Fourth generation effects in rare exclusive B -> K^* l^+ l^- decay

Abstract

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 (Gamma_L/Gamma_T) 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 -> X_s) gamma and semileptonic (B -> X_c l nu) decays, the two possible solutions of the 4x4 Cabibbo-Kobayashi-Maskawa factor (V_{t's} V_{t^'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.

19 pages, 10 postscripted figures, LaTeX formatted

References in corpus (5)

• A Comparative Study of the Decays $B\to (K,K^{\ast }){\ell }^{+}{\ell }^{-}$ in Standard Model and Supersymmetric Theories
• Extra quark-lepton generations and precision measurements
• A Systematic Analysis of the Exclusive B -> K^* l^+ l^- Decay
• The $B\to X_s{l}^{+}{l}^{-}$ and $B\to X_s\gamma$ decays with the fourth generation
• $B\to X_s{\tau }^{+}{\tau }^{-}$ in a CP softly broken two Higgs doublet model

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