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Cross section and parity-violating spin asymmetries of W± boson production in polarized p + p collisions at sqrts = 500 GeV

Adare, A ; Afanasiev, S ; Aidala, C ; Ajitanand, N N ; Akiba, Y ; Akimoto, R ; Alexander, J ; Al-Ta'Ani, H ; Andrews, K R ; Angerami, A ; Aoki, K ; Apadula, N ; Appelt, E ; Aramaki, Y ; Armendariz, R ; Aschenauer, E C ; Awes, T C ; Azmoun, B ; Babintsev

Physical review letters, 11 February 2011, Vol.106(6), pp.062001 [Periódico revisado por pares]

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  • Título:
    Cross section and parity-violating spin asymmetries of W± boson production in polarized p + p collisions at sqrts = 500 GeV
  • Autor: Adare, A ; Afanasiev, S ; Aidala, C ; Ajitanand, N N ; Akiba, Y ; Akimoto, R ; Alexander, J ; Al-Ta'Ani, H ; Andrews, K R ; Angerami, A ; Aoki, K ; Apadula, N ; Appelt, E ; Aramaki, Y ; Armendariz, R ; Aschenauer, E C ; Awes, T C ; Azmoun, B ; Babintsev
  • Assuntos: High Energy Physics - Experiment
  • É parte de: Physical review letters, 11 February 2011, Vol.106(6), pp.062001
  • Descrição: Large parity-violating longitudinal single-spin asymmetries A(L)(e+) = -0.86(-0.14) (+0.30) and A(L)(e-) = 0.88(-0.71) (+0.12) are observed for inclusive high transverse momentum electrons and positrons in polarized p+p collisions at a center-of-mass energy of sqrt[s] = 500 GeV with the PHENIX detector at RHIC. These e± come mainly from the decay of W± and Z0 bosons, and their asymmetries directly demonstrate parity violation in the couplings of the W± to the light quarks. The observed electron and positron yields were used to estimate W± boson production cross sections for the e± channels of σ(pp → W+ X) × BR(W+ → e+ ν(e)) = 144.1 ± 21.2(stat)(-10.3) (+3.4) (syst) ± 21.6(norm)  pb, and σ(pp → W- X) × BR(W- → e- ν[over ¯](e)) = 31.7 ± 12.1(stat)(-8.2) (+10.1) (syst) ± 4.8(norm)  pb.
  • Idioma: Inglês

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