Lepton Flavour Violation in a Left-Right Symmetric Model

Details Lepton Flavour Violation in a Left-Right Symmetric Model Lepton Flavour Violation in a Left-Right Symmetric Model

1997-05-22

arxiv.org/abs/hep-ph/9705394v2

JHEP 9905:012,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 16 pages, 3 PS figures, uses JHEP.cls, published version

Scientific paper

10.1088/1126-6708/1999/05/012

We consider in this paper a Left-Right symmetric gauge model in which a global lepton-number-like symmetry is introduced and broken spontaneously at a scale that could be as low as 10^4 GeV or so. The corresponding physical Nambu-Goldstone boson, which we call majoron and denote J, can have tree-level flavour-violating couplings to the charged fermions, leading to sizeable majoron-emitting lepton-flavour-violating weak decays. We consider explicitly a leptonic variant of the model and show that the branching ratios for \mu -> e+J, \tau -> e + J and \tau -> \mu + J decays can be large enough to fall within the sensitivities of future \mu and \tau factories. On the other hand the left-right gauge symmetry breaking scale may be as low as few TeV.

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