University of Minnesota
School of Physics & Astronomy

High Energy Theory Lunchtime Seminar

Thursday, May 8th 2008
12:15 pm:
Speaker: Mu-Chun Chen, UCI
Subject: Tri-bimaximal Neutrino Mixing and Quark CKM Matrix from Finite Group (d)T

The current experimental values for neutrino mixing angles are very close to the predictions of the so-called ``tri-bimaximal'' mixing matrix. I will describe a recent model which gives rise to, for the first time, the tri-bimaximal neutrino mixing and realistic quark CKM matrix simultaneously. The model is based on SU(5) GUT combined with the double tetrahedral group as a family symmetry, and it has only nine parameters to account for all 18 fermion masses and mixing angles. The model also predicts a new sum rule relating the solar mixing angle for the neutrinos and the Cabibbo angle in the quark sector, as a result of the Georgi-Jarlskog relations. The double tetrahedral group may be originated from extra dimensions as a residual symmetry upon orbifold compactification.

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