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Title: Nucleon spin structure studies at COMPASS

Abstract

One of the main goal of the COMPASS experiment at CERN is the study of the spin structure of the nucleon in DIS, by scattering 160 GeV polarized muon beam on a longitudinally (or transversely) polarized 6LiD target. Besides the scattered muon, the particles produced in the deep inelastic scattering are detected by a two stage magnetic spectrometer equipped with state of the art tracking and particle ID detectors.The emphasis of COMPASS muon program is the direct determination of the gluon polarization {delta}G/G, accessed via asymmetries involving photon-gluon fusion mechanism (PGF). Both open charm production (detecting D0's), as well as production of height pT hadron pairs are used to tag PGF. Preliminary results for {delta}G/G based on the analysis of 2002 and 2003 data are shown. In addition, improved measurement of the deuteron structure function g{sub 1}{sup d} at small x, as well as studies of transverse distribution functions in the deuteron by measuring Collins and Sivers azimuthal asymmetries, are reported.

Authors:
 [1]
  1. CEA/DAPNIA/SPhN, CE Saclay, F-91191 Gif-sur-Yvette CEDEX (France)
Publication Date:
OSTI Identifier:
20798100
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 814; Journal Issue: 1; Conference: 11. international conference on hadron spectroscopy, Rio de Janeiro (Brazil), 21-26 Aug 2005; Other Information: DOI: 10.1063/1.2176512; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; CERN; DEEP INELASTIC SCATTERING; DEUTERONS; DISTRIBUTION FUNCTIONS; GEV RANGE; GLUONS; MAGNETIC SPECTROMETERS; MUON BEAMS; MUONS; NUCLEONS; PARTICLE STRUCTURE; PHOTONS; POLARIZATION; POLARIZED BEAMS; POLARIZED TARGETS; SPIN; STRUCTURE FUNCTIONS

Citation Formats

Marchand, Claude. Nucleon spin structure studies at COMPASS. United States: N. p., 2006. Web. doi:10.1063/1.2176512.
Marchand, Claude. Nucleon spin structure studies at COMPASS. United States. doi:10.1063/1.2176512.
Marchand, Claude. Sat . "Nucleon spin structure studies at COMPASS". United States. doi:10.1063/1.2176512.
@article{osti_20798100,
title = {Nucleon spin structure studies at COMPASS},
author = {Marchand, Claude},
abstractNote = {One of the main goal of the COMPASS experiment at CERN is the study of the spin structure of the nucleon in DIS, by scattering 160 GeV polarized muon beam on a longitudinally (or transversely) polarized 6LiD target. Besides the scattered muon, the particles produced in the deep inelastic scattering are detected by a two stage magnetic spectrometer equipped with state of the art tracking and particle ID detectors.The emphasis of COMPASS muon program is the direct determination of the gluon polarization {delta}G/G, accessed via asymmetries involving photon-gluon fusion mechanism (PGF). Both open charm production (detecting D0's), as well as production of height pT hadron pairs are used to tag PGF. Preliminary results for {delta}G/G based on the analysis of 2002 and 2003 data are shown. In addition, improved measurement of the deuteron structure function g{sub 1}{sup d} at small x, as well as studies of transverse distribution functions in the deuteron by measuring Collins and Sivers azimuthal asymmetries, are reported.},
doi = {10.1063/1.2176512},
journal = {AIP Conference Proceedings},
number = 1,
volume = 814,
place = {United States},
year = {Sat Feb 11 00:00:00 EST 2006},
month = {Sat Feb 11 00:00:00 EST 2006}
}