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[3:30pm]Department Colloquium: Mu-Chun Chen (UCI)
- Description:
- Speaker: Mu-Chun Chen, UCI
Title: Masses and Mixing Angles of Quarks and Leptons and a Novel Origin of CP Violation
Abstract: The origin of fermion mass hierarchy and mixing still remains one of the great mysteries in particle physics. While the Large Hadron Collider (LHC) may discover the Higgs boson, which can give rise to all fermion masses through the Higgs mechanism, the Higgs mechanism by itself does not explain the observed mass hierarchy and mixing patterns. The observation of non-zero neutrino masses leads to yet another puzzle: why the neutrino masses are so small when compared to other fermions, and why two of the three neutrino mixing angles are so large when compared with their quark counterpart. In this talk, I will present several theoretical ideas based on supersymmetric grand unification, extra dimensions, and new physics at the TeV scale. In particular, I will concentrate on a grand unified model combined with a finite group family symmetry, which naturally predicts realistic masses and mixing angles of all observed fermions, including the neutrinos. Due to the presence of the complex group theoretical Clebsch-Gordon coefficients, CP violation is entirely geometrical in origin, which leads to interesting implications for the generation of the matter antimatter asymmetry in the Universe.
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