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arXiv · 1002.5044

Suppressing Lepton Flavour Violation in a Soft-Wall Extra Dimension

Michael Atkins·Stephan J. Huber
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Abstract

A soft-wall warped extra dimension allows one to relax the tight constraints imposed by electroweak data in conventional Randall-Sundrum models. We investigate a setup, where the lepton flavour structure of the Standard Model is realised by split fermion locations. Bulk fermions with general locations are not analytically tractable in a soft-wall background, so we follow a numerical approach to perform the Kaluza-Klein reduction. Lepton flavour violation is induced by the exchange of Kaluza-Klein gauge bosons. We find that rates for processes such as muon-electron conversion are significantly reduced compared to hard-wall models, allowing for a Kaluza-Klein scale as low as 2 TeV. Accommodating small neutrino masses forces one to introduce a large hierarchy of scales into the model, making pressing the question of a suitable stabilisation mechanism.

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Michael Atkins, Stephan J. Huber. 2011-01-19. Suppressing Lepton Flavour Violation in a Soft-Wall Extra Dimension. https://doi.org/10.1103/physrevd.82.056007

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