Spin asymmetries for events with high pT hadrons in DIS and an evaluation of the gluon polarization

B. Adeva et al. (Spin Muon Collaboration)
Phys. Rev. D 70, 012002 – Published 23 July 2004
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Abstract

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 AplNlhhX=0.030±0.057(stat)±0.010(syst) and AdlNlhhX=0.070±0.076(stat)±0.010(syst). From these values we derive an averaged gluon polarization ΔG/G=0.20±0.28(stat)±0.10(syst) at an average fraction of nucleon momentum carried by gluons η=0.07.

  • Received 31 January 2004

DOI:https://doi.org/10.1103/PhysRevD.70.012002

©2004 American Physical Society

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Vol. 70, Iss. 1 — 1 July 2004

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