期刊
PHYSICAL REVIEW LETTERS
卷 106, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.062001
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资金
- Office of Nuclear Physics in DOE Office of Science
- NSF (USA)
- MEXT (Japan)
- JSPS (Japan)
- CNPq (Brazil)
- FAPESP (Brazil)
- NSFC (China)
- MSMT (Czech Republic)
- IN2P3/CNRS (France)
- CEA (France)
- BMBF (Germany)
- DAAD (Germany)
- AvH (Germany)
- OTKA (Hungary)
- DAE (India)
- DST (India)
- ISF (Israel)
- NRF (Korea)
- WCU (Korea)
- MES (Russia)
- RAS (Russia)
- FAAE (Russia)
- VR (Sweden)
- KAW (Sweden)
- U.S. CRDF for the FSU
- Hungary-U.S. HAESF
- U.S.-Israel BSF
- Grants-in-Aid for Scientific Research [22244022] Funding Source: KAKEN
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.
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