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Zhu, L Y; Peng, J C; Reimer, P E; Awes, T C; Brooks, M L; Brown, C N; Bush, J D; Carey, T A; Chang, T H; Cooper, W E; Gagliardi, C A; Garvey, G T; Geesaman, D F; Hawker, E A; He, X C; Isenhower, L D; Kaplan, D M; Kaufman, S B; Klinksiek, S A; Koetke, D D; Lee, D M; Lee, W M; Leitch, M J; Makins, N; McGaughey, P L; Moss, J M; Mueller, B A; Nord, P M; Papavassiliou, V; Park, B K; Petitt, G; Sadler, M E; Sondheim, W E; Stankus, P W; Thompson, T N; Towell, R S; Tribble, R E; Vasiliev, M A; Webb, J C; Willis, J L; Wise, D K; Young, G R
Physical review letters, 08/2007, Letnik: 99, Številka: 8Journal Article
We report a measurement of the angular distributions of Drell-Yan dimuons produced using an 800 GeV/c proton beam on a deuterium target. The muon angular distributions in the dilepton rest frame have been measured over the kinematic range 4.5<m{mu mu}<15 GeV/c{2}, 0<p{T}<4 GeV/c, and 0<x{F}<0.8. No significant cos2phi dependence is found in these proton-induced Drell-Yan data, in contrast with the situation for pion-induced Drell-Yan data. The data are compared with expectations from models which attribute the cos2phi distribution to a QCD vacuum effect or to the presence of the transverse-momentum-dependent Boer-Mulders structure function h{1}{perpendicular}. Constraints on the magnitude of the sea-quark h{1}{perpendicular} structure functions are obtained.
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