Title

Measurement of the Q2 Dependence of the Deuteron Spin Structure Function g1 and its Moments at Low Q2 with CLAS

Authors

K. P. Adhikari, Old Dominion University
A. Deur, Thomas Jefferson National Accelerator Facility
L. El Fassi, Old Dominion University
H. Kang, Seoul National University
S. E. Kuhn, Old Dominion University
M. Ripani, Istituto Nazionale di Fisica Nucleare, Sezione di Genova
K. Slifer, University of Virginia
X. Zheng, University of Virginia
S. Adhikari, Florida International University
Z. Akbar, Florida State University
M. J. Amaryan, Old Dominion University
H. Avakian, Thomas Jefferson National Accelerator Facility
J. Ball, Institut de Recherche sur les Lois Fondamentales de l'Univers
I. Balossino, Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
L. Barion, Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
M. Battaglieri, Istituto Nazionale di Fisica Nucleare, Sezione di Genova
I. Bedlinskiy, Alikhanov Institute for Theoretical and Experimental Physics
A. S. Biselli, Fairfield University
P. Bosted, The College of William and Mary
W. J. Briscoe, The George Washington University
J. Brock, Thomas Jefferson National Accelerator Facility
S. Bültmann, Old Dominion University
V. D. Burkert, Thomas Jefferson National Accelerator Facility
F. Thanh Cao, University of Connecticut
C. Carlin, Thomas Jefferson National Accelerator Facility
D. S. Carman, Thomas Jefferson National Accelerator Facility
A. Celentano, Istituto Nazionale di Fisica Nucleare, Sezione di Genova
G. Charles, Old Dominion University
T. Chetry, Ohio University
G. Fedotov, Ohio University
K. Hicks, Ohio University
G. Niculescu, Ohio University

Document Type

Article

Publication Date

2-8-2018

Abstract

© 2018 American Physical Society. We measured the g1 spin structure function of the deuteron at low Q2, where QCD can be approximated with chiral perturbation theory (χPT). The data cover the resonance region, up to an invariant mass of W≈1.9 GeV. The generalized Gerasimov-Drell-Hearn sum, the moment Γ1d and the spin polarizability γ0d are precisely determined down to a minimum Q2 of 0.02 GeV2 for the first time, about 2.5 times lower than that of previous data. We compare them to several χPT calculations and models. These results are the first in a program of benchmark measurements of polarization observables in the χPT domain.

Share

COinS