Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-04-21
Int.J.Mod.Phys. A21 (2006) 2617-2634
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages, 6 figures
Scientific paper
10.1142/S0217751X06029491
Leptonic decays of $B$-mesons are theoretically very clean probes for testing the Standard Model (SM) and possible physics beyond it. Amongst the various leptonic decays of the $B$-meson, the pure dileptonic decay $B \to \ell^+ \ell^-$ is very important as this mode is helicity suppressed in the SM but can be substantially enhanced in some of the models beyond the SM, such as supersymmetric (SUSY) theories and the two Higgs doublet model (2HDM). Although the purely dileptonic decay mode is helicity suppressed in the SM its associated mode $B \to \ell^+ \ell^- \gamma$ does not have the same suppression, due to the presence of the $\gamma$ in the final state. In this paper we will also analyse the effects of enhanced $Z$-penguins on these two decay modes.
Choudhury Sudipto R.
Cornell Alan S.
Gaur Naveen
Joshi Girish C.
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