Global NLO Analysis of Nuclear Parton Distribution Functions

Details Global NLO Analysis of Nuclear Parton Distribution Functions Global NLO Analysis of Nuclear Parton Distribution Functions

2007-11-16

arxiv.org/abs/0711.2557v1

AIPConf.Proc.981:265-267,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages, LaTeX, 4 eps files, to be published in the AIP proceedings of the 9th International Workshop on Neutrino Factories, S

Scientific paper

10.1063/1.2898955

Nuclear parton distribution functions (NPDFs) are determined by a global analysis of experimental measurements on structure-function ratios F_2^A/F_2^{A'} and Drell-Yan cross section ratios \sigma_{DY}^A/\sigma_{DY}^{A'}, and their uncertainties are estimated by the Hessian method. The NPDFs are obtained in both leading order (LO) and next-to-leading order (NLO) of \alpha_s. As a result, valence-quark distributions are relatively well determined, whereas antiquark distributions at x>0.2 and gluon distributions in the whole x region have large uncertainties. The NLO uncertainties are slightly smaller than the LO ones; however, such a NLO improvement is not as significant as the nucleonic case.

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