# Search for the rare decays $B \to Kl^+l^-$ and $B \to K^*l^+l^-$

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 $\mu^+\mu^-$ pair. The data sample comprises $22.7\times 10^6$ $\Upsilon(4S)\to B\bar B$ 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 $B\to Ke^{\pm}\mu^{\mp}$ and $B\to K^{*}e^{\pm}\mu^{\mp}$.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00011732
Contributor : Claudine Bombar Connect in order to contact the contributor
Submitted on : Tuesday, June 25, 2002 - 3:13:27 PM
Last modification on : Saturday, October 9, 2021 - 3:59:50 AM

### Citation

B. Aubert, D. Boutigny, J.M. Gaillard, A. Hicheur, Y. Karyotakis, et al.. Search for the rare decays $B \to Kl^+l^-$ and $B \to K^*l^+l^-$. Physical Review Letters, American Physical Society, 2002, 88, pp.241801. ⟨in2p3-00011732⟩

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