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- W2096379969 abstract "Large parity-violating longitudinal single-spin asymmetries ALe+=−0.86−0.14+0.30 and ALe−=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 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+νe)=144.1±21.2(stat)−10.3+3.4(syst)±21.6(norm) pb, and σ(pp→W−X)×BR(W−→e−ν¯e)=31.7±12.1(stat)−8.2+10.1(syst)±4.8(norm) pb.Received 3 September 2010DOI:https://doi.org/10.1103/PhysRevLett.106.062001© 2011 American Physical Society" @default.
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