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

Authors

M. M. Aggarwal
Z. Ahammed
A. V. Alakhverdyants
I. Alekseev
J. Alford
B. D. Andersdon
C. D. Anson
D. Arkhipkin
G. S. Averichev
J. Balewski
S. Bueltmann, Old Dominion University
D. Plyku, Old Dominion University

Document Type

Article

Publication Date

2011

DOI

10.1103/PhysRevLett.106.062002

Publication Title

Physical Review Letters

Volume

106

Issue

6

Pages

062002 (6 pp.)

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

Original Publication Citation

Aggarwal, M. M., Ahammed, Z., Alakhverdyants, A. V., Alekseev, I., Alford, J., Anderson, B. D., . . . Skoby, M. J. (2011). Measurement of the parity-violating longitudinal single-spin asymmetry for W^± boson production in polarized proton-proton collisions at √s=500 GeV. Physical Review Letters, 106(6), 062002. doi:10.1103/PhysRevLett.106.062002

Repository Citation

Aggarwal, M. M.; Ahammed, Z.; Alakhverdyants, A. V.; Alekseev, I.; Alford, J.; Andersdon, B. D.; Anson, C. D.; Arkhipkin, D.; Averichev, G. S.; Balewski, J.; Bueltmann, S.; and Plyku, D., "Measurement of the Parity-Violating Longitudinal Single-Spin Asymmetry for W± Boson Production in Polarized Proton-Proton Collisions at √s=500 GeV" (2011). Physics Faculty Publications. 160.
https://digitalcommons.odu.edu/physics_fac_pubs/160