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. Article

Adare, A, Aidala, C, Ajitanand, NN et al. (2016). 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. . PHYSICAL REVIEW D, 93(5), 10.1103/PhysRevD.93.051103

cited authors

  • Adare, A; Aidala, C; Ajitanand, NN; Akiba, Y; Akimoto, R; Alexander, J; Alfred, M; Aoki, K; Apadula, N; Aramaki, Y; Asano, H; Aschenauer, EC; Atomssa, ET; Awes, TC; Azmoun, B; Babintsev, V; Bai, M; Bai, X; Bandara, NS; Bannier, B; Barish, KN; Bassalleck, B; Bathe, S; Baublis, V; Baumann, C; Baumgart, S; Bazilevsky, A; Beaumier, M; Beckman, S; Belmont, R; Berdnikov, A; Berdnikov, Y; Black, D; Blau, DS; Bok, JS; Boyle, K; Brooks, ML; Bryslawskyj, J; Buesching, H; Bumazhnov, V; Butsyk, S; Campbell, S; Chen, CH; Chi, CY; Chiu, M; Choi, IJ; Choi, JB; Choi, S; Choudhury, RK; Christiansen, P; Chujo, T; Chvala, O; Cianciolo, V; Citron, Z; Cole, BA; Connors, M; Cronin, N; Crossette, N; Csanád, M; Csörgo, T; Dairaku, S; Danley, TW; Datta, A; Daugherity, MS; David, G; Deblasio, K; Dehmelt, K; Denisov, A; Deshpande, A; Desmond, EJ; Dietzsch, O; Ding, L; Dion, A; Diss, PB; Do, JH; Donadelli, M; D'Orazio, L; Drapier, O; Drees, A; Drees, KA; Durham, JM; Durum, A; Edwards, S; Efremenko, YV; Engelmore, T; Enokizono, A; En'Yo, H; Esumi, S; Eyser, KO; Fadem, B; Feege, N; Fields, DE; Finger, M; Fleuret, F; Fokin, SL; Frantz, JE; Franz, A; Frawley, AD; Fukao, Y

authors

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.

publication date

  • March 23, 2016

published in

Digital Object Identifier (DOI)

volume

  • 93

issue

  • 5