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., ...More

PHYSICAL REVIEW D, vol.70, no.1, 2004 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 70 Issue: 1
  • Publication Date: 2004
  • Doi Number: 10.1103/physrevd.70.012002
  • Journal Name: PHYSICAL REVIEW D
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED)
  • Istanbul Technical University Affiliated: No


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.