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Zhu, L Y; Reimer, P E; Mueller, B A; 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; Howell, D E; 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; Nord, P M; Papavassiliou, V; Park, B K; Petitt, G; Peng, J C; 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; Winter, P; Wise, D K; Yin, Y; Young, G R
Physical review letters, 02/2008, Letnik: 100, Številka: 6Journal Article
We report a high statistics measurement of Upsilon production with an 800 GeV/c proton beam on hydrogen and deuterium targets. The dominance of the gluon-gluon fusion process for Upsilon production at this energy implies that the cross section ratio, sigma(p+d-->Upsilon)/2sigma(p+p-->Upsilon), is sensitive to the gluon content in the neutron relative to that in the proton. Over the kinematic region 0<x(F)<0.6, this ratio is found to be consistent with unity, in striking contrast to the behavior of the Drell-Yan cross section ratio sigma(p+d)(DY)/2sigma(p+p)(DY). This result shows that the gluon distributions in the proton and neutron are very similar. The Upsilon production cross sections are also compared with the p+d and p+Cu cross sections from earlier measurements.
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