Universal Constraints on Low-Energy Flavour Models

Details Universal Constraints on Low-Energy Flavour Models Universal Constraints on Low-Energy Flavour Models

2012-04-05

arxiv.org/abs/1204.1275v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 3 figures

Scientific paper

It is pointed out that in a general class of flavour models one can identify certain universally present FCNC operators, induced by the exchange of heavy flavour messengers. Their coefficients depend on the rotation angles that connect flavour and fermion mass basis. The lower bounds on the messenger scale are derived using updated experimental constraints on the FCNC operators. The obtained bounds are different for different operators and in addition they depend on the chosen set of rotations. Given the sensitivity expected in the forthcoming experiments, the present analysis suggests interesting room for discovering new physics. As the highlights emerge the leptonic processes, $\mu\rightarrow e\gamma$, $\mu\rightarrow eee$ and $\mu\rightarrow e$ conversion in nuclei.

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