b → s(d)γ WITH A VECTOR-LIKE QUARK AS FOURTH GENERATION

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Abstract
We study the implications of a vector-like quark, especially a down-type vector-like quark in b → s(d)γ including the neutral Higgs in the calculation. After analyzing some possible constraints for the mixing, the contribution may be significant for the b → dγ, but not for the b→sγ. We also find that the FCNC among ordinary quarks vanishes for a special form of down-type quark mass matrix.

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