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 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.
| Original language | English |
|---|---|
| Article number | 062501 |
| Journal | Physical Review Letters |
| Volume | 120 |
| Issue number | 6 |
| DOIs | |
| State | Published - Feb 8 2018 |
| Externally published | Yes |
Funding
This work was supported by the U.S. Department of Energy (DOE), the U.S. National Science Foundation, the U.S. Jeffress Memorial Trust, the Physics and Astronomy Department and the Office of Research and Economic Development at Mississippi State University, the United Kingdom Science and Technology Facilities Council (STFC), the Italian Istituto Nazionale di Fisica Nucleare, the French Institut National de Physique Nucléaire et de Physique des Particules, the French Centre National de la Recherche Scientifique, and the National Research Foundation of Korea. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under Contract No. DE-AC05-06OR23177.