Deep Exclusive π+ Electroproduction Off the Proton at CLAS

Authors

K. P. Adhikari, Old Dominion University
M. J. Amaryan, Old Dominion UniversityFollow
R. P. Bennett, Old Dominion University
G. E. Dodge, Old Dominion UniversityFollow
S. E. Kuhn, Old Dominion UniversityFollow
M. Mayer, Old Dominion University
C. S. Nepali, Old Dominion University
H. Seraydaryan, Old Dominion University
L. B. Weinstein, Old Dominion UniversityFollow
J. Zhang, Old Dominion University

Document Type

Article

Publication Date

2013

DOI

10.1140/epja/i2013-13016-9

Publication Title

European Physical Journal A

Volume

49

Issue

1

Pages

16 (1-18)

Abstract

The exclusive electroproduction of π ⁺ above the resonance region was studied using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Laboratory by scattering a 6GeV continuous electron beam off a hydrogen target. The large acceptance and good resolution of CLAS, together with the high luminosity, allowed us to measure the cross section for the γ ^* p → nπ ⁺ process in 140 (Q ², x _B , t) bins: 0.16 < x _B < 0.58, 1.6 GeV² < Q ² < 4.5 GeV² and 0.1 GeV² < −t < 5.3 GeV². For most bins, the statistical accuracy is on the order of a few percent. Differential cross sections are compared to four theoretical models, based either on hadronic or on partonic degrees of freedom. The four models can describe the gross features of the data reasonably well, but differ strongly in their ingredients. In particular, the model based on Generalized Parton Distributions (GPDs) contain the interesting potential to experimentally access transversity GPDs.

Comments

This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Original Publication Citation

Park, K., Guidal, M., Gothe, R. W., Laget, J. M., Garçon, M., Adhikari, K. P., . . . Zonta, I. (2013). Deep exclusive π+ electroproduction off the proton at CLAS. European Physical Journal A, 49(1), 16. doi:10.1140/epja/i2013-13016-9

ORCID

0000-0003-1582-2376 (Dodge), 0000-0003-2243-6836 (Kuhn)

Repository Citation

Adhikari, K. P.; Amaryan, M. J.; Bennett, R. P.; Dodge, G. E.; Kuhn, S. E.; Mayer, M.; Nepali, C. S.; Seraydaryan, H.; Weinstein, L. B.; and Zhang, J., "Deep Exclusive π+ Electroproduction Off the Proton at CLAS" (2013). Physics Faculty Publications. 355.
https://digitalcommons.odu.edu/physics_fac_pubs/355