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

STAR Collaboration

doi:10.1103/PhysRevD.99.051102

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

STAR Collaboration

Creighton University
AGH University of Krakow
Ohio State University
University of Kentucky
Kent State University
Joint Institute for Nuclear Research
Panjab University
Variable Energy Cyclotron Centre
Alikhanov Institute for Theoretical and Experimental Physics
Moscow Engineering Physics Institute
Texas A&M University
University of Tsukuba
Brookhaven National Laboratory
Tsinghua University
National Institute of Science Education and Research
University of California at Riverside
Stony Brook University
University of Houston
University of Jammu
Czech Technical University in Prague
Czech Academy of Sciences
Lehigh University
Rice University
Yale University
University of California at Davis
Shandong University
University of California at Los Angeles
National Cheng Kung University
Chinese Academy of Sciences
University of Science and Technology of China
Lawrence Berkeley National Laboratory
University of California at Berkeley
Eötvös Loránd University
Central China Normal University
Heidelberg University
Institute for High Energy Physics
Pennsylvania State University
Abilene Christian University
Purdue University
Wayne State University
University of Illinois at Chicago
Southern Connecticut State University
Technische Universität Darmstadt
Valparaiso University
Temple University
Indiana University Bloomington
University of Texas at Austin
Warsaw University of Technology
Goethe University Frankfurt
Argonne National Laboratory
Fudan University
Rutgers - The State University of New Jersey, New Brunswick
Institute of Physics Bhubaneswar
Pusan National University
Institute of Nuclear Physics PAN
Max Planck Institute for Physics (Werner Heisenberg Institute)
Universidade de São Paulo
Huzhou University
Michigan State University
United States Naval Academy

Research output: Contribution to journal › Article › peer-review

40 Scopus citations

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.

Original language	English
Article number	051102
Journal	Physical Review D
Volume	99
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevD.99.051102
State	Published - 1 Mar 2019
Externally published	Yes

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10.1103/PhysRevD.99.051102

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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",

author = "J. Adam and L. Adamczyk and Adams, \{J. R.\} and Adkins, \{J. K.\} and S. Kabana and \{STAR Collaboration\}",

note = "Publisher Copyright: {\textcopyright} 2019 authors. Published by the American Physical Society.",

year = "2019",

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AU - Adam, J.

AU - Adamczyk, L.

AU - Adams, J. R.

AU - Adkins, J. K.

AU - Kabana, S.

AU - STAR Collaboration

PY - 2019/3/1

Y1 - 2019/3/1

N2 - 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

AB - 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

UR - https://www.scopus.com/pages/publications/85064414031

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DO - 10.1103/PhysRevD.99.051102

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JO - Physical Review D

JF - Physical Review D

IS - 5

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ER -

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

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