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Measurement of the longitudinal spin asymmetries for weak boson production in proton-proton collisions at s =510 GeV
Resource type
Authors/contributors
- STAR Collaboration (Author)
- Finch, Evan (Contributor)
Title
Measurement of the longitudinal spin asymmetries for weak boson production in proton-proton collisions at s =510 GeV
Abstract
We report new STAR measurements of the single-spin asymmetries AL for W+ and W- bosons produced in polarized proton-proton collisions at s=510 GeV as a function of the decay-positron and decay-electron pseudorapidity. The data were obtained in 2013 and correspond to an integrated luminosity of 250 pb-1. The results are combined with previous results obtained with 86 pb-1. A comparison with theoretical expectations based on polarized lepton-nucleon deep-inelastic scattering and prior polarized proton-proton data suggests a difference between the ū and d quark helicity distributions for 0.05<x<0.25. In addition, we report new results for the double-spin asymmetries ALL for W±, as well as AL for Z/γ∗ production and subsequent decay into electron-positron pairs. © 2019 authors. Published by the American Physical Society.
Publication
Physical Review D
Publisher
American Physical Society
Date
2019
Volume
99
Issue
5
Journal Abbr
Phy. Rev. D
Citation Key
starcollaborationMeasurementLongitudinalSpin2019
ISSN
24700010 (ISSN)
Archive
Scopus
Language
English
Extra
20 citations (Crossref) [2023-10-31]
Citation
STAR Collaboration. (2019). Measurement of the longitudinal spin asymmetries for weak boson production in proton-proton collisions at s =510 GeV. Physical Review D, 99(5). Scopus. https://doi.org/10.1103/PhysRevD.99.051102
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