Moments of the spin structure functions g(1)(p) and g(1)(d) for 0.05 < Q² < 3.0 GeV²

Authors

CLAS Collaboration
Y. Prok, Old Dominion UniversityFollow
K. V. Dharmawardane, Old Dominion University
G. E. Dodge, Old Dominion UniversityFollow
S. E. Kuhn, Old Dominion UniversityFollow
M. J. Amaryan, Old Dominion UniversityFollow
H. Bagdasaryan, Old Dominion University
M. Bektasoglu, Old Dominion University
S. Bültmann, Old Dominion UniversityFollow
S. L. Careccia, Old Dominion University
G. Gavalian, Old Dominion University
N. Guler, Old Dominion University
C. E. Hyde-Wright, Old Dominion UniversityFollow
H. G. Juengst, Old Dominion University
N. Kalantarians, Old Dominion University
A. Klein, Old Dominion UniversityFollow
J. Lachniet, Old Dominion University
R. A. Niyazov, Old Dominion University
L. M. Qin, Old Dominion University
S. Sabatie, Old Dominion University
S. Tkachenko, Old Dominion University
L. B. Weinstein, Old Dominion UniversityFollow
J. Zhang, Old Dominion University

Document Type

Article

Publication Date

2009

DOI

10.1016/j.physletb.2008.12.063

Publication Title

Physics Letters B

Volume

672

Issue

1

Pages

12-16

Abstract

The spin structure functions g1 for the proton and the deuteron have been measured over a wide kinematic range in x and Q² using 1.6 and 5.7 GeV longitudinally polarized electrons incident upon polarized NH3 and ND3 targets at Jefferson Lab. Scattered electrons were detected in the CEBAF Large Acceptance Spectrometer, for 0.05 < Q² < 5GeV² and W < 3 GeV. The first moments of g1 for the proton and deuteron are presented – both have a negative slope at low Q², as predicted by the extended Gerasimov–Drell–Hearn sum rule. The first extraction of the generalized forward spin polarizability of the proton γ p 0 the Q² evolution of the first moment of g1 shows agreement in leading order with Heavy Baryon Chiral Perturbation Theory. However, a significant discrepancy is observed between the γ p 0 data and Chiral Perturbation calculations for γ p 0, even at the lowest Q².

Comments

© 2009 Elsevier B.V. All rights reserved. Open access under CC BY license.

Original Publication Citation

Prok, Y., Bosted, P., Burkert, V. D., Deur, A., Dharmawardane, K. V., Dodge, G. E., . . . Collaboration, C. (2009). Moments of the spin structure functions g(1)(p) and g(1)(d) for 0.05 < Q² < 3.0 GeV². Physics Letters B, 672(1), 12-16. doi:10.1016/j.physletb.2008.12.063

ORCID

0000-0003-1582-2376 (Dodge), 0000-0003-2243-6836 (Kuhn), 0000-0002-5648-0256 (Amaryan), 0000-0001-7282-8120 (Hyde),0000-0001-5416-2900 (Weinstein)

Repository Citation

CLAS Collaboration; Prok, Y.; Dharmawardane, K. V.; Dodge, G. E.; Kuhn, S. E.; Amaryan, M. J.; Bagdasaryan, H.; Bektasoglu, M.; Bültmann, S.; Careccia, S. L.; Gavalian, G.; Guler, N.; Hyde-Wright, C. E.; Juengst, H. G.; Kalantarians, N.; Klein, A.; Lachniet, J.; Niyazov, R. A.; Qin, L. M.; Sabatie, S.; Tkachenko, S.; Weinstein, L. B.; and Zhang, J., "Moments of the spin structure functions g(1)(p) and g(1)(d) for 0.05 < Q² < 3.0 GeV²" (2009). Physics Faculty Publications. 250.
https://digitalcommons.odu.edu/physics_fac_pubs/250