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High Energy Physics - Experiment

arXiv:1010.2357 (hep-ex)
[Submitted on 12 Oct 2010 (v1), last revised 13 Oct 2010 (this version, v2)]

Title:Compass Results on Gluon Polarisation from High pT hadron pairs

Authors:L. Silva (for the COMPASS Collaboration)
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Abstract:One of the goals of the COMPASS experiment is the determination of the gluon polarisation \Delta G/G, for a deep understanding of the spin structure of the nucleon. In DIS the gluon polarisation can be measured via the Photon-Gluon-Fusion (PGF) process, identified by open charm production or by selecting high p_T hadron pairs in the final state. The data used for this work were collected by the COMPASS experiment during the years 2002-2004, using a 160 GeV naturally polarised positive muon beam scattering on a polarised nucleon target. A new preliminary result of the gluon polarisation \Delta G/G from high p_T hadron pairs in events with Q^2>1 (GeV/c)^2 is presented. In order to extract \Delta G/G, this analysis takes into account the leading process \gamma q contribution together with the PGF and QCD Compton processes. A new weighted method based on a neural network approach is used. A preliminary \Delta G/G result for events from quasi-real photoproduction (Q^2<1 (GeV/c)^2) is also presented.
Comments: prepared for the proceedings of the DSPIN09 - XIII Workshop on High Energy Spin Physics, Dubna, Russia, September 1 - 5, 2009
Subjects: High Energy Physics - Experiment (hep-ex)
Cite as: arXiv:1010.2357 [hep-ex]
  (or arXiv:1010.2357v2 [hep-ex] for this version)
  https://doi.org/10.48550/arXiv.1010.2357

Submission history

From: Luis Silva [view email]
[v1] Tue, 12 Oct 2010 11:32:22 UTC (94 KB)
[v2] Wed, 13 Oct 2010 10:44:53 UTC (94 KB)
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