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Direct Measurement of the Gluon Polarisation in the Nucleon via Charmed Meson Production (2008)

Abstract
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.

Publication details
Download http://arxiv.org/pdf/0802.3023.pdf
http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=phep-2008-003
http://cdsweb.cern.ch/record/1090440/files/phep-2008-003.pdf
Repository CERN Document Server (Switzerland)
Keywords Particle Physics - Experimental Results
Language eng