Special Seminar by Prof. Yi Liao, School of Physics, Nankai University, China on August 19 at 2:00 pm

Abstract (arXiv:1008.0117):

A mechanism has been suggested recently to generate the neutrino mass out of a dimension-seven operator. This is expected to relieve the tension between the occurrence of tiny neutrino mass and the observability of other physics effects beyond it. Such a mechanism would inevitably entail lepton flavor violating effects. We study in this work the radiative and purely leptonic transitions of the light charged leptons. In so doing we make a systematic analysis of the flavor structure by providing a convenient parametrization of the mass matrices in terms of independent physical parameters and diagonalizing them explicitly. We illustrate our numerical results by sampling over two CP phases and one Yukawa coupling which are the essential parameters in addition to the heavy lepton mass. We find that with the stringent constraints coming from the muon decays taken into account the decays of the tau lepton are severely suppressed in the majority of parameter space. There exist however small regions in which some tau decays can reach a level that is about one order of magnitude below their current bounds.

Time: 2:00 pm, Thu 08/19/2010
Room: Seminar room 5

J. Tang