2007/10/11 by NuSea Collaboration, Lilin Zhu, L. Y. Zhu +44 · 2 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.1103/physrevlett.100.062301
published as Phys.Rev.Lett.100:062301,2008 · 4 pages, 5 figures. Submitted for journal publication
arxiv created 2007/10/11 · openalex publication_date 2008/02/14 · arxiv updated 2012/08/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We report a high statistics measurement of \ensuremathΥ production with an 800 GeV/c proton beam on hydrogen and deuterium targets. The dominance of the gluon-gluon fusion process for \ensuremathΥ production at this energy implies that the cross section ratio, \ensuremathσ(p+d\ensuremath→\ensuremathΥ)/2\ensuremathσ(p+p\ensuremath→\ensuremathΥ), is sensitive to the gluon content in the neutron relative to that in the proton. Over the kinematic region 0<xF<0.6, this ratio is found to be consistent with unity, in striking contrast to the behavior of the Drell-Yan cross section ratio \ensuremathσ(p+d)DY/2\ensuremathσ(p+p)DY. This result shows that the gluon distributions in the proton and neutron are very similar. The \ensuremathΥ production cross sections are also compared with the p+d and p+Cu cross sections from earlier measurements.