The Strange Quark Polarisation from COMPASS data

Journal Article · Thu Dec 17 04:00:00 EST 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3293875· OSTI ID:21325697

Kouznetsov, O ^[1]

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1. 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, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1182; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

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