DOI
10.1103/PhysRevLett.120.062501
Abstract
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 Γd1 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.
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 Γ_{1}^{d} and the spin polarizability γ_{0}^{d} 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.
Document Type
Article
Publication Date
2-8-2018
Publisher Statement
Copyright © 2018 American Physical Society. This article first appeared in Physical Review Letters 120, no. 6 (February 8, 2018): 062501: 1-7. doi.org/10.1103/PhysRevLett.120.062501.
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Recommended Citation
Adhikari, K. P., A. Deur, L. El Fassi, H. Kang, S. E. Kuhn, M. Ripani, K. Slifer, G. Gilfoyle, et al. “Measurement of the Q(2) Dependence of the Deuteron Spin Structure Function g(1) and Its Moments at Low Q(2) with CLAS.” Physical Review Letters 120, no. 6 (February 8, 2018): 062501. https://doi.org/10.1103/PhysRevLett.120.062501.