Measurement of the Parity-Violating Longitudinal Single-Spin Asymmetry for W± Boson Production in Polarized Proton-Proton Collisions at √s=500  GeV

M.M. Aggarwal; Z. Ahammed; E Braidot; A. Mischke; T. Peitzmann; M. van Leeuwen; Y. Zoulkarneeva

doi:10.1103/PhysRevLett.106.062002

Measurement of the Parity-Violating Longitudinal Single-Spin Asymmetry for W± Boson Production in Polarized Proton-Proton Collisions at √s=500 GeV

M.M. Aggarwal
, Z. Ahammed
, E Braidot
, A. Mischke
, T. Peitzmann
, M. van Leeuwen
, Y. Zoulkarneeva

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

Abstract

We report the first measurement of the parity-violating single-spin asymmetries for midrapidity decay positrons and electrons from W+ and W- boson production in longitudinally polarized proton-proton collisions at √s=500 GeV by the STAR experiment at RHIC. The measured asymmetries, ALW+=-0.27±0.10(stat.)±0.02(syst.)±0.03(norm.) and ALW-=0.14±0.19(stat.)±0.02(syst.)±0.01(norm.), are consistent with theory predictions, which are large and of opposite sign. These predictions are based on polarized quark and antiquark distribution functions constrained by polarized deep-inelastic scattering measurements.

Original language	English
Pages (from-to)	062002/1-062002/6
Number of pages	6
Journal	Physical Review Letters
Volume	106
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevLett.106.062002
Publication status	Published - 2011

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@article{7b2a9ffe0b1d45479f0c387c11ca664c,

title = "Measurement of the Parity-Violating Longitudinal Single-Spin Asymmetry for W± Boson Production in Polarized Proton-Proton Collisions at √s=500 GeV",

abstract = "We report the first measurement of the parity-violating single-spin asymmetries for midrapidity decay positrons and electrons from W+ and W- boson production in longitudinally polarized proton-proton collisions at √s=500 GeV by the STAR experiment at RHIC. The measured asymmetries, ALW+=-0.27±0.10(stat.)±0.02(syst.)±0.03(norm.) and ALW-=0.14±0.19(stat.)±0.02(syst.)±0.01(norm.), are consistent with theory predictions, which are large and of opposite sign. These predictions are based on polarized quark and antiquark distribution functions constrained by polarized deep-inelastic scattering measurements.",

author = "M.M. Aggarwal and Z. Ahammed and E Braidot and A. Mischke and T. Peitzmann and \{van Leeuwen\}, M. and Y. Zoulkarneeva",

year = "2011",

doi = "10.1103/PhysRevLett.106.062002",

language = "English",

volume = "106",

pages = "062002/1--062002/6",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "6",

}

Aggarwal, MM, Ahammed, Z, Braidot, E, Mischke, A, Peitzmann, T , van Leeuwen, M & Zoulkarneeva, Y 2011, 'Measurement of the Parity-Violating Longitudinal Single-Spin Asymmetry for W± Boson Production in Polarized Proton-Proton Collisions at √s=500 GeV', Physical Review Letters, vol. 106, no. 6, pp. 062002/1-062002/6. https://doi.org/10.1103/PhysRevLett.106.062002

TY - JOUR

T1 - Measurement of the Parity-Violating Longitudinal Single-Spin Asymmetry for W± Boson Production in Polarized Proton-Proton Collisions at √s=500 GeV

AU - Aggarwal, M.M.

AU - Ahammed, Z.

AU - Braidot, E

AU - Mischke, A.

AU - Peitzmann, T.

AU - van Leeuwen, M.

AU - Zoulkarneeva, Y.

PY - 2011

Y1 - 2011

N2 - We report the first measurement of the parity-violating single-spin asymmetries for midrapidity decay positrons and electrons from W+ and W- boson production in longitudinally polarized proton-proton collisions at √s=500 GeV by the STAR experiment at RHIC. The measured asymmetries, ALW+=-0.27±0.10(stat.)±0.02(syst.)±0.03(norm.) and ALW-=0.14±0.19(stat.)±0.02(syst.)±0.01(norm.), are consistent with theory predictions, which are large and of opposite sign. These predictions are based on polarized quark and antiquark distribution functions constrained by polarized deep-inelastic scattering measurements.

AB - We report the first measurement of the parity-violating single-spin asymmetries for midrapidity decay positrons and electrons from W+ and W- boson production in longitudinally polarized proton-proton collisions at √s=500 GeV by the STAR experiment at RHIC. The measured asymmetries, ALW+=-0.27±0.10(stat.)±0.02(syst.)±0.03(norm.) and ALW-=0.14±0.19(stat.)±0.02(syst.)±0.01(norm.), are consistent with theory predictions, which are large and of opposite sign. These predictions are based on polarized quark and antiquark distribution functions constrained by polarized deep-inelastic scattering measurements.

U2 - 10.1103/PhysRevLett.106.062002

DO - 10.1103/PhysRevLett.106.062002

M3 - Article

SN - 0031-9007

VL - 106

SP - 062002/1-062002/6

JO - Physical Review Letters

JF - Physical Review Letters

IS - 6

ER -

Measurement of the Parity-Violating Longitudinal Single-Spin Asymmetry for W± Boson Production in Polarized Proton-Proton Collisions at √s=500 GeV

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