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Search for the Rare DecaysB→Kl+l−andB→K*l+l−

Journal article published in 2002 by B. Aubert, D. Boutigny, J.-M. Gaillard, A. Hicheur, Y. Karyotakis, J. P. Lees, P. Robbe, V. Tisserand, A. Palano, A. Pompili, G. P. Chen, J. C. Chen, N. D. Qi, G. Rong, P. Wang and other authors.
This paper is available in a repository.
This paper is available in a repository.

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Abstract

We present results from a search for the flavor-changing neutral current decays $B\to K\ell^+\ell^-$ and $B\to K^*\ell^+\ell^-$, where $\ell^+\ell^-$ is either an $e^+e^-$ or $μ^+μ^-$ pair. The data sample comprises $22.7\times 10^6$ $ϒ(4S)\to B\bar B$ decays collected with the BABAR detector at the PEP-II $B$ Factory. We obtain the 90% C.L. upper limits ${\mathcal B}(B\to K\ell^+\ell^-)< 0.50\times 10^{-6}$ and ${\mathcal B}(B\to K^*\ell^+\ell^-)<2.9\times 10^{-6}$, close to Standard Model predictions for these branching fractions. We have also obtained limits on the lepton-family-violating decays $B\to Ke^{±}μ^{∓}$ and $B\to K^{*}e^{±}μ^{∓}$.