Direct Measurement of the Gluon Polarisation in the Nucleon via Charmed Meson Production

Details Direct Measurement of the Gluon Polarisation in the Nucleon via Charmed Meson Production Direct Measurement of the Gluon Polarisation in the Nucleon via Charmed Meson Production

2008-02-21

arxiv.org/abs/0802.3023v1

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 3 figures

Scientific paper

We present the first measurement of the gluon polarisation in the nucleon based on the photon-gluon fusion process tagged by charmed meson production and decay to charged K and pi. The data were collected in polarised muon scattering off a polarised deuteron target by the COMPASS collaboration at CERN during 2002-2004. The result of this LO analysis is _x = -0.47 +- 0.44 (stat) +- 0.15 (syst) at ~= 0.11 and a scale mu^2 ~ 13 (GeV/c)^2.

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