Wednesday, April 10, 2013

1304.2675 (Sven Faller et al.)

Minimal Flavour Violation and Anomalous Top Decays    [PDF]

Sven Faller, Stefan Gadatsch, Thomas Mannel
Top quark physics at the LHC may open a window to physics beyond the standard model and even lead us to an understanding of the phenomenon "flavour". However, current flavour data is a strong hint that no "new physics" with a generic flavour structure can be expected in the TeV scale. In turn, if there is "new physics" at the TeV scale, it must be "minimally flavour violating". This has become a widely accepted assumption for "new physics" models. In this paper we propose a way to test the concept of minimal flavour violation for the anomalous charged $Wtq$, $q\in\{d,s,b\}$, and flavour-changing $Vtq$, $q\in\{u,c\}$ and $V\in\{Z,\gamma,g\}$, couplings within an effective field theory framework, i.e. in a model independent way. We perform a spurion analysis of our effective field theory approach and calculate the decay rates for the anomalous top-quark decays in terms of the effective couplings for different helicities by using a two-Higgs doublet model of type II (2HDM-II), under the assumption that the top-quark is produced at a high energy collision and decays as a quasi-free particle.
View original: http://arxiv.org/abs/1304.2675

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