Speaker
Description
We investigate the influence of the fourth generation of quarks on the CP-asymmetry in $B_s \rightarrow \phi \ell^+\ell^-$ Decay.
This new quarks changes the values of the Wilson coefficients $C_7(\mu)$, $C_9(\mu)$ and $C_{10}(\mu)$ via virtual exchange of the fourth generation up type quark $t^\prime$.
Taking the $|V_{tb} V^*_{ts}| \sim$ $\{0.01-0.03\}$ with phase $\{60,90,120\}$
, which is consistent with the $b \rightarrow s \ell^+\ell^-$ rate and the $B_s$ mixing parameter $\Delta_{m_{B_s}}$, We obtain that for both $(\mu,\tau)$ channels the CP-asymmetries are quite sensitive to the 4th generation quarks mass and mixing parameters. Hence, studying CP-asymmetry for $B_s \rar \phi \ell^+ \ell^-$ decay with new Wilson coefficients can serve as an effective way to identify the new generation quarks $(t^\prime, b^\prime)$ in high energy physics laboratories.
