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Neutrino Masses, Mixing Angles and the Unification of Couplings in the MSSM

M. Carena·J. Ellis·S. Lola·C. E. M. Wagner
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Abstract

In the light of the gathering evidence for $ν_μ-ν_τ$ neutrino oscillations, coming in particular from the Super-Kamiokande data on atmospheric neutrinos, we re-analyze the unification of gauge and Yukawa couplings within the minimal supersymmetric extension of the Standard Model (MSSM). Guided by a range of different grand-unified models, we stress the relevance of large mixing in the lepton sector for the question of bottom-tau Yukawa coupling unification. We also discuss the dependence of the favoured value of $\tanβ$ on the characteristics of the high-energy quark and lepton mass matrices. In particular, we find that, in the presence of large lepton mixing, Yukawa unification can be achieved for intermediate values of $\tanβ$ that were previously disfavoured. The renormalization-group sensitivity to the structures of different mass matrices may enable Yukawa unification to serve as a useful probe of GUT models.

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M. Carena, J. Ellis, S. Lola, C. E. M. Wagner. 1999-06-15. Neutrino Masses, Mixing Angles and the Unification of Couplings in the MSSM. https://doi.org/10.1007/s100529900262

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