Constraint on Δg(x) from π^0 production at RHIC

Details Constraint on Δg(x) from π^0 production at RHIC Constraint on Δg(x) from π^0 production at RHIC

2006-12-05

arxiv.org/abs/hep-ph/0612037v1

AIPConf.Proc.915:412-415,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 4 eps figures, to be published in AIP proceedings of the 17th International Spin Physics Symposium (SPIN2006), Oct. 2

Scientific paper

10.1063/1.2750809

We determine the polarized gluon distribution \Delta g(x) by a global analysis using current DIS and \pi^0 asymmetry data. The \pi^0 data from RHIC-Spin experiments provide a strong constraint on \Delta g(x), so that its uncertainty is reduced. However, a sign problem appears in the analysis using \pi^0 data, which means that positive and negative distributions are allowed for \Delta g(x). These two types of solutions are discussed.

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