0 Fourth generation effects in rare exclusive B → K ∗ l + l − decay

Influence of the fourth generation, if ever exists, on the experimentally measurable quantities such as invariant dilepton mass distribution, lepton forward–backward asymmetry, and the ratio ΓL/ΓT of the decay widths when K ∗ meson is longitudinally and transversally polarized, is studied. Using the experimental results on the branching ratios for the B → Xsγ and semileptonic B → Xclν̄ decays, the two possible solutions of the 4 × 4 Cabibbo–Kobayashi–Maskawa factor Vt′sVt′b are obtained as a function of the t–quark mass. It is observed that the results for the above–mentioned physical quantities are essentially different from the standard model predictions only for one solution of the CKM factor. In this case the above–mentioned physical quantities can serve as efficient tools in search of the fourth generation. The other solution yields almost identical results with the SM. e-mail: [email protected] e-mail: [email protected] e-mail: [email protected]