Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-10-11
Phys.Lett. B498 (2001) 230-236
Physics
High Energy Physics
High Energy Physics - Phenomenology
Revised version. Discussion of Supernova constraint expanded with added reference. LaTeX, 14 pages
Scientific paper
10.1016/S0370-2693(00)01400-3
Small Dirac masses for neutrinos are natural in models with singlet fermions in large extra dimensions with quantum gravity scale M_{\ast} \sim 1- 100 TeV. We study two modifications of the minimal model in order to obtain the mass scale relevant for atmospheric neutrino oscillations with at most O(1) higher-dimensional Yukawa couplings and with M_{\ast} \sim a few TeV. 1) In models with singlet fermions in smaller number of extra dimensions than gravity, we find that the effects on BR (\mu \to e \gamma) and on charged-current universality in \pi^- \to e \bar{\nu}, \mu \bar{\nu} decays are suppressed as compared to that in the minimal model with neutrino and gravity in the same space. 2) If small Dirac masses for the singlets are added along with lepton number violating couplings, then the mass scales and mixing angles for neutrino oscillations can be different from those relevant for \mu \to e \gamma and \pi^- \to e \bar{\nu}, \mu \bar{\nu}. Thus, in both modified models the constraints on M_{\ast} from BR (\mu \to e \gamma) and \pi^- \to e \bar{\nu}, \mu \bar{\nu} decays can be significantly relaxed. Furthermore, constraints from supernova 1987a strongly disfavor oscillations of active neutrinos to sterile neutrinos in both the minimal and the modified models.
Agashe Kaustubh
Wu Guo-Hong
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