Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2009-04-21
Phys.Lett.B676:31-38,2009
Physics
High Energy Physics
High Energy Physics - Experiment
Only Meta data changed (title), 16 pages, 3 figures
Scientific paper
10.1016/j.physletb.2009.04.059
The gluon polarisation in the nucleon has been determined by detecting charm production via D0 meson decay to charged K and pi in polarised muon scattering off a longitudinally polarised deuteron target. The data were taken by the COMPASS Collaboration at CERN between 2002 and 2006 and corresponds to an integrated luminosity of 2.8 fb^-1. The dominant underlying process of charm production is the photon-gluon fusion to a cc-bar pair. A leading order QCD approach gives an average gluon polarisation of (Delta g/g)_x= -0.49 +- 0.27(stat) +- 0.11(syst) at a scale mu^2 ~ 13 (GeV/c)^2 and at an average gluon momentum fraction (x) ~ 0.11. The longitudinal cross-section asymmetry for D0 production is presented in bins of the transverse momentum and the energy of the D0 meson.
Alekseev M.
COMPASS Collaboration
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