2006/05/18 by S.T. Petcov, Petcov, S. T., Tetsuo Shindou +1 · 1 citation
Physics and Astronomy · #Cosmology and Gravitation Theories #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.hep-ph/0605204
The lepton flavour violating charged lepton decays mu to e + gamma and thermal leptogenesis are analysed in the minimal supersymmetric standard model with see-saw mechanism of neutrino mass generation and soft supersymmetry breaking terms with universal boundary conditions. Hierarchical spectrum of heavy Majorana neutrino masses, M1 << M2 << M3, is considered. In this scenario, the requirement of successful thermal leptogenesis implies a lower bound on M1. For the natural GUT values of the heaviest right-handed Majorana neutrino mass, M3 > 5 times 1013 GeV, and supersymmetry particle masses in the few times 100 GeV range, the predicted mu to e + gamma decay rate exceeds by few order of magnitude the experimental upper limit. This problem is avoided if the matrix of neutrino Yukawa couplings has a specific structure. The latter leads to a correlation between the baryon asymmetry of the Universe predicted by leptogenesis, BR(mu to e + gamma) and the effective Majorana mass in neutrinoless double beta decay.