Cross section and parity-violating spin asymmetries of W± boson production in polarized p+p collisions at √s=500GeV Article

Adare, A, Afanasiev, S, Aidala, C et al. (2011). Cross section and parity-violating spin asymmetries of W± boson production in polarized p+p collisions at √s=500GeV . PHYSICAL REVIEW LETTERS, 106(6), 10.1103/PhysRevLett.106.062001

cited authors

  • Adare, A; Afanasiev, S; Aidala, C; Ajitanand, NN; Akiba, Y; Akimoto, R; Alexander, J; Al-Ta'Ani, H; Andrews, KR; Angerami, A; Aoki, K; Apadula, N; Appelt, E; Aramaki, Y; Armendariz, R; Aschenauer, EC; Awes, TC; Azmoun, B; Babintsev, V; Bai, M; Bannier, B; Barish, KN; Bassalleck, B; Basye, AT; Bathe, S; Baublis, V; Baumann, C; Bazilevsky, A; Belmont, R; Ben-Benjamin, J; Bennett, R; Berdnikov, A; Berdnikov, Y; Blau, DS; Bok, JS; Boyle, K; Brooks, ML; Broxmeyer, D; Buesching, H; Bumazhnov, V; Bunce, G; Butsyk, S; Campbell, S; Caringi, A; Castera, P; Chen, CH; Chi, CY; Chiu, M; Choi, IJ; Choi, JB; Choudhury, RK; Christiansen, P; Chujo, T; Chvala, O; Cianciolo, V; Citron, Z; Cole, BA; Conesa Del Valle, Z; Connors, M; Csanád, M; Csörgo, T; Dairaku, S; Datta, A; David, G; Dayananda, MK; Denisov, A; Deshpande, A; Desmond, EJ; Dharmawardane, KV; Dietzsch, O; Dion, A; Donadelli, M; D'Orazio, L; Drapier, O; Drees, A; Drees, KA; Durham, JM; Durum, A; Efremenko, YV; Engelmore, T; Enokizono, A; En'Yo, H; Esumi, S; Fadem, B; Fields, DE; Finger, M; Finger, M; Fleuret, F; Fokin, SL; Frantz, JE; Franz, A; Frawley, AD; Fukao, Y; Fusayasu, T; Garishvili, I; Glenn, A; Gong, X; Gonin, M; Goto, Y; Granier De Cassagnac, R

authors

abstract

  • Large parity-violating longitudinal single-spin asymmetries ALe +=-0.86-0.14+0.30 and ALe-=0.88-0.71+0.12 are observed for inclusive high transverse momentum electrons and positrons in polarized p+p collisions at a center-of-mass energy of √s=500GeV with the PHENIX detector at RHIC. These e± come mainly from the decay of W± and Z0 bosons, and their asymmetries directly demonstrate parity violation in the couplings of the W± to the light quarks. The observed electron and positron yields were used to estimate W ± boson production cross sections for the e± channels of σ(pp→W+X)×BR(W+→e +νe)=144.1±21.2(stat)-10.3+3.4(syst)±21. 6(norm)pb, and σ(pp→W-X)×BR(W -→e-ν̄e)=31.7±12.1(stat)-8. 2+10.1(syst)±4.8(norm)pb. © 2011 American Physical Society.

publication date

  • February 11, 2011

published in

Digital Object Identifier (DOI)

volume

  • 106

issue

  • 6