Double beta decay and the extra-dimensional seesaw mechanism

Details Double beta decay and the extra-dimensional seesaw mechanism Double beta decay and the extra-dimensional seesaw mechanism

2004-02-06

arxiv.org/abs/hep-ph/0402071v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 2 figures, talk presented by H. Paes at AHEP-2003, Valencia, Spain

Scientific paper

We study the model-building conditions under which an observable 0vBB decay signal is predicted due to Kaluza-Klein singlet neutrinos in theories with large extra dimensions. Our analysis is based on 5-dimensional singlet-neutrino models compactified on an S^1/Z_2 orbifold, where the Standard-Model fields are localized on a 3-brane. We show that sizeable 0vBB rates within the above minimal 5-dimensional framework would require a non-vanishing shift of the 3-brane from the orbifold fixed points by an amount smaller than the typical scale 100 inverse MeV characterizing the Fermi nuclear momentum. The resulting 5-dimensional models predict a sizeable effective Majorana-neutrino mass that could be several orders of magnitude larger than the light neutrino masses.

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