Study of the isospin symmetry breaking in the light quark sea of the nucleon from the Drell-Yan process
Abstract
The ratio of cross-sections for muon pair production through the Drell-Yan process in p - p and p - d reactions has been measured at y ≈ 0, with 450 GeVc incident protons. The asymmetry A DY = {δ pp - δ pn}/{δ pp+δ pn} amounts to -0.09 ± 0.02 ± 0.025. The ratio {overlineu}/{overlined} of the nucleon sea structure functions derived from this measurement amounts to 0.51 ± 0.04 ± 0.05 at x = 0.18 and suggests that isospin symmetry is broken in the light quark sea of the nucleon.
- Publication:
-
Physics Letters B
- Pub Date:
- July 1994
- DOI:
- 10.1016/0370-2693(94)90884-2
- Bibcode:
- 1994PhLB..332..244B