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

• Verfasst von: Adam, Jaroslav [VerfasserIn]
• Verfasst von: Deppner, Ingo Martin [VerfasserIn]
• Verfasst von: Herrmann, Norbert [VerfasserIn]
• Titel: Measurement of the longitudinal spin asymmetries for weak boson production in proton-proton collisions at √s=510 GeV
• Körperschaft: STAR Collaboration [VerfasserIn]
• Verf.angabe: J. Adam, I.M. Deppner, N. Herrmann [und 351 weitere] (STAR Collaboration)
• E-Jahr: 2019
• Jahr: 14 March 2019
• Umfang: 9 S.
• Fussnoten: Ganzer Ausdruck "s=510" steht unter dem Wurzelzeichen ; Gesehen am 22.07.2019
• Titel Quelle: Enthalten in: Physical review
• Ort Quelle: Woodbury, NY : Inst., 2016
• Jahr Quelle: 2019
• Band/Heft Quelle: 99(2019,5) Artikel-Nummer 051102(R), 9 Seiten
• ISSN Quelle: 2470-0029
• DOI: doi:10.1103/PhysRevD.99.051102
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1669553698

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.