Associated Production of Upsilon and Weak Gauge Bosons at the Tevatron

Abstract

We calculate the rate of production of W+Upsilon and Z+Upsilon at the Tevatron. We find the cross sections at a center-of-mass energy of 1.8 TeV to be roughly 450 pb for W+Upsilon and 150 pb for Z+Upsilon. The dominant production mechanism involves the binding of a color-octet b-bbar pair into a P-wave bottomonium state which subsequently decays into Upsilon. The purely leptonic decay modes of Upsilon, W, and Z provide signatures with small backgrounds. In Run I of the Tevatron, the number of events in the purely leptonic decay channels before allowing for detector acceptances and efficiencies should be about 500 for W+Upsilon and about 60 for Z+Upsilon. We conclude that W+Upsilon events may be observable in the Run I data.

Figures (1)

• Figure 1: The invariant mass distributions $d \sigma/dM_{W \Upsilon}$ (upper curve) and $d \sigma/dM_{Z \Upsilon}$ (lower curve) for the production of $W^\pm + \Upsilon$ and $Z^0 + \Upsilon$ in $p p$ collisions at center-of-mass energy 14 TeV.