Cross Section and Parity-Violating Spin Asymmetries of W{sup {+-}} Boson Production in Polarized p+p Collisions at {radical}(s)=500 GeV

Journal Article · Fri Feb 11 00:00:00 EST 2011 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.106.062001· OSTI ID:21532292

Adare, A; Kinney, E; Linden Levy, L A; Nagle, J L; Wysocki, M ^[1]; Afanasiev, S; Isupov, A; Litvinenko, A; Malakhov, A; Peresedov, V; Rukoyatkin, P; Zolin, L ^[2]; Aidala, C; Brooks, M L; Butsyk, S; Guo, L; Jiang, X; Kapustinsky, J; Kunde, G J; Lee, D M ^[3]

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1. University of Colorado, Boulder, Colorado 80309 (United States)
2. Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region (Russian Federation)
3. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

Large parity-violating longitudinal single-spin asymmetries A{sub L}{sup e+}=-0.86{sub -0.14}{sup +0.30} and A{sub L}{sup e-}=0.88{sub -0.71}{sup +0.12} are observed for inclusive high transverse momentum electrons and positrons in polarized p+p collisions at a center-of-mass energy of {radical}(s)=500 GeV with the PHENIX detector at RHIC. These e{sup {+-}} come mainly from the decay of W{sup {+-}} and Z{sup 0} bosons, and their asymmetries directly demonstrate parity violation in the couplings of the W{sup {+-}} to the light quarks. The observed electron and positron yields were used to estimate W{sup {+-}} boson production cross sections for the e{sup {+-}} channels of {sigma}(pp{yields}W{sup +}X)xBR(W{sup +}{yields}e{sup +}{nu}{sub e})=144.1{+-}21.2(stat){sub -10.3}{sup +3.4}(syst){+-}21.6(norm) pb, and {sigma}(pp{yields}W{sup -}X)xBR(W{sup -}{yields}e{sup -}{nu}{sub e})=31.7{+-}12.1(stat){sub -8.2}{sup +10.1}(syst){+-}4.8(norm) pb.

• OSTI ID: 21532292
• Journal Information: Physical Review Letters, Vol. 106, Issue 6; Other Information: DOI: 10.1103/PhysRevLett.106.062001; (c) 2011 American Institute of Physics; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ASYMMETRY
BOSONS
BROOKHAVEN RHIC
COLLISIONS
CROSS SECTIONS
D QUARKS
DECAY
ELECTRON NEUTRINOS
ELECTRONS
GEV RANGE 100-1000
MASS
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PARTICLE PRODUCTION
POSITRONS
PROTON-PROTON INTERACTIONS
SPIN
TRANSVERSE MOMENTUM
TUNGSTEN IONS
U QUARKS
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ANGULAR MOMENTUM
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CHARGED PARTICLES
ELEMENTARY PARTICLES
ENERGY RANGE
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GEV RANGE
HADRON-HADRON INTERACTIONS
HEAVY ION ACCELERATORS
INTERACTIONS
IONS
LEPTONS
LINEAR MOMENTUM
MASSLESS PARTICLES
MATTER
NEUTRINOS
NUCLEON-NUCLEON INTERACTIONS
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PARTICLE PROPERTIES
PROTON-NUCLEON INTERACTIONS
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