Using Jet Asymmetries to access the Gluon Helicity Distribution of the Proton at STAR

Details Using Jet Asymmetries to access the Gluon Helicity Distribution of the Proton at STAR Using Jet Asymmetries to access the Gluon Helicity Distribution of the Proton at STAR

2006-06-02

arxiv.org/abs/nucl-ex/0606007v1

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 2 figures

Scientific paper

We present the first inclusive jet longitudinal double spin asymmetry A_LL and differential cross-section measurement from STAR. This analysis reflects ~1 pb^-1 of polarized pp data taken at sqrt{s}=200 GeV with beam polarizations of 30-45% in years 2003 and 2004. Agreement between the measured differential cross-section and next-to-leading order (NLO) calculations validate the interpretation of the asymmetry results within the framework of perturbative Quantum Chromodynamics (pQCD). A_LL is compared to NLO pQCD calculations, which incorporate several possible gluon helicity distributions, and is shown to disfavor the maximum gluon scenario.

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