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ID 45819
file
creator
PHENIX Collaboration
Iwanaga, Y.
Kijima, K. M.
Nakamiya, Y.
Nihashi, M.
Ouchida, M.
Torii, H.
Tsuchimoto, Y.
Watanabe, K.
NDC
Physics
abstract
Large parity-violating longitudinal single-spin asymmetries A^<e+>_<L> = 0.86^<+0.30>_<-0.14> and A^<e->_<L> = 0.88^<+0.12>_<-0.71> 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 ð(pp → W+X) × BR(W+ → e+ve) = 144.1 ± 21.2(stat)^<+3.4>_<-10.3>(syst) ± 21.6(norm) pb, and ð(pp → W-X) × BR(W- → e-v^^-e) = 31.7 ± 12.1(stat)^<+10.1>_<-8.2>(syst) ± 4.8(norm) pb.
journal title
Physical Review Letters
volume
Volume 106
issue
Issue 6
start page
062001-1
end page
062001-6
date of issued
2011-02-11
publisher
American Physical Society
issn
0031-9007
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 2011 American Physical Society
department
Graduate School of Science



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