Contributions of Vector-Like Quarks to $B\to X_s\gamma$ and $B_s^0{\bar{B}}_s^0$ Mixing

Mayumi Aoki, Makiko Nagashima, Noriyuki Oshimo

The radiative decay $\BSgamma$ and the mixing $\BsBs$ are discussed in the vector-like quark model which contains extra SU(2)-singlet quarks with the same electric charges as the u…