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Charged Lepton Decays L_i to L_j + gamma, Leptogenesis CP-Violating Parameters and Majorana Phases

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dc.contributor.author Petcov, Serguey T. en_US
dc.contributor.author Shindou, Tetsuo en_US
dc.date.accessioned 2006-06-13T07:46:15Z en_US
dc.date.accessioned 2011-09-07T20:27:37Z
dc.date.available 2006-06-13T07:46:15Z en_US
dc.date.available 2011-09-07T20:27:37Z
dc.date.issued 2006-06-13T07:46:15Z en_US
dc.identifier.citation Phys. Rev. D 74 (2006) 073006 en_US
dc.identifier.uri http://preprints.sissa.it/xmlui/handle/1963/1832 en_US
dc.description.abstract We analyse the dependence of the rates of the LFV charged lepton decays mu to e + gamma, tau to e + gamma, tau to mu + gamma (l_i to l_j + gamma) and their ratios, predicted in the class of SUSY theories with see-saw mechanism of nu-mass generation and soft SUSY breaking with universal boundary conditions at the GUT scale, on the Majorana CP-violation phases in the PMNS neutrino mixing matrix and the ``leptogenesis'' CP-violating (CPV) parameters. The case of quasi-degenerate in mass heavy Majorana neutrinos is considered. The analysis is performed for normal hierarchical (NH), inverted hierarchical (IH) and quasi-degenerate (QD) light neutrino mass spectra. We show, in particular, that for NH and IH nu-mass spectrum and negligible lightest neutrino mass, all three l_i to l_j + gamma decay branching ratios, BR(l_i to l_j + gamma), depend on one Majorana phase, one leptogenesis CPV parameter and on the 3-neutrino oscillation parameters; if the CHOOZ mixing angle theta_13 is sufficiently large, they depend on the Dirac CPV phase in the PMNS matrix. The ``double ratios'' R(21/31) sim BR(mu to e + gamma)/BR(tau to e + gamma) and R(21/32) sim BR(mu to e + gamma)/BR(tau to mu + gamma) are determined by these parameters. The same Majorana phase enters into the NH and IH expressions for the effective Majorana mass in neutrinoless double beta decay, <m>. en_US
dc.format.extent 643429 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.relation.ispartofseries SISSA;26/2006/EP en_US
dc.relation.ispartofseries arXiv.org;hep-ph/0605151 en_US
dc.relation.uri 10.1103/PhysRevD.74.073006 en_US
dc.title Charged Lepton Decays L_i to L_j + gamma, Leptogenesis CP-Violating Parameters and Majorana Phases en_US
dc.type Preprint en_US
dc.contributor.department Elementary Particle Theory en_US
dc.contributor.area Physics en_US


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