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Peter Christiansen Profile

Peter Christiansen

Professor

Peter Christiansen Profile

Measurement of parity-violating spin asymmetries in W ± production at midrapidity in longitudinally polarized p +p collisions

Author

  • A. Adare
  • C. Aidala
  • N. N. Ajitanand
  • Y. Akiba
  • R. Akimoto
  • J. Alexander
  • M. Alfred
  • K. Aoki
  • N. Apadula
  • Y. Aramaki
  • H. Asano
  • E. C. Aschenauer
  • E. T. Atomssa
  • T. C. Awes
  • B. Azmoun
  • V. Babintsev
  • M. Bai
  • N. S. Bandara
  • B. Bannier
  • K. N. Barish
  • B. Bassalleck
  • S. Bathe
  • V. Baublis
  • C. Baumann
  • S. Baumgart
  • A. Bazilevsky
  • M. Beaumier
  • R. Belmont
  • A. Berdnikov
  • Y. Berdnikov
  • D. Black
  • D. S. Blau
  • J. S. Bok
  • K. Boyle
  • M. L. Brooks
  • J. Bryslawskyj
  • H. Buesching
  • V. Bumazhnov
  • S. Butsyk
  • S. Campbell
  • C. Y. Chi
  • M. Chiu
  • I. J. Choi
  • S. Choi
  • R. K. Choudhury
  • P. Christiansen
  • T. Chujo
  • A. Oskarsson
  • D. Silvermyr
  • E. Stenlund
Show all

Summary, in English

We present midrapidity measurements from the PHENIX experiment of large parity-violating single-spin asymmetries of high transverse momentum electrons and positrons from W±/Z decays, produced in longitudinally polarized p+p collisions at center of mass energies of s=500 and 510 GeV. These asymmetries allow direct access to the antiquark polarized parton distribution functions due to the parity-violating nature of the W-boson coupling to quarks and antiquarks. The results presented are based on data collected in 2011, 2012, and 2013 with an integrated luminosity of 240 pb-1, which exceeds previous PHENIX published results by a factor of more than 27. These high Q2 data probe the parton structure of the proton at W mass scale and provide an important addition to our understanding of the antiquark parton helicity distribution functions at an intermediate Bjorken x value of roughly MW/s=0.16.

Department/s

  • Particle and nuclear physics
  • eSSENCE: The e-Science Collaboration

Publishing year

2016-03-23

Language

English

Publication/Series

Physical Review D

Volume

93

Issue

5

Document type

Journal article

Publisher

American Physical Society

Topic

  • Subatomic Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 2470-0010