Top quark forward-backward asymmetry from new t-channel physics

Details Top quark forward-backward asymmetry from new t-channel physics Top quark forward-backward asymmetry from new t-channel physics

2009-07-23

arxiv.org/abs/0907.4112v1

Phys.Rev.D81:015004,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 4 figures

Scientific paper

10.1103/PhysRevD.81.015004

Motivated by recent measurements of the top quark forward-backward asymmetry at the Tevatron, we study how t-channel new physics can contribute to a large value. We concentrate on a theory with an abelian gauge boson possessing flavor changing couplings between up and top quarks, but satisfies flavor physics constraints. Collider constraints are strong, but can be consistent with the aid of small flavor diagonal couplings. We find that M_Z' ~ 160 GeV can yield a total lab-frame asymmetry of ~18% without being in conflict with other observables. There are implications for future collider searches, including exotic top quark decays, like-sign top quark production, and detailed measurements of the top production cross section. An alternate model with a gauged non-Abelian flavor symmetry would have similar phenomenology, but lacks the like-sign top signal.

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