Neutrino Masses and $b-τ$ unification in the Supersymmetric Standard Model

Details Neutrino Masses and $b-τ$ unification in the Supersymmetric Standard Model Neutrino Masses and $b-τ$ unification in the Supersymmetric Standard Model

1994-05-27

arxiv.org/abs/hep-ph/9405399v1

Phys.Lett. B341 (1994) 173-180

Physics

High Energy Physics

High Energy Physics - Phenomenology

LATeX, 10 pages of text + 4 PostScript figures appended at the end, SISSA 63/94/EP and IC/94/102

Scientific paper

10.1016/0370-2693(94)90307-7

There are several indications that the Majorana masses of the right-handed neutrino components, $M_R,$ are at the intermediate scale: $M_R\sim (10^{10}-10^{12})$ GeV or even lighter. The renormalization effects due to large Yukawa couplings of neutrinos from region of momenta $M_R \ltap q \ltap M_G$ are studied in the supersymmetric standard model. It is shown that neutrino renormalization effect can increase the $m_b/m_\tau$ ratio up to $(10\div 15)\%.$ This strongly disfavours $m_b-m_\tau$ unification for low values of $\tan\beta < 10$ especially at large values of $\alpha_s.$ Lower bounds on $M_R$ and $\tan\beta$ from the $b-\tau$ unification condition were found. The implications of the results to the see-saw mechanism of the neutrino mass generation are discussed.

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