Observation of the Decay $B \to K \ell^{+} \ell^{-}$

Details Observation of the Decay $B \to K \ell^{+} \ell^{-}$ Observation of the Decay $B \to K \ell^{+} \ell^{-}$

2001-09-18

arxiv.org/abs/hep-ex/0109026v2

Phys.Rev.Lett.88:021801,2002

Physics

High Energy Physics

High Energy Physics - Experiment

submitted to Physical Review Letter

Scientific paper

10.1103/PhysRevLett.88.021801

We report a search for the flavor-changing neutral current decay $B \to K^{(*)} \ell^{+} \ell^{-}$ using a 29.1 fb${}^{-1}$ data sample accumulated at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB $e^{+}e^{-}$ storage ring. We observe the decay process $B\to K\ell^+\ell^- (\ell = e, \mu )$, for the first time, with a branching fraction of ${\cal B}(B \to K \ell^{+} \ell^{-}) = (0.75^{+0.25}_{-0.21} \pm 0.09) \times 10^{-6}$.

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