Light Singlet Fermions and Neutrino Physics
Abstract
The existence of a light singlet fermion mixed with the electron neutrino is hinted by the simultaneous explanation of various neutrino anomalies. We show that supersymmetry can provide a natural framework for the existence and the desired properties of such a fermion. Quasi Goldstone fermions (QGF) of spontaneously broken global symmetries like the Peccei-Quinn symmetry or lepton number can mix properly with the neutrinos provided the presence of the R-parity breaking term . The lightness of QGF can be a consequence of non-minimal K\"ahler potentials like that of no-scale supergravity. In order to keep R-parity, such a sterile component has to be placed in a new singlet superfield with no vacuum expectation value. In the context of the standard seesaw mechanism the lightness of such a singlet can be understood by imposing a -symmetry.
Cite
@article{arxiv.hep-ph/9508329,
title = {Light Singlet Fermions and Neutrino Physics},
author = {E. J. Chun and A. S. Yoshipura and A. Yu. Smirnov},
journal= {arXiv preprint arXiv:hep-ph/9508329},
year = {2007}
}
Comments
12 pages, Latex, 1 figure included (Talk presented at the workshop Valencia 95)