Nagoya University
Theoretical Elementary Particle Physics Laboratory

Date&Time Tue Nov 26 2019 (17:00 - 18:00)
Yutaka Hosotani
Affiliation Osaka University
Title CKM matrix and FCNC suppression in SO(5)×U(1)×SU(3) gauge-Higgs unification
Abstract The Cabibbo-Kobayashi-Maskawa (CKM) mixing matrix and flavor-changing neutral currents (FCNC's) in the quark sector are examined in the GUT inspired SO(5) × U(1) × SU(3) gauge-Higgs unification in which the 4D Higgs boson is identified with the Aharonov-Bohm phase in the fifth dimension. Gauge invariant brane interactions play an important role for the flavor mixing in the charged-current weak interactions. The CKM matrix is reproduced except that the up quark mass needs to be larger than the observed one. FCNC's are naturally suppressed as a consequence of the gauge invariance, with a factor of order $10^{−6}$.
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