Scalar-mediated tt̄ forward-backward asymmetry

Kfir Blum*, Yonit Hochberg, Yosef Nir

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


A large forward-backward asymmetry in tt̄ production, for large invariant mass of the tt̄ system, has been recently observed by the CDF collaboration. Among the scalar mediated mechanisms that can explain such a large asymmetry, all colored representations are inconsistent by more than 2σ with at least one other top-related measurement. In contrast, the t-channel exchange of a color-singlet weak-doublet scalar is consistent with the differential and with the integrated tt̄ cross section measurements. Constraints from flavor changing processes dictate a very specific structure for the Yukawa couplings of such a new scalar. No sizable deviation in the differential or integrated tt̄ production cross section is expected at the LHC.

Original languageAmerican English
Article number124
JournalJournal of High Energy Physics
Issue number10
StatePublished - 2011
Externally publishedYes


  • Phenomenological models


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