The gluon polarisation ΔG/G at COMPASS

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Presentation transcript:

The gluon polarisation ΔG/G at COMPASS Colin Bernet (DAPNIA/SPHN), on behalf of the collaboration

The nucleon longitudinal spin structure Quarksspin Gluonsspin Orbital momentum

Quarks : the spin crisis Prediction (Ellis, Jaffe) 1988 – EMC: μ GeV2 P Axial anomaly

Polarized p-p (PHENIX, STAR) Gluons QCD evolution of g1 Polarized SIDIS Photon-gluon fusion (COMPASS,HERMES) μ p,n Polarized p-p (PHENIX, STAR)

Negatively polarized µ+ beam, 160 GeV LHC COMPASS SPS

μ Experimental setup DeuteronTarget μ ID Dipoles HCALS 200 tracking planes 250 physicists μ RICH

Open-charm tagging μ K- D0 D* π+ π+ COMPASS 2002

High pT tagging μ h1 h2

Selection of high pT events μ’ μ h2

Selection of high pT events GeV/c (GeV/c)2 No Q2 cut

Preliminary results Helicity asymmetry for high pT events, 2002 data Careful study of false asymmetries

Gluon polarisation ΔG/G μ Monte-Carlo simulation (PYTHIA)

Background – QCD Compton Contribution to the asymmetry :

Background – Resolved photons Contribution to the asymmetry :

Conclusion + 2003, 2004, f.o.m. improvements → stat. < 0.018 Monte-Carlo Background LEPTO