New Measurements of {delta}G/G at COMPASS

Journal Article · Fri Nov 17 00:00:00 EST 2006 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2402721· OSTI ID:20895090

Kabuss, Eva-Maria ^[1]

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1. Institut fuer Kernphysik, Universitaet Mainz, Becherweg 45, 55099 Mainz (Germany)

The COMPASS experiment at the CERN SPS is investigating the spin structure of the nucleon via scattering of polarised muons off polarised nucleons. Using a longitudinally polarised 6LiD target inclusive asymmetries and asymmetries for the photon gluon fusion process were determined.From the inclusive asymmetries the spin structure function, g{sub 1}{sup d}, is extracted in a wide kinematical range of x and Q2. The results are used in a subsequent NLO pQCD analysis of all existing g1 data to determine the contribution of the quarks to the nucleon spin and to estimate me gluon contribution.The photon gluon fusion process allows a direct measurement of the gluon contribution. Here, two different channels, open charm production and the production of high pT hadron pairs, are investigated. Preliminary results from both LO analyses using all COMPASS data from 2002 to 2004 are presented. They point to a small gluon contribution in agreement with the results from the QCD analysis.

• OSTI ID: 20895090
• Journal Information: AIP Conference Proceedings, Vol. 870, Issue 1; Conference: CIPAN2006: 9. conference on intersections of particle and nuclear physics, Rio Grande (Puerto Rico), 30 May - 3 Jun 2006; Other Information: DOI: 10.1063/1.2402721; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
CERN SPS SYNCHROTRON
COMPASS-D TOKAMAK
GLUONS
INCLUSIVE INTERACTIONS
MUON BEAMS
MUONS
NUCLEONS
PHOTONS
POLARIZATION
POLARIZED BEAMS
QUANTUM CHROMODYNAMICS
QUARKS
SPIN
STRUCTURE FUNCTIONS