Measurement of the Parity-Violating Longitudinal Single-Spin Asymmetry for W± Boson Production in Polarized Proton-Proton Collisions at √s=500 GeV

Scientific paper - Original scientific paper

• Author: M. M. Aggarwal
• Author: ...
• Author: Mirko Planinić
• Author: ...
• Author: Nikola Poljak
• Author: ...
• Author: Y. Zoulkarneeva
• Collaboration: STAR Collaboration
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

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 √s=500  GeV by the STAR experiment at RHIC. The measured asymmetries, AW+L=−0.27±0.10(stat.)±0.02(syst.)±0.03(norm.) and AW−L=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.

• Keywords (english): STAR; 200GeV; asymmetry
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Physical Review Letters
• Numbering: vol. 106, no. 6, 062002
• p-ISSN: 0031-9007
• e-ISSN: 1079-7114
• DOI: https://doi.org/10.1103/PhysRevLett.106.062002
• URN:NBN: urn:nbn:hr:217:126133
• Publication: 2011
• Project: Number: 119-0982887-1006; Title (croatian): Istraživanje hadronskih sustava upotrebom relativističkih projektila; Leader: Mirko Planinić; Jurisdiction: Croatia; Funding stream: ZP
• Document URL: http://link.aps.org/doi/10.1103/PhysRevLett.106.062002
• Type of resource: Text
• Access conditions: Open access
• Public note: Copyright (2011) by the American Physical Society. Received 3 September 2010; published 11 February 2011.
• Created on: 2019-11-03 18:50:15