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This study investigates the influence of the fourth generation quarks on thedouble lepton polarizations in B \rar K \ell^+ \ell^- decay. Taking|V_{t's}V_{t'b}|\sim \{0.01-0.03\} with phase about 100^\circ, which isconsistent with the b\to s\ell^+\ell^- rate and the B_s mixing parameter Deltam_{B_s}$, we obtain that the double lepton(muon and tau) polarizations arequite sensitive to the existence of fourth generation. It can serve as a goodtool to search for new physics effects, precisely, to indirect search for thefourth generation quarks(t', b').

The Effects of Fourth Generation on the double Lepton Polarization in B \rar K \ell^+ \ell^- decay