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

Understand

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 $W'$ boson with a right-handed coupling of down to top quark, and a $Z'$ boson with diagonal couplings to the up, top, and down quarks with $M_{W'}\approx175$ GeV and $M_{Z'}\approx 900$ GeV.
• The model accounts for the asymmetry while remaining consistent with the top-pair total cross-section and invariant mass distribution.