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Absolute Drell-Yan Dimuon Cross Sections in 800 GeV/c pp and pd Collisions

2003; Cornell University; Linguagem: Inglês

E Fnal, J. C. Webb, T. C. Awes, M. L. Brooks, C. N. Brown, J. D. Bush, T. A. Carey, T. H. Chang, W. E. Cooper, C. A. Gagliardi, G. T. Garvey, D. F. Geesaman, E. Hawker, X. He, L. Isenhower, Daniel Kaplan, S. Kaufman, D. D. Koetke, D.M. Lee, W.M. Lee, M. J. Leitch, N. C. R. Makins, P. L. McGaughey, J. M. Moss, B. Mueller, P. M. Nord, V. Papavassiliou, B.K. Park, J.-C. Peng, G. Petitt, P. E. Reimer, M. E. Sadler, W. E. Sondheim, P. W. Stankus, T. N. Thompson, R. S. Towell, R. E. Tribble, M. A. Vasiliev, J. L. Willis, Derek K. Wise, G. R. Young,

Quantum Chromodynamics and Particle Interactions

The Fermilab E866/NuSea Collaboration has measured the Drell-Yan dimuon cross sections in 800 GeV/$c$ $pp$ and $pd$ collisions. This represents the first measurement of the Drell-Yan cross section in $pp$ collisions over a broad kinematic region and the most extensive study to date of the Drell-Yan cross section in $pd$ collisions. The results indicate that recent global parton distribution fits provide a good description of the light antiquark sea in the nucleon over the Bjorken-$x$ range $0.03 \lesssim x < 0.15$, but overestimate the valence quark distributions as $x \to 1$.