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We investigate the influence of the fourth generation of quarks on thebranching ratio, the CP-asymmetry and the polarization asymmetries in $B \rar\rho \ell^+ \ell^-$ decay. Taking $|V_{t'd}V_{t'b}|\sim 0.001$ with phase about$10^\circ$, which is consistent with the $sin2\phi_1$ of the CKM and the $B_d$mixing parameter $\Delta m_{B_d}$, we obtain that for both ($\mu, \tau$)channels the branching ratio is increased and the magnitude of CP-asymmetry andpolarization asymmetries decreased by the mass and mixing parameters of the 4thgeneration of quarks . These results can serve as a good tool to search for newphysics effects, precisely, to search for the fourth generation of quarks($t',b')$ via its indirect manifestations in loop diagrams.

Exclusive $B \rar \rho \ell^+ \ell^-$ Decay in the Standard Model with Fourth--Generation