Heavy neutrino threshold effects in low energy phenomenology
Abstract
Right-handed neutrinos with mass of O(10 12 - 10 13) GeV are required to implement the see-saw mechanism and generate neutrino masses capable of playing a role in structure formation. Moreover models of fermion masses often relate the Yukawa couplings involving these neutrinos to the up-quark Yukawa couplings. Here we study the effects of such couplings on the radiative corrections to quark masses. We find that b - τ equality at MGUT may still give the correct mb/ mτ-ratio at low energies, but only if there is large μ - τ mixing in the charged leptonic sector. We propose specific mass matrix "textures" dictated by a U(1) family symmetry whose structure preserves mb = mτ at MGUT. In these schemes, due to the large νμ - ντ mixing, it is possible to give a simultaneous solution to the solar neutrino deficit and the atmospheric neutrino problem.
- Publication:
-
Nuclear Physics B
- Pub Date:
- February 1995
- DOI:
- 10.1016/0550-3213(95)00377-5
- arXiv:
- arXiv:hep-ph/9505402
- Bibcode:
- 1995NuPhB.454...25L
- Keywords:
-
- High Energy Physics - Phenomenology
- E-Print:
- 22 pages, latex file, including 8 latex figures. Revised version (typos corrected, references added), to be published in Nucl. Phys. B