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Cross section and parity-violating spin asymmetries of W± boson production in polarized p + p collisions at sqrt[s] = 500 GeV.

Publication ,  Journal Article
Adare, A; Afanasiev, S; Aidala, C; Ajitanand, NN; Akiba, Y; Akimoto, R; Alexander, J; Al-Ta'ani, H; Andrews, KR; Angerami, A; Aoki, K; Bai, M ...
Published in: Physical review letters
February 2011

Large parity-violating longitudinal single-spin asymmetries A(L)(e+) = -0.86(-0.14) (+0.30) and A(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 sqrt[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+ ν(e)) = 144.1 ± 21.2(stat)(-10.3) (+3.4) (syst) ± 21.6(norm)  pb, and σ(pp → W- X) × BR(W- → e- ν[over ¯](e)) = 31.7 ± 12.1(stat)(-8.2) (+10.1) (syst) ± 4.8(norm)  pb.

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Published In

Physical review letters

DOI

EISSN

1079-7114

ISSN

0031-9007

Publication Date

February 2011

Volume

106

Issue

6

Start / End Page

062001

Related Subject Headings

  • General Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences
 

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Adare, A., Afanasiev, S., Aidala, C., Ajitanand, N. N., Akiba, Y., Akimoto, R., … PHENIX Collaboration, . (2011). Cross section and parity-violating spin asymmetries of W± boson production in polarized p + p collisions at sqrt[s] = 500 GeV. Physical Review Letters, 106(6), 062001. https://doi.org/10.1103/physrevlett.106.062001
Adare, A., S. Afanasiev, C. Aidala, N. N. Ajitanand, Y. Akiba, R. Akimoto, J. Alexander, et al. “Cross section and parity-violating spin asymmetries of W± boson production in polarized p + p collisions at sqrt[s] = 500 GeV.Physical Review Letters 106, no. 6 (February 2011): 062001. https://doi.org/10.1103/physrevlett.106.062001.
Adare A, Afanasiev S, Aidala C, Ajitanand NN, Akiba Y, Akimoto R, et al. Cross section and parity-violating spin asymmetries of W± boson production in polarized p + p collisions at sqrt[s] = 500 GeV. Physical review letters. 2011 Feb;106(6):062001.
Adare, A., et al. “Cross section and parity-violating spin asymmetries of W± boson production in polarized p + p collisions at sqrt[s] = 500 GeV.Physical Review Letters, vol. 106, no. 6, Feb. 2011, p. 062001. Epmc, doi:10.1103/physrevlett.106.062001.
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Published In

Physical review letters

DOI

EISSN

1079-7114

ISSN

0031-9007

Publication Date

February 2011

Volume

106

Issue

6

Start / End Page

062001

Related Subject Headings

  • General Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences