Mixing of ordinary and exotic quarks

This paper considers the mixing of a new Q = - 1/3 vector-like isosinglet quark, h, with the usual bottom quark (b). Using data on the Kobayashi-Maskawa mixing matrix, ε,ε'/ε, Β and D - bar D mixing the author analyzes the influence of h on a number of rare processes, e.g., K → ν, b → s γ, and D → -. Such exotic fermions can appear in E6 superstring-inspired models