Leading order determination of the gluon polarisation from DIS events with high-p_T hadron pairs

Details Leading order determination of the gluon polarisation from DIS events with high-p_T hadron pairs Leading order determination of the gluon polarisation from DIS events with high-p_T hadron pairs

2012-02-18

arxiv.org/abs/1202.4064v1

Physics

High Energy Physics

High Energy Physics - Experiment

13 pages, 6 figures and 3 tables

Scientific paper

We present a determination of the gluon polarisation Delta g/g in the nucleon, based on the longitudinal double-spin asymmetry of DIS events 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/c polarised muon beam scattering off a polarised ^6LiD target. The gluon polarisation is evaluated by a Neural Network approach for three intervals of the gluon momentum fraction x_g covering the range 0.04 < x_g < 0.27. The values obtained at leading order in QCD do not show any significant dependence on x_g. Their average is Delta g/g = 0.125 +/- 0.060 (stat.) +/- 0.063 (syst.) at x_g=0.09 and a scale of mu^2 = 3 (GeV/c)^2.

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