Asymmetric Left-Right Model and the Top Pair Forward-Backward Asymmetry

Abstract

The forward-backward asymmetry measurement in top-pair production at the Tevatron is about $2\sigma$ from the Standard Model prediction. We propose an asymmetric left-right model, which includes a $W^{\prime }$ boson with a right-handed coupling of down to top quark, and a $Z^{\prime }$ boson with diagonal couplings to the up, top, and down quarks with $M_{W^{\prime }}\approx 175$ GeV and $M_{Z^{\prime }}\approx 900$ GeV. The model accounts for the asymmetry while remaining consistent with the top-pair total cross-section and invariant mass distribution.

Comments: 7 pages, 6 figures; version published in Phys. Rev. D