Measurement of the parity-violating longitudinal single-spin asymmetry for W{sup {+-}} boson production in polarized proton-proton collisions at {radical}(s) = 500 GeV

Journal Article · Fri Jul 15 04:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3601422· OSTI ID:21608236

Igo, G ^[1]

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1. University of California, Los Angeles, California 90095 (United States)

We report the first measurement of the parity violating single-spin asymmetries for midrapidity decay positrons and electrons from W{sup +} and W{sup -} boson production in longitudinally polarized proton-proton collisions at {radical}(s) = 500 GeV by the STAR experiment at RHIC. The measured asymmetries, A{sub L}{sup W+} = -0.27{+-}0.10(stat.){+-}0.02(syst.){+-}0.03(norm.) and A{sub L}{sup W-} 0.14{+-}0.19(stat.){+-}0.02(syst.){+-}0.01(norm.), are consistent with theory predictions, which are large and of opposite sign. These predictions are based on polarized quark and antiquark distribution functions constrained by polarized DIS measurements.

• OSTI ID: 21608236
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1350; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
ANGULAR MOMENTUM
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
ANTIQUARKS
ASYMMETRY
BARYON-BARYON INTERACTIONS
BEAMS
BOSONS
BROOKHAVEN RHIC
COLLIDING BEAMS
DECAY
DISTRIBUTION FUNCTIONS
ELECTRONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FUNCTIONS
GEV RANGE
HADRON-HADRON INTERACTIONS
HEAVY ION ACCELERATORS
INTERACTIONS
INTERMEDIATE BOSONS
INTERMEDIATE VECTOR BOSONS
LEPTONS
MATTER
MEASURING INSTRUMENTS
MULTIPARTICLE SPECTROMETERS
NUCLEON BEAMS
NUCLEON-NUCLEON INTERACTIONS
PARITY
PARTICLE BEAMS
PARTICLE DECAY
PARTICLE IDENTIFICATION
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
POLARIZED BEAMS
POSITRONS
PROTON BEAMS
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
QUARKS
SPECTROMETERS
SPIN
STORAGE RINGS
W MINUS BOSONS
W PLUS BOSONS