Measurement of parity-violating spin asymmetries in W ± production at midrapidity in longitudinally polarized p +p collisions MEASUREMENT of PARITY-VIOLATING SPIN ... A. ADARE et al.

(PHENIX Collaboration)

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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 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.

Original languageEnglish
Article number051103
JournalPhysical Review D
Volume93
Issue number5
DOIs
Publication statusPublished - 2016 Mar 23

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partons
parity
asymmetry
collisions
distribution functions
transverse momentum
center of mass
positrons
bosons
luminosity
quarks
protons
probes
decay
electrons
energy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

@article{d11c771bd2b9453088baf02a75a6b23d,
title = "Measurement of parity-violating spin asymmetries in W ± production at midrapidity in longitudinally polarized p +p collisions MEASUREMENT of PARITY-VIOLATING SPIN ... A. ADARE et al.",
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 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.",
author = "{(PHENIX Collaboration)} and A. Adare and C. Aidala and Ajitanand, {N. N.} and Y. Akiba and R. Akimoto and J. Alexander and M. Alfred and K. Aoki and N. Apadula and Y. Aramaki and H. Asano and Aschenauer, {E. C.} and Atomssa, {E. T.} and Awes, {T. C.} and B. Azmoun and V. Babintsev and M. Bai and X. Bai and Bandara, {N. S.} and B. Bannier and Barish, {K. N.} and B. Bassalleck and S. Bathe and V. Baublis and C. Baumann and S. Baumgart and A. Bazilevsky and M. Beaumier and S. Beckman and R. Belmont and A. Berdnikov and Y. Berdnikov and D. Black and Blau, {D. S.} and Bok, {J. S.} and K. Boyle and Brooks, {M. L.} and J. Bryslawskyj and H. Buesching and V. Bumazhnov and S. Butsyk and S. Campbell and Chen, {C. H.} and Chi, {C. Y.} and M. Chiu and Choi, {I. J.} and Choi, {J. B.} and S. Choi and Choudhury, {R. K.} and P. Christiansen",
year = "2016",
month = "3",
day = "23",
doi = "10.1103/PhysRevD.93.051103",
language = "English",
volume = "93",
journal = "Physical Review D",
issn = "2470-0010",
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TY - JOUR

T1 - Measurement of parity-violating spin asymmetries in W ± production at midrapidity in longitudinally polarized p +p collisions MEASUREMENT of PARITY-VIOLATING SPIN ... A. ADARE et al.

AU - (PHENIX Collaboration)

AU - Adare, A.

AU - Aidala, C.

AU - Ajitanand, N. N.

AU - Akiba, Y.

AU - Akimoto, R.

AU - Alexander, J.

AU - Alfred, M.

AU - Aoki, K.

AU - Apadula, N.

AU - Aramaki, Y.

AU - Asano, H.

AU - Aschenauer, E. C.

AU - Atomssa, E. T.

AU - Awes, T. C.

AU - Azmoun, B.

AU - Babintsev, V.

AU - Bai, M.

AU - Bai, X.

AU - Bandara, N. S.

AU - Bannier, B.

AU - Barish, K. N.

AU - Bassalleck, B.

AU - Bathe, S.

AU - Baublis, V.

AU - Baumann, C.

AU - Baumgart, S.

AU - Bazilevsky, A.

AU - Beaumier, M.

AU - Beckman, S.

AU - Belmont, R.

AU - Berdnikov, A.

AU - Berdnikov, Y.

AU - Black, D.

AU - Blau, D. S.

AU - Bok, J. S.

AU - Boyle, K.

AU - Brooks, M. L.

AU - Bryslawskyj, J.

AU - Buesching, H.

AU - Bumazhnov, V.

AU - Butsyk, S.

AU - Campbell, S.

AU - Chen, C. H.

AU - Chi, C. Y.

AU - Chiu, M.

AU - Choi, I. J.

AU - Choi, J. B.

AU - Choi, S.

AU - Choudhury, R. K.

AU - Christiansen, P.

PY - 2016/3/23

Y1 - 2016/3/23

N2 - 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.

AB - 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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U2 - 10.1103/PhysRevD.93.051103

DO - 10.1103/PhysRevD.93.051103

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JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

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