Derek K. Wise

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 (

Teleparallel Gravity as a Higher Gauge Theory

\bar{d}

p-form electromagnetism on discrete spacetimes *

) to anti-up (

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

\bar{u}

Lifting general relativity to observer space

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

Spontaneously broken Lorentz symmetry for Hamiltonian gravity

x

Linking covariant and canonical general relativity via local observers

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

d̄/ū asymmetry and the origin of the nucleon sea

x

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

. From these data,