Contributions of Vector-Like Quarks to $B \to X_s γ$ and $B_s^0 \bar B_s^0$ Mixing

Aoki, Mayumi; Nagashima, Makiko; Oshimo, Noriyuki

Contributions of Vector-Like Quarks to $B \to X_s γ$ and $B_s^0 \bar B_s^0$ Mixing

Authors

Aoki, Mayumi

Nagashima, Makiko

Oshimo, Noriyuki

Description

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 up-type and down-type quarks. Constraints on the extended Cabibbo-Kobayashi-Maskawa matrix are obtained from the experimental results for the branching ratio of $\BSgamma$ . Within these experimental bounds, any value of the branching ratio can be accounted for by the contributions from the vector-like quarks. In sizable ranges of the model parameters, the mixing parameter for $\BsBs$ is much different from the prediction of the standard model.
4 pages, LATEX file with 3 EPS figures. To appear in the proceedings of BCP4, Ise-Shima, Japan, 18-23 Feb 2001