Scalar-mediated $t\bar t$ forward-backward asymmetry

Details Scalar-mediated $t\bar t$ forward-backward asymmetry Scalar-mediated $t\bar t$ forward-backward asymmetry

2011-07-21

arxiv.org/abs/1107.4350v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

22 pages, 1 figure and 2 tables. v2: Corrected Eqs.(50,51,74), adapted Fig.1, Tab.1 and relevant discussions. Extended discuss

Scientific paper

A large forward-backward asymmetry in $t\bar t$ production, for large invariant mass of the $t\bar t$ system, has been recently observed by the CDF collaboration. Among the scalar mediated mechanisms that can explain such a large asymmetry, only the t-channel exchange of a color-singlet weak-doublet scalar is consistent with both differential and integrated $t\bar t$ 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 $t\bar t$ production cross section is expected at the LHC.

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