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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, JR Adkins, JK Agakishiev, G Aggarwal, MM Ahammed, Z Alekseev, I Anderson, DM Aoyama, R
Adam, J
Adamczyk, L
Adams, JR
Adkins, JK
Agakishiev, G
Aggarwal, MM
Ahammed, Z
Alekseev, I
Anderson, DM
Aoyama, R
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Journal Article
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2019-03-01
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10.1103/PhysRevD.99.051102
Abstract
© 2019 authors. Published by the American Physical Society. 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.
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Physical Review D
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