Small x gluon from exclusive J/psi production

Details Small x gluon from exclusive J/psi production Small x gluon from exclusive J/psi production

2007-09-27

arxiv.org/abs/0709.4406v1

Phys.Lett.B662:252-258,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 5 figures

Scientific paper

10.1016/j.physletb.2008.02.067

Exclusive J/psi production, gamma* p -> J/psi p, offers a unique opportunity to determine the gluon density of the proton in the small x domain. We use the available HERA data to determine the gluon distribution in the region 10^{-4} <~ x <~ 10^{-2} and 2 <~ Q^2 <~ 10 GeV^2, where the uncertainty on the gluon extracted from the global parton analyses is large. The gluon density is found to be approximately flat at the lower scale; it is compared with those of recent global analyses.

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