L. Isenhower

Parton Energy Loss Limits and Shadowing in Drell-Yan Dimuon Production

A precise measurement of the ratios of the Drell-Yan cross section per nucleon for an 800 GeV/{ital c} proton beam incident on Be, Fe, and W targets is reported. The behavior of the Drell-Yan ratios at small target-parton momentum fraction is well described by an existing fit to the shadowing observed in deep-inelastic scattering. The cross-section ratios as a function of the incident-parton momentum fraction set tight limits on the energy loss of quarks passing through a cold nucleus. {copyright} {ital 1999} {ital The American Physical Society}

Measurement of Angular Distributions of Drell-Yan Dimuons in p + d Interaction at 800 GeV/c

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.

Improved measurement of the anti-d / anti-u asymmetry in the nucleon sea

Measurements of the ratio of Drell-Yan yields from an 800 \rm{GeV/c} proton beam incident on liquid hydrogen and deuterium targets are reported. Approximately 360,000 Drell-Yan muon pairs remained after all cuts on the data. From these data, the ratio of anti-down (

Measurement of Upsilon production for p + p and p + d interactions at 800 GeV/c.

\bar{d}

J/psi polarization in 800-GeV p-Cu interactions.

) to anti-up (

d̄/ū asymmetry and the origin of the nucleon sea

\bar{u}

Analyzing powers for the π − p → → π 0 n reaction across the Δ ( 1232 ) resonance

) quark distributions in the proton sea is determined over a wide range in Bjorken-

Anti-d / anti-u asymmetry and the origin of the nucleon sea

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Measurement of the Absolute Drell‐Yan Dimuon Cross Section in 800 GeV/c Proton‐Proton and Proton‐Deuterium Collisions

. These results confirm previous measurements by E866 and extend them to lower

Search for flavor-changing neutral currents and lepton-family-number violation in two-body D0 decays

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