@Article{Aparici_etal2012,
author="Aparici, A.
and Herrero-Garcia, J.
and Rius, N.
and Santamaria, A.",
title="On the nature of the fourth generation neutrino and its implications",
journal="Journal of High Energy Physics",
year="2012",
publisher="Springer",
volume="07",
number="7",
pages="030--31pp",
optkeywords="Beyond Standard Model; Neutrino Physics",
abstract="We consider the neutrino sector of a Standard Model with four generations. While the three light neutrinos can obtain their masses from a variety of mechanisms with or without new neutral fermions, fourth-generation neutrinos need at least one new relatively light right-handed neutrino. If lepton number is not conserved this neutrino must have a Majorana mass term whose size depends on the underlying mechanism for lepton number violation. Majorana masses for the fourth-generation neutrinos induce relative large two-loop contributions to the light neutrino masses which could be even larger than the cosmological bounds. This sets strong limits on the mass parameters and mixings of the fourth-generation neutrinos.",
optnote="WOS:000307298400030",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=1157), last updated on Thu, 11 Oct 2012 11:15:22 +0000",
issn="1126-6708",
doi="10.1007/JHEP07(2012)030",
opturl="http://arxiv.org/abs/1204.1021",
opturl="https://doi.org/10.1007/JHEP07(2012)030",
archivePrefix="arXiv",
eprint="1204.1021",
language="English"
}