Suppressing Lepton Flavour Violation in a Soft-Wall Extra Dimension

Details Suppressing Lepton Flavour Violation in a Soft-Wall Extra Dimension Suppressing Lepton Flavour Violation in a Soft-Wall Extra Dimension

2010-02-26

arxiv.org/abs/1002.5044v2

Phys.Rev.D82:056007,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 5 figures. Version 2: Final PRD version

Scientific paper

10.1103/PhysRevD.82.056007

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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