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We present a determination of the gluon polarisation Δg/g in the nucleon, based on the longitudinal double-spin asymmetry of DIS events with Q2>1 (GeV/c)2 including a pair of large transverse-momentum hadrons in the final state. The data were obtained by the COMPASS experiment at CERN using a 160 GeV/c polarised muon beam scattering off a polarised View the MathML source target. The gluon polarisation is evaluated by a Neural Network approach for three intervals of the gluon momentum fraction xg covering the range 0.04<xg<0.27. The values obtained at leading order in QCD do not show any significant dependence on xg. Their average is Δg/g=0.125±0.060 (stat.)±0.063 (syst.) at average xg=0.09 and a scale of μ2=3 (GeV/c)2.

Leading order determination of the gluon polarisation from DIS events with high- hadron pairs / C., A., M. G., A., Alexakhin, V.Y.u., Alexandrov, Y.u., G. D., A., A., A., A. A., A., A., A., B., B., F., B., J., B., G., B., Y., B., J., B., R., B., M., B., K., B., J., B., Birsa, R., J., B., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 718:(2013), pp. 922-930. [10.1016/j.physletb.2012.11.056]

Leading order determination of the gluon polarisation from DIS events with high- hadron pairs

BIRSA, RENATO;BRADAMANTE, FRANCO;BRESSAN, Andrea;DALLA TORRE, SILVIA;DUIC, VENICIO;ELIA, CARMINE;GIORGI, MARCELLO;LEVORATO, STEFANO;Makke, Nour;MARTIN, ANNA;PESARO, GIULIA;SBRIZZAI, GIULIO;SCHIAVON, PAOLO;SOZZI, FEDERICA;
2013-01-01

Abstract

We present a determination of the gluon polarisation Δg/g in the nucleon, based on the longitudinal double-spin asymmetry of DIS events with Q2>1 (GeV/c)2 including a pair of large transverse-momentum hadrons in the final state. The data were obtained by the COMPASS experiment at CERN using a 160 GeV/c polarised muon beam scattering off a polarised View the MathML source target. The gluon polarisation is evaluated by a Neural Network approach for three intervals of the gluon momentum fraction xg covering the range 0.04
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2648074
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