Speaker: 
Hajime Ishimori
Speaker affiliation: 
TBA
Date: 
Friday, February 7, 2014 - 13:15
Room: 
Building 4 (Law) 4003
Title: 
Residual symmetries for quark and lepton mixing matrices
Abstract: 

We seek possible residual symmetries in lepton and quark sectors
with Abelian Zn symmetry for each sector. For the lepton sector, necessary
conditions for ensuring that the inherent symmetries Z_2xZ_2 for neutrino
and Zm for charged lepton can be embedded into a single discrete group.
For quark sector, we begin with two extreme cases in which both θ13 and θ2
3 or only θ13 are set to zero. Then, cases where all the Cabibbo-Kobayashi-
Maskawa parameters are allowed to take nonzero values are explored. On the o
ther hand, larger groups are necessary in order to be consistent with all th
e mixing parameters. Possibilities of embedding the obtained residual symmet
ries into the ∆(6N2) series are also briefly discussed.