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 language | English |
|---|---|
| Article number | 051103 |
| Journal | Physical Review D |
| Volume | 93 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2016 Mar 23 |
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)
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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).
In: Physical Review D, Vol. 93, No. 5, 051103, 23.03.2016.Research output: Contribution to journal › Article
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
M3 - Article
AN - SCOPUS:84962440767
VL - 93
JO - Physical Review D
JF - Physical Review D
SN - 2470-0010
IS - 5
M1 - 051103
ER -