries and target single-spin asymmetries in exclusive π⁺ and quasiexclusive π^- electroproduction were obtained from scattering of 1.6- to 5.7-GeV longitudinally polarized electrons from longitudinally polarized protons (for π⁺) and deuterons (for π^-) using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. The kinematic range covered is 1.1 < W < 2.6 GeV and 0.05 < Q² < 5 GeV², with good angular coverage in the forward hemisphere. The asymmetry results were divided into approximately 40 000 kinematic bins for π⁺ from free protons and 15 000 bins for π^- production from bound nucleons in the deuteron. The present results are found to be in reasonable agreement with fits to previous world data for W < 1.7 GeV and Q² < 0.5 GeV², with discrepancies increasing at higher values of Q², especially for W > 1.5 GeV. Very large target-spin asymmetries are observed for W > 1.6 GeV. When combined with cross-section measurements, the present results can provide powerful constraints on nucleon resonance amplitudes at moderate and large values of Q², for resonances with masses as high as 2.3 GeV.

Comments

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Original Publication Citation

Bosted, P. E., Biselli, A. S., Careccia, S., Dodge, G., Fersch, R., Guler, N., . . . Collaboration, C. (2016). Target and beam target spin asymmetries in exclusive π+ and π- electroproduction with 1.6 to 5.7 GeV electrons Physical Review C, 94(5), 055201. doi:10.1103/PhysRevC.94.055201

ORCID

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

Repository Citation

Bosted, P. E.; Careccia, S.; Dodge, G.; Kuhn, S. E.; Prok, Y.; Amaryan, M. J.; Torayev, B.; Weinstein, L. B.; Zhao, Z. W.; and CLAS Collaboration, "Target and Beam Target Spin Asymmetries in Exclusive π+ and π- Electroproduction with 1.6 to 5.7 GeV Electrons" (2016). Physics Faculty Publications. 153.
https://digitalcommons.odu.edu/physics_fac_pubs/153