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

Abstract

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 $x\to 1$.

submitted to Phys. Rev. Lett

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