Nucleon spin structure studies at COMPASS

Journal Article · Sat Feb 11 04:00:00 EST 2006 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2176512· OSTI ID:20798100

Marchand, Claude ^[1]

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1. CEA/DAPNIA/SPhN, CE Saclay, F-91191 Gif-sur-Yvette CEDEX (France)

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.

• OSTI ID: 20798100
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 814; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

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