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

Adare, A. ; Aidala, C. ; Ajitanand, N. N. ; Akiba, Y. ; Akimoto, R. ; Alexander, J. ; Alfred, M. ; Aoki, K. ; Apadula, N. and Aramaki, Y. , et al. (2016) In Physical Review D 93(5).
Abstract

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... (More)

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.

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@article{a0edb62f-0102-4028-a80a-d084e5bf6bda,
  abstract     = {{<p>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.</p>}},
  author       = {{Adare, A. and Aidala, C. and Ajitanand, N. N. and Akiba, Y. and Akimoto, R. and Alexander, J. and Alfred, M. and Aoki, K. and Apadula, N. and Aramaki, Y. and Asano, H. and Aschenauer, E. C. and Atomssa, E. T. and Awes, T. C. and Azmoun, B. and Babintsev, V. and Bai, M. and Bandara, N. S. and Bannier, B. and Barish, K. N. and Bassalleck, B. and Bathe, S. and Baublis, V. and Baumann, C. and Baumgart, S. and Bazilevsky, A. and Beaumier, M. and Belmont, R. and Berdnikov, A. and Berdnikov, Y. and Black, D. and Blau, D. S. and Bok, J. S. and Boyle, K. and Brooks, M. L. and Bryslawskyj, J. and Buesching, H. and Bumazhnov, V. and Butsyk, S. and Campbell, S. and Chi, C. Y. and Chiu, M. and Choi, I. J. and Choi, S. and Choudhury, R. K. and Christiansen, P. and Chujo, T. and Oskarsson, A. and Silvermyr, D. and Stenlund, E.}},
  issn         = {{2470-0010}},
  language     = {{eng}},
  month        = {{03}},
  number       = {{5}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review D}},
  title        = {{Measurement of parity-violating spin asymmetries in W ± production at midrapidity in longitudinally polarized p +p collisions}},
  url          = {{http://dx.doi.org/10.1103/PhysRevD.93.051103}},
  doi          = {{10.1103/PhysRevD.93.051103}},
  volume       = {{93}},
  year         = {{2016}},
}