Measurement of the Parity-Violating Longitudinal Single-Spin Asymmetry for W[superscript ±] Boson Production in Polarized Proton-Proton Collisions at [sqrt]s=500 GeV
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Aggarwal-2011-Measurement of the P.pdf
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Author(s)
Balewski, Jan T.
Betancourt, Michael Joseph
Corliss, Ross Cameron
Hays-Wehle, James Prewitt
Kocoloski, Adam Philip
Leight, William Axel
Sakuma, Tai
Seele, Joseph Patrick
Surrow, Bernd
Milner, Richard G
Alternative Title
Measurement of the Parity-Violating Longitudinal Single-Spin Asymmetry for W± Boson Production in Polarized Proton-Proton Collisions at √s=500 GeV
Date Issued
February 2011
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aggarwal, M.M. et al. (STAR Collaboration) "Measurement of the Parity-Violating Longitudinal Single-Spin Asymmetry for W± Boson Production in Polarized Proton-Proton Collisions at [sqrt]s=500 GeV." Phys. Rev. Lett. 106, 062002 (2011) [6 pages] © 2011 American Physical Society.
Version
Final published version
Abstract
We report the first measurement of the parity-violating single-spin asymmetries for midrapidity decay positrons and electrons from W+ and W- boson production in longitudinally polarized proton-proton collisions at [sqrt]s=500 GeV by the STAR experiment at RHIC. The measured asymmetries, AL[superscript W+]=-0.27±0.10(stat.)±0.02(syst.)±0.03(norm.) and AL[superscript W-]=0.14±0.19(stat.)±0.02(syst.)±0.01(norm.), are consistent with theory predictions, which are large and of opposite sign. These predictions are based on polarized quark and antiquark distribution functions constrained by polarized deep-inelastic scattering measurements.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.106.062002
