Gluon polarization in the nucleon from quasi-real photoproduction of high-pT hadron pairs

Details Gluon polarization in the nucleon from quasi-real photoproduction of high-pT hadron pairs Gluon polarization in the nucleon from quasi-real photoproduction of high-pT hadron pairs

2005-11-10

arxiv.org/abs/hep-ex/0511028v1

Phys.Lett.B633:25-32,2006

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages, 3 figures

Scientific paper

10.1016/j.physletb.2005.11.049

We present a determination of the gluon polarization Delta G/G in the nucleon, based on the helicity asymmetry of quasi-real photoproduction events, Q^2<1(GeV/c)^2, with a pair of large transverse-momentum hadrons in the final state. The data were obtained by the COMPASS experiment at CERN using a 160 GeV polarized muon beam scattered on a polarized 6-LiD target. The helicity asymmetry for the selected events is = 0.002 +- 0.019(stat.) +- 0.003(syst.). From this value, we obtain in a leading-order QCD analysis Delta G/G=0.024 +- 0.089(stat.) +- 0.057(syst.) at x_g = 0.095 and mu^2 =~ 3 (GeV}/c)^2.

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