Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-04-20
JHEP 1107:122,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
28 pages, 4 figures. Version to be published. Some typos corrected. Improved figures 3 and 4
Scientific paper
10.1007/JHEP07(2011)122
We reconsider the possibility that Majorana masses for the three known neutrinos are generated radiatively by the presence of a fourth generation and one right-handed neutrino with Yukawa couplings and a Majorana mass term. We find that the observed light neutrino mass hierarchy is not compatible with low energy universality bounds in this minimal scenario, but all present data can be accommodated with five generations and two right-handed neutrinos. Within this framework, we explore the parameter space regions which are currently allowed and could lead to observable effects in neutrinoless double beta decay, $\mu - e$ conversion in nuclei and $\mu \rightarrow e \gamma$ experiments. We also discuss the detection prospects at LHC.
Aparici Alberto
Herrero-García Juan
Rius Nuria
Santamaria Arcadi
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