Cross Sections and Beam Asymmetries for e ⃗ p → enπ+ in the Nucleon Resonance Region for 1.7 ⩽ Q² ⩽ 4.5 GeV²

Authors

M. J. Amaryan, Old Dominion UniversityFollow
H. Bagdasaryan, Old Dominion University
S. Bültmann, Old Dominion UniversityFollow
K. V. Dharmawardane, Old Dominion University
G. E. Dodge, Old Dominion UniversityFollow
G. Gavalian, Old Dominion University
N. Guler, Old Dominion University
C. E. Hyde-Wright, Old Dominion UniversityFollow
N. Kalantarians, Old Dominion University
A. Klein, Old Dominion University
A. V. Klimenko, Old Dominion University
S. E. Kuhn, Old Dominion UniversityFollow
J. Lachniet, Old Dominion University
R. A. Niyazov, Old Dominion University
F. Sabatié, Old Dominion University
S. Tkachenko, Old Dominion University
L. B. Weinstein, Old Dominion UniversityFollow
J. Zhang, Old Dominion University
et al.
The CLAS Collaboration

Document Type

Article

Publication Date

2008

DOI

10.1103/PhysRevC.77.015208

Publication Title

Physical Review C

Volume

77

Issue

1

Pages

1-17

Abstract

The exclusive electroproduction process e ⃗ p → e'nπ⁺ was measured in the range of the photon virtuality Q² =1.7-4.5 GeV², and the invariant mass range for the n π⁺ system of W=1.15-1.7 GeV using the CEBAF Large Acceptance Spectrometer. For the first time, these kinematics are probed in exclusive π⁺ production from protons with nearly full coverage in the azimuthal and polar angles of the nπ⁺ center-of-mass system. The nπ⁺ channel has particular sensitivity to the isospin 1/2 excited nucleon states, and together with the pπ⁰ final state will serve to determine the transition form factors of a large number of resonances. The largest discrepancy between these results and present modes was seen in the σ_LT structure function. In this experiment, 31,295 cross section and 4,184 asymmetry data points were measured. Because of the large volume of data, only a reduced set of structure functions and Legendre polynomial moments can be presented that are obtained in model-independent fits to the differential cross sections.

Comments

© 2008 The American Physical Society

"Yes, the author or the author's employer may use all or part of the APS published article, including the APS-prepared version (e.g., the PDF from the online journal) without revision or modification, on the author's or employer's website as long as a fee is not charged. If a fee is charged, then APS permission must be sought. In all cases, the appropriate bibliographic citation and notice of the APS copyright must be included."

Publisher's version available at: https://doi.org/10.1103/PhysRevC.77.015208

Original Publication Citation

Amaryan, M.J., Bültmann, S., Dodge, G., Hyde-Wright, C.E., Kuhn, S.E., (2008). Cross sections and beam asymmetries for e ⃗ p → enπ⁺ in the nucleon resonance region for 1.7 ⩽ Q² ⩽ 4.5 GeV². Physical Review C, 77(1), 1-17, Article 015208. https://doi.org/10.1103/PhysRevC.77.015208

ORCID

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

Repository Citation

Amaryan, M. J.; Bagdasaryan, H.; Bültmann, S.; Dharmawardane, K. V.; Dodge, G. E.; Gavalian, G.; Guler, N.; Hyde-Wright, C. E.; Kalantarians, N.; Klein, A.; Klimenko, A. V.; Kuhn, S. E.; Lachniet, J.; Niyazov, R. A.; Sabatié, F.; Tkachenko, S.; Weinstein, L. B.; Zhang, J.; et al.; and The CLAS Collaboration, "Cross Sections and Beam Asymmetries for e ⃗ p → enπ+ in the Nucleon Resonance Region for 1.7 ⩽ Q² ⩽ 4.5 GeV²" (2008). Physics Faculty Publications. 467.
https://digitalcommons.odu.edu/physics_fac_pubs/467