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

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

2000-02-06

arxiv.org/abs/hep-ph/0002061v2

Nucl.Phys. B585 (2000) 275-289

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, 10 postscripted figures, LaTeX formatted

Scientific paper

10.1016/S0550-3213(00)00378-3

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.

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