Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-10-31
Nucl.Phys. B739 (2006) 208-233
Physics
High Energy Physics
High Energy Physics - Phenomenology
25 pages, 9 figures; typos corrected, few clarifying comments and one figure added; version submitted for publication
Scientific paper
10.1016/j.nuclphysb.2006.01.034
The LFV charged lepton decays mu to e + gamma, tau to e + gamma and tau to mu + gamma and thermal leptogenesis are analysed in the MSSM with see-saw mechanism of neutrino mass generation and soft SUSY breaking with universal boundary conditions. The case of hierarchical heavy Majorana neutrino mass spectrum, M_1 << M_2 << M_3, is investigated. Leptogenesis requires M_1 > 10^9 GeV. Considering the natural range of values of the heaviest right-handed Majorana neutrino mass, M_3 > 5*10^{13} GeV, and assuming that the soft SUSY breaking universal gaugino and/or scalar masses have values in the range of few 100 GeV, we derive the combined constraints, which the existing stringent upper limit on the mu to e + gamma decay rate and the requirement of successful thermal leptogenesis impose on the neutrino Yukawa couplings, heavy Majorana neutrino masses and SUSY parameters. Results for the three possible types of light neutrino mass spectrum -- normal and inverted hierarchical and quasi-degenerate -- are obtained.
Petcov Serguey T.
Rodejohann Werner
Shindou Tetsuo
Takanishi Yasutaka
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