Spin asymmetries for events with high p(T) hadrons in DIS and an evaluation of the gluon polarization


Adeva B., Arik E., Arvidson A., Badelek B., Baum G., Berglund P., ...Daha Fazla

PHYSICAL REVIEW D, cilt.70, 2004 (SCI İndekslerine Giren Dergi) identifier

Özet

We present a measurement of the longitudinal spin cross section asymmetry for deep-inelastic muon-nucleon interactions with two high transverse momentum hadrons in the final state. Two methods of event classification are used to increase the contribution of the photon-gluon fusion process to above 30%. The most effective one, based on a neural network approach, provides the asymmetries A(p)lN(-->)lhhX=0.030+/-0.057(stat)+/-0.010(syst) and A(d)lN(-->)lhhX=0.070+/-0.076(stat)+/-0.010(syst). From these values we derive an averaged gluon polarization DeltaG/G=-0.20+/-0.28(stat)+/-0.10(syst) at an average fraction of nucleon momentum carried by gluons =0.07.