Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-06-15
Eur.Phys.J.C12:507-520,2000
Physics
High Energy Physics
High Energy Physics - Phenomenology
29 pages, latex, 5 figures
Scientific paper
10.1007/s100529900262
In the light of the gathering evidence for $\nu_{\mu}-\nu_{\tau}$ 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 $\tan\beta$ 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 $\tan\beta$ 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.
Carena Marcela
Ellis John
Lola Smaragda
Wagner Carlos E. M.
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