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This content will become publicly available on February 9, 2019

Title: Measurement of the Q 2 Dependence of the Deuteron Spin Structure Function g 1 and its Moments at Low Q 2 with CLAS

We measured the $$g_{1}$$ spin structure function of the deuteron at low $$Q^{2}$$, where QCD can be approximated with chiral perturbation theory ($$\chi PT$$). The data cover the resonance region, up to an invariant mass of $$W\approx1.9$$ GeV. The generalized GDH sum, the moment $$\Gamma_{1}^{d}$$ and the spin polarizability $$\gamma_{0}^{d}$$ are precisely determined down to a minimum $Q^2$ of 0.02 GeV$^2$ for the first time, about 2.5 times lower than that of previous data. We compare them to several $$\chi PT$$ calculations and models. In conclusion, these results are the first in a program of benchmark measurements of polarization observables in the $$\chi PT$$ domain.
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Publication Date:
Report Number(s):
JLAB-PHY-17-2585; DOE/OR/-23177-4273; arXiv:1711.01974
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US1801454
Grant/Contract Number:
AC05-06OR23177; SC0016583
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 120; Journal Issue: 6; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); George Washington Univ., Washington, DC (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); National Science Foundation (NSF); US Jeffress Memorial Trust; United Kingdoms Science and Technology Facilities Council (STFC); Italian Istituto Nazionale di Fisica Nucleare; French Centre National de la Recherche Scienti que; National Research Foundation of Korea (NRF)
Contributing Orgs:
CLAS Collaboration
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Strong Interaction; QCD in Nuclear Reactions; Chiral perturbation theory; meson electroproduction
OSTI Identifier:
1420097
Alternate Identifier(s):
OSTI ID: 1419908; OSTI ID: 1439828