Paper
Measurement of Angular Distributions of Drell-Yan Dimuons in p + d Interaction at 800 GeV/c
Authors
L. Zhu, L. Zhu, J. Peng, P. Reimer, P. Reimer, T. Awes, M. Brooks, C. Brown, J. D. Bush, T. Carey, T. Chang, W. Cooper, C. Gagliardi, G. Garvey, D. Geesaman, E. Hawker, X. He, L. Isenhower, D. Kaplan, S. Kaufman, S. Klinksiek, D. Koetke, D. Lee, W. Lee, W. Lee, M. Leitch, N. Makins, P. McGaughey, J. Moss, B. Mueller, P. Nord, V. Papavassiliou, B. Park, G. Petitt, M. Sadler, W. Sondheim, P. Stankus, T. Thompson, R. Towell, R. Tribble, M. Vasiliev, J. Webb, J. Willis, D. Wise, G. Young
Abstract
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 polar angle and azimuthal angle have been measured over the kinematic range GeV/c, GeV/c, and . No significant cos dependence is found in these proton-induced Drell-Yan data, in contrast to the situation for pion-induced Drell-Yan. The data are compared with expectations from models which attribute the cos distribution to a QCD vacuum effect or to the presence of the transverse-momentum-dependent Boer-Mulders structure function . Constraints on the magnitude of the sea-quark structure functions are obtained.