High Energy Theory Seminar

19 November 2010

Elizabeth Simmons (Michigan State University)

Axigluons vs. A^t_FB

Abstract:

Models with an SU(3) × SU(3) color group have been proposed to explain the FNAL observations of a positive enhancement of the top quark forward-backward asymmetry relative to standard model predictions. We show that this class of models cannot explain the asymmetry while remaining consistent with other data, including flavor-changing neutral currents in the b-quark sector. Along the way, we examine specific models, phenomenological approaches, and the implications of new LHC bounds on colored gauge bosons. Finally, we consider the impact of extending the color group to SU(3) × SU(3) × SU(3), as one might if embedding the model in an extra-dimensional framework.

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