The Effects of a Vector-like Doublet as the Fourth Generation to $R_b$

Abstract

We study the effects of a vector-like SU(2) doublet quarks as the fourth generation on $R_b$ and $R_c$. By considering the constraint from the experimental data of forward-backward asymmetry, $A_{FB}^b$ and $A_{FB}^c$,as well as FCNC among light quarks, we show that there is an allowed region of parameters for $R_b$ but not for $R_c$.

16pages, Latex, uses epic.sty and eepic.sty

Cited by in corpus (4)

• The $B\to X_s{l}^{+}{l}^{-}$ and $B\to X_s\gamma$ decays with the fourth generation
• Shifting $R_b$ with $A_{FB}^b$
• Test of the chiral structure and FCNC in the quark sector by radiative B meson decays
• Constraints on the masses of fourth generation quarks