Top Quark Forward-Backward Asymmetry and Same-Sign Top Quark Pairs

Abstract

The top quark forward-backward asymmetry measured at the Tevatron collider shows a large deviation from standard model expectations. Among possible interpretations, a non-universal $Z^{\prime }$ model is of particular interest as it naturally predicts a top quark in the forward region of large rapidity. To reproduce the size of the asymmetry, the couplings of the $Z^{\prime }$ to standard model quarks must be large, inevitably leading to copious production of same-sign top quark pairs at the energies of the Large Hadron Collider (LHC). We explore the discovery potential for $tt$ and $ttj$ production in early LHC experiments at 7-8 TeV and conclude that if {\it no} $tt$ signal is observed with 1 fb${}^{-1}$ of integrated luminosity, then a non-universal $Z^{\prime }$ alone cannot explain the Tevatron forward-backward asymmetry.

Tevatron limit from same-sign tt search added

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• Top quark asymmetry from a non-Abelian horizontal symmetry
• No like-sign tops at Tevatron: Constraints on extended models and implications for the t tbar asymmetry
• Asymmetries in top quark pair production at hadron colliders
• Top Quark Physics at the LHC: A Review of the First Two Years
• Leptophobic Z' Boson and Parity-Violating eD Scattering
• Search for top quark flavour changing neutral currents in same-sign top quark production
• Same-sign Tops: A Powerful Diagnostic Test for Models of New Physics
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• NLO QCD predictions for off-shell $t\bar{t}W$ production in association with a light jet at the LHC
• Signs of Tops from Highly Mixed Stops
• Signature of same-sign top pair production mediated by a nonuniversal $Z^{\prime }$ with QCD next-to-leading accuracy at the LHC
• Top Quark Polarization and the Search for New Physics