Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-08-01
Int.J.Mod.Phys.A12:5609-5624,1997
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages, figures included, revised version for publication (accepted in Int. Jour. Mod. Phys. A)
Scientific paper
10.1142/S0217751X97002942
We study the effects of a vector-like SU(2) quark doublet as a fourth generation. In this model we examine the chiral structure and the FCNC in the quark sector by using radiative B meson decays in the allowed region for parameters from $R_b = {\Gamma_{qq}}/{\Gamma_{had.}}$. We compute the ratio $R = {Br (b \to d \gamma)}/{Br (b \to s \gamma)}$ in the model which realizes a different chiral structure as well as FCNC. The constraints has been extracted from the experimental results of B meson decays, the $T_{new}$ parameter of oblique corrections and $R_b$. Under the natural assumption that the violation of the $V-A$ structure in the light-quark sector is small, we can determine the allowed region for most of the mixings parameters and the vector-like quark masses. We show that there will be significant deviations in $R$ from the SM prediction due to the FCNC's and the violation of the $V-A$ structure.
Handoko Laksana Tri
Yoshikawa Tadashi
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