Measurement of Upsilon Production for p+p and p+d Interactions at 800 GeV

Details Measurement of Upsilon Production for p+p and p+d Interactions at 800 GeV Measurement of Upsilon Production for p+p and p+d Interactions at 800 GeV

2007-10-11

arxiv.org/abs/0710.2344v1

Phys.Rev.Lett.100:062301,2008

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages, 5 figures. Submitted for journal publication

Scientific paper

10.1103/PhysRevLett.100.062301

We report a high statistics measurement of Upsilon production with an 800 GeV/c proton beam on hydrogen and deuterium targets. The dominance of the gluon-gluon fusion process for Upsilon production at this energy implies that the cross section ratio, $\sigma (p + d \to \Upsilon) / 2\sigma (p + p\to \Upsilon)$, is sensitive to the gluon content in the neutron relative to that in the proton. Over the kinematic region 0 < x_F < 0.6, this ratio is found to be consistent with unity, in striking contrast to the behavior of the Drell-Yan cross section ratio $\sigma(p+d)_{DY}/2\sigma(p+p)_{DY}$. This result shows that the gluon distributions in the proton and neutron are very similar. The Upsilon production cross sections are also compared with the p+d and p+Cu cross sections from earlier measurements.

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