Double-spin asymmetry of electrons from heavy-flavor decays in p+p collisions at √s=200 GeV
We report on the first measurement of the double-spin asymmetry, A LL, of electrons from the decays of hadrons containing heavy flavor in longitudinally polarized p+p collisions at √s=200 GeV for p T=0.5 to 3.0 GeV/c. The asymmetry was measured at midrapidity (|η|<0.35) with the PHENIX detector at the Relativistic Heavy Ion Collider. The measured asymmetries are consistent with zero within the statistical errors. We obtained a constraint for the polarized gluon distribution in the proton of(1σ) based on a leading-order perturbative quantum chromodynamics model, using the measured asymmetry. © 2013 American Physical Society.
Adare, A; Afanasiev, S; Aidala, C; Ajitanand, NN; Akiba, Y; Akimoto, R; Al-Ta'Ani, H; Alexander, J; 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; 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; Drapier, O; Drees, A; Drees, KA; Durham, JM; Durum, A; D'Orazio, L; Efremenko, YV; Engelmore, T; Enokizono, A; En'Yo, H; Esumi, S; Fadem, B; Fields, DE; 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; Grau, N
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