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Title: Gluon Polarisation in the Nucleon from High Transverse Momentum Hadron Pairs at COMPASS

Abstract

The main goal of the COMPASS spin physics programme is the measurement of the helicity contribution of the gluons, {delta}G/G, to the nucleon spin. It is determined from the longitudinal spin asymmetry in the scattering of 160 GeV polarised muons off a polarised LiD target. The new analysis and new COMPASS {delta}G/G result obtained from high transverse momentum hadron pairs for Q{sup 2}>1(GeV/c){sup 2} is presented. The weighted method based on a Neural Network approach is discussed. The result of {delta}G/G 0.08{+-}0.10(stat){+-}0.05(syst)disfavors a large positive contribution to the nucleon spin for a gluon momentum fraction around 0.08 and agrees with the previously obtained result from the analysis for the small Q{sup 2} kinematical region (Q{sup 2}<1(GeV/c){sup 2})

Authors:
 [1]
  1. A. Soltan Institute for Nuclear Studies, Hoza 69, 00-681 (Poland)
Publication Date:
OSTI Identifier:
21316922
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1149; Journal Issue: 1; Conference: 18. international spin physics symposium, Charlottesville, VA (United States), 6-11 Oct 2008; Other Information: DOI: 10.1063/1.3215658; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; DEUTERIUM TARGET; FOUR MOMENTUM TRANSFER; GEV RANGE; GLUONS; HELICITY; MULTIPARTICLE SPECTROMETERS; MUON BEAMS; MUON REACTIONS; MUON-NUCLEON INTERACTIONS; NEURAL NETWORKS; PARTICLE IDENTIFICATION; POLARIZATION; POLARIZED BEAMS; POLARIZED TARGETS; QUANTUM CHROMODYNAMICS; SPIN; TRANSVERSE MOMENTUM

Citation Formats

Kurek, Krzysztof. Gluon Polarisation in the Nucleon from High Transverse Momentum Hadron Pairs at COMPASS. United States: N. p., 2009. Web. doi:10.1063/1.3215658.
Kurek, Krzysztof. Gluon Polarisation in the Nucleon from High Transverse Momentum Hadron Pairs at COMPASS. United States. https://doi.org/10.1063/1.3215658
Kurek, Krzysztof. 2009. "Gluon Polarisation in the Nucleon from High Transverse Momentum Hadron Pairs at COMPASS". United States. https://doi.org/10.1063/1.3215658.
@article{osti_21316922,
title = {Gluon Polarisation in the Nucleon from High Transverse Momentum Hadron Pairs at COMPASS},
author = {Kurek, Krzysztof},
abstractNote = {The main goal of the COMPASS spin physics programme is the measurement of the helicity contribution of the gluons, {delta}G/G, to the nucleon spin. It is determined from the longitudinal spin asymmetry in the scattering of 160 GeV polarised muons off a polarised LiD target. The new analysis and new COMPASS {delta}G/G result obtained from high transverse momentum hadron pairs for Q{sup 2}>1(GeV/c){sup 2} is presented. The weighted method based on a Neural Network approach is discussed. The result of {delta}G/G 0.08{+-}0.10(stat){+-}0.05(syst)disfavors a large positive contribution to the nucleon spin for a gluon momentum fraction around 0.08 and agrees with the previously obtained result from the analysis for the small Q{sup 2} kinematical region (Q{sup 2}<1(GeV/c){sup 2})},
doi = {10.1063/1.3215658},
url = {https://www.osti.gov/biblio/21316922}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1149,
place = {United States},
year = {Tue Aug 04 00:00:00 EDT 2009},
month = {Tue Aug 04 00:00:00 EDT 2009}
}