Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2010-09-02
Phys.Rev.Lett.106:062001,2011
Physics
High Energy Physics
High Energy Physics - Experiment
PHENIX Collaboration - 376 authors, 6 pages text, 4 figures, 2 tables. Submitted to Phys. Rev. Lett. v2 has minor changes to m
Scientific paper
10.1103/PhysRevLett.106.062001
Large parity violating longitudinal single spin asymmetries A^{e^-}_L= -0.86^{+0.14}_{-0.30} and A^{e^+}_L= 0.88^{+0.12}_{-0.71} are observed for inclusive high transverse momentum electrons and positrons in polarized pp 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 Z^0 bosons, and the asymmetries directly demonstrate parity violation in the couplings of the W^{\pm} to the light quarks. The observed electron and positron yields were used to estimate W^\pm boson production cross sections equal to \sigma(pp \to W^+ X) \times BR(W^ \to \nu_e)= 144.1+/-21.2(stat)^{+3.4}_{-10.3}(syst) +/- 15%(norm) pb, and \sigma(pp \to W^{-}X) \times BR(W^\to e^-\bar{\nu_e}) = 31.7+/-12.1(stat)^{+10.1}_{-8.2}(syst)+/-15%(norm) pb.
Finger. M. jr.
Adare Andrew
Afanasiev S.
Aidala Christine
Ajitanand N. N.
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