Measurement of the spin-dependent structure function g1( x) of the proton
Abstract
We have measured the spin-dependent structure function g1p of the proton in deep inelastic scattering of polarized muons off polarized protons, in the kinematic range 0.003 < x < 0.7 and 1 GeV 2 < Q2 < 60 GeV 2. Its first moment, ∫ 01g1p( x) dx, is found to be 0.136±0.011 (stat.)± 0.011 (syst.) at Q2 = 10GeV 2. This value is smaller than the prediction of the Ellis-Jaffe sum rule by two standard deviations, and is consistent with previous measurements. A combined analysis of all available proton, deuteron and neutron data confirms the Bjorken sum rule to within 10% of the theoretical value.
- Publication:
-
Physics Letters B
- Pub Date:
- June 1994
- DOI:
- 10.1016/0370-2693(94)90793-5
- arXiv:
- arXiv:hep-ph/9404270
- Bibcode:
- 1994PhLB..329..399A
- Keywords:
-
- High Energy Physics - Phenomenology;
- High Energy Physics - Experiment
- E-Print:
- 11 pages, CERN-PPE/94-57