Neutrino masses and b - tau unification in the supersymmetric standard model

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.

supersymmetry
neutrino: mass
mass: neutrino
lower limit
neutrino: right-handed
neutrino: Majorana
bottom: mass
tau: mass
mass: tau
mass ratio

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