20-27 July 2011
Alpes Congrès - Alpexpo
Europe/Paris timezone

COMPASS results on gluon polarisation

22 Jul 2011, 09:00
Bayard (Alpes Congrès - Alpexpo)


Alpes Congrès - Alpexpo

Parallel session talk QCD QCD


Dr Luis Silva (LIP Lisbon)


One of the missing keys in the present understanding of the spin structure of the nucleon is the contribution from the gluons: the so-called gluon polarisation. This quantity can be determined in DIS through the Photon-Gluon Fusion (PGF) process, in which two analysis methods may be used: (i) identifying open charm events or (ii) selecting events with high-p_T hadrons. The data used in the present work were collected by the COMPASS Experiment, where a naturally polarised muon beam of 160 GeV, impinging on a polarised nucleon fixed target, is used. Preliminary results for the gluon polarisation from high-p_T and open charm analyses are presented. The gluon polarisation result for high-p_T hadrons is divided, for the first time, into 3 independent x_g bins at LO. The result from open charm analysis is obtained at LO and NLO. In both analyses a new weighted method based on a neural network approach is used.

Primary author

Dr Luis Silva (LIP Lisbon)

Presentation Materials