Lepton flavour violation in a left-right symmetric model
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# Lepton flavour violation in a left-right symmetric model

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 Pastor Carpi, Sergio; Rindani, Saurabh D.; Furtado Valle, José Wagner Perfil Aquest document és un/a article, creat/da en: 1999 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. Pastor Carpi, Sergio Rindani, Saurabh D. Furtado Valle, José Wagner 1999 Lepton flavour violation in a left-right symmetric model Journal of High Energy Physics 1999 5 012 http://dx.doi.org/10.1088/1126-6708/1999/05/012