Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-11-17
Phys.Lett. B437 (1998) 351-358
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, 4 figures
Scientific paper
10.1016/S0370-2693(98)00929-0
The atmospheric neutrino anomaly reported by the super-Kamiokande collaboration suggests existence of a large flavour violating Yukawa coupling in the lepton sector. We discuss lepton-flavour violation at low energies in the framework of the supersymmetric SU(5)_{GUT} model with right-handed neutrinos. We find that for a wide range of parameter space suggested from the atmospheric neutrino anomaly, if the tau-neutrino Yukawa coupling is as large as that of top quark, lower bounds of the branching ratios of mu -> e gamma, tau -> mu gamma, and the mu-e conversion rate on $^{48}_{22}Ti$ become around 10^{-14}, 10^{-9}, and 10^{-16}, respectively. These reaction rates may be in the region accessible by near future experiments.
Hisano Junji
Nomura Daisuke
Yanagida Takayuki
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