The Strange Quark Polarisation from COMPASS data
Journal Article
·
· AIP Conference Proceedings
- Joint Institute of Nuclear Research, Joliot Curie 6, 141980 Dubna (Russian Federation) and Universitaet Mainz, Institut fuer Kernphysik, 55099 Mainz (Germany)
The strange quark helicity distribution {delta}s(x) was derived at LO from the inclusive asymmetry A{sub a,d} and the semi-inclusive asymmetries A{sub 1,d}{sup {pi}}{sup +}, A{sub 1,d}{sup {pi}}{sup -}, A{sub 1,d}{sup K+}, A{sub 1,d}{sup K-}, measured by COMPASS in polarised deep inelastic muon-deuteron scattering. The distribution of {delta}s(x) is compatible with zero in the whole measured range. The value of the first moment of {delta}s and its error are very sensitive to the assumed value of the ratio of the s-bar-quark to u-quark fragmentation functions into positive kaons {integral}D(K+/s)(z)dz/{integral}D{sub u}{sup K+}(z)dz.
- OSTI ID:
- 21325697
- Journal Information:
- AIP Conference Proceedings, Vol. 1182, Issue 1; Conference: 10. conference on the intersections of particle and nuclear physics, San Diego, CA (United States), 26-31 May 2009; Other Information: DOI: 10.1063/1.3293875; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
DEEP INELASTIC SCATTERING
DEUTERONS
HELICITY
INCLUSIVE INTERACTIONS
KAONS PLUS
MULTIPARTICLE SPECTROMETERS
MUON-NEUTRON INTERACTIONS
MUON-PROTON INTERACTIONS
MUONS
NUCLEONS
PARTICLE IDENTIFICATION
PARTICLE KINEMATICS
POLARIZATION
S QUARKS
U QUARKS
ASYMMETRY
DEEP INELASTIC SCATTERING
DEUTERONS
HELICITY
INCLUSIVE INTERACTIONS
KAONS PLUS
MULTIPARTICLE SPECTROMETERS
MUON-NEUTRON INTERACTIONS
MUON-PROTON INTERACTIONS
MUONS
NUCLEONS
PARTICLE IDENTIFICATION
PARTICLE KINEMATICS
POLARIZATION
S QUARKS
U QUARKS