The Effects of a New Vector Boson on the Top Quark Cross Section at the Tevatron

Abstract

It has recently been shown that a new neutral vector boson $Z^{\prime }$, with a mass of order 1~TeV and weak couplings to quarks only, could explain both the anomalous values of $R_b$ and $R_c$ and the apparent excess of large $E_T$ jet events measured by the CDF collaboration. We calculate the effects of $Z^{\prime }$ exchange on the $t\bar{t}$ production cross section at Tevatron $p\bar{p}$ collider energies, including next-to-leading-order QCD corrections. We find a significant enhancement of the cross section and study the resulting $t\bar{t}$ invariant mass distribution, which could provide a decisive test of the $Z^{\prime }$ model.

arXiv comment7 pages, LATEX, 4 figures included

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• Constraints on leptophobic Z' models from electroweak experiments
• Like-sign dilepton signals from a leptophobic Z' boson
• Leptophobic Character of the Z' in an SU(3)_C x SU(3)_L x U(1)_X model