Massive Spin-2 States as the Origin of the Top Quark Forward-Backward Asymmetry

Details Massive Spin-2 States as the Origin of the Top Quark Forward-Backward Asymmetry Massive Spin-2 States as the Origin of the Top Quark Forward-Backward Asymmetry

2012-03-09

arxiv.org/abs/1203.2183v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

added discussion of single-top production, added references, matches version submitted to JHEP

Scientific paper

We show that the anomalously large top quark forward-backward asymmetry observed by CDF and D\O\, can naturally be accommodated in models with flavor-violating couplings of a new massive spin-2 state to quarks. Regardless of its origin, the lowest-order couplings of a spin-2 boson to fermions are analogous to the coupling of the graviton to energy/momentum, leading to strong sensitivity of the effects associated with its virtual exchange to the energy scales at hand. Precisely due to this fact, the observed dependence of the asymmetry on the $t\bar t$ invariant mass fits nicely into the proposed framework. In particular, we find a vast parameter space which can lead to the central value for the observed forward-backward asymmetry in the high mass bin, while being in accord with all of the existing experimental constraints.

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