Cross Section and Parity-Violating Spin Asymmetries of W-+/- Boson Production in Polarized p plus p Collisions at root s=500 GeV
- Title
- Cross Section and Parity-Violating Spin Asymmetries of W-+/- Boson Production in Polarized p plus p Collisions at root s=500 GeV
- Author
- 김용균
- Keywords
- PARTON DISTRIBUTIONS; PHYSICS; SCATTERING; PROTON
- Issue Date
- 2011-02
- Publisher
- AMERICAN PHYSICAL SOC
- Citation
- PHYSICAL REVIEW LETTERS, v. 106, NO 6, Page. -
- Abstract
- Large parity-violating longitudinal single-spin asymmetries A(L)(e+) = 0.86(-0.14)(+0.30) and Ae(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 root s = 500 GeV with the PHENIX detector at RHIC. These e(+/-) come mainly from the decay of W-+/- and Z(0) 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 sigma(pp -> W+X) X BR(W+ -> e(+) nu(e)) = 144.1 +/- 21.2(stat)(-10.3)(+3.4)(syst) +/- 21.6(norm) pb, and sigma(pp -> W-X) X BR(W- -> e(-) (nu) over bar (e)) = 3.17 +/- 12.1(stat)(-8.2)(+10.1)(syst) +/- 4.8(norm) pb.
- URI
- https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.106.062001
- ISSN
- 0031-9007; 1079-7114
- DOI
- 10.1103/PhysRevLett.106.062001
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > NUCLEAR ENGINEERING(원자력공학과) > Articles
- Files in This Item:
- PhysRevLett.106.062001.pdfDownload
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