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

Journal Article · · Physical Review D
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We report new STAR measurements of the single-spin asymmetries $${A}_{L}$$ for $${W}^{+}$$ and $${W}^{{-}}$$ bosons produced in polarized proton-proton collisions at $$\sqrt{s}=510\text{ }\text{ }\mathrm{GeV}$$ as a function of the decay-positron and decay-electron pseudorapidity. The data were obtained in 2013 and correspond to an integrated luminosity of $$250\text{ }\text{ }{\mathrm{pb}}^{{-}1}$$. The results are combined with previous results obtained with $$86\text{ }\text{ }{\mathrm{pb}}^{{-}1}$$. A comparison with theoretical expectations based on polarized lepton-nucleon deep-inelastic scattering and prior polarized proton-proton data suggests a difference between the $$\overline{u}$$ and $$\overline{d}$$ quark helicity distributions for 0.05 < x < 0.25. In addition, we report new results for the double-spin asymmetries $${A}_{LL}$$ for $${W}^{\pm{}}$$, as well as $${A}_{L}$$ for $$Z/{{\gamma}}^{*}$$ production and subsequent decay into electron-positron pairs.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Texas A & M Univ., College Station, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Organization:
STAR Collaboration
Grant/Contract Number:
SC0012704; AC02-05CH11231; SC0015636
OSTI ID:
1499838
Alternate ID(s):
OSTI ID: 1485777; OSTI ID: 1501565; OSTI ID: 1505529; OSTI ID: 1787624
Report Number(s):
BNL-209741-2018-JAAM; BNL-211394-2019-JAAM; PRVDAQ; 051102
Journal Information:
Physical Review D, Journal Name: Physical Review D Vol. 99 Journal Issue: 5; ISSN 2470-0010
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 17 works
Citation information provided by
Web of Science

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Cited By (1)

Elliptic Flow of Identified Particles in Pb–Pb Collisions at s NN = 5.02 TeV journal January 2020

Figures / Tables (7)