Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-04-30
Phys.Rev. D64 (2001) 073005
Physics
High Energy Physics
High Energy Physics - Phenomenology
33 pages, 9 eps figures
Scientific paper
10.1103/PhysRevD.64.073005
We address the issue of lepton flavour violation and neutrino masses in the ``fat-brane'' paradigm, where flavour changing processes are suppressed by localising different fermion field wave-functions at different positions (in the extra dimensions) in a thick brane. We study the consequences of suppressing lepton number violating charged lepton decays within this scenario for lepton masses and mixing angles. In particular, we find that charged lepton mass matrices are constrained to be quasi-diagonal. We further consider whether the same paradigm can be used to naturally explain small Dirac neutrino masses by considering the existence of three right-handed neutrinos in the brane, and discuss the requirements to obtain phenomenologically viable neutrino masses and mixing angles. Finally, we examine models where neutrinos obtain a small Majorana mass by breaking lepton number in a far away brane and show that, if the fat-brane paradigm is the solution to the absence of lepton number violating charged lepton decays, such models predict, in the absence of flavour symmetries, that charged lepton flavour violation will be observed in the next round of rare muon/tau decay experiments.
Barenboim Gabriela
Branco Gustavo C.
Gouvea Andre de
Rebelo M. N.
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