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Measurement of the longitudinal spin asymmetries for weak boson production in proton-proton collisions at s=510 GeV

Adam, J.
•
Adamczyk, L.
•
Adams, J. â R.
altro
Zyzak, M.
2019
  • journal article

Periodico
PHYSICAL REVIEW D
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 u ̄ 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.
DOI
10.1103/PhysRevD.99.051102
WOS
WOS:000461906000001
Archivio
http://hdl.handle.net/11368/2940513
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85064414031
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.99.051102
Diritti
open access
license:creative commons
license uri:http://creativecommons.org/licenses/by/4.0/
FVG url
https://arts.units.it/bitstream/11368/2940513/2/PhysRevD.99.051102.pdf
Soggetti
  • p p: scattering | p p...

Web of Science© citazioni
23
Data di acquisizione
Mar 19, 2024
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