Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-09-28
JHEP 0712:030,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
v2: typos corrected, references updated. 42 pages, 1 figure, LaTeX with JHEP3.cls
Scientific paper
10.1088/1126-6708/2007/12/030
We study the connection between quark and lepton mass matrices in a supersymmetric SO(10) GUT model in six dimensions, compactified on an orbifold. The physical quarks and leptons are mixtures of brane and bulk states. This leads to a characteristic pattern of mass matrices and high-energy CP violating phases. The hierarchy of up and down quark masses determines the CKM matrix and most charged lepton and neutrino masses and mixings. The small hierarchy of neutrino masses is a consequence of the mismatch of the up and down quark mass hierarchies. The effective CP violating phases in the quark sector, neutrino oscillations and leptogenesis are unrelated. In the neutrino sector we can accomodate naturally $\sin \theta_{23} \sim 1$, $\sin \theta_{13} \lesssim 0.1$ and $m_1 \lesssim m_2 \sim \sqrt{\Delta m^2_\text{sol}} < m_3 \sim \sqrt{\Delta m^2_\text{atm}}$.
Buchmüller Wilfried
Covi Laura
Emmanuel-Costa David
Wiesenfeldt Soren
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