Top quark forward-backward asymmetry and same-sign top quark pairs

Edmond L. Berger*, Qing Hong Cao, Chuan Ren Chen, Chong Sheng Li, Hao Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

94 Citations (Scopus)


The top quark forward-backward asymmetry measured at the Tevatron collider shows a large deviation from standard model expectations. Among possible interpretations, a nonuniversal Z 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 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 no tt signal is observed with 1fb-1 of integrated luminosity, then a nonuniversal Z alone cannot explain the Tevatron forward-backward asymmetry.

Original languageEnglish
Article number201801
JournalPhysical Review Letters
Issue number20
Publication statusPublished - 2011 May 17
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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