Observation of $B \to K^* \ell^+ \ell^-$

Details Observation of $B \to K^* \ell^+ \ell^-$ Observation of $B \to K^* \ell^+ \ell^-$

2003-08-17

arxiv.org/abs/hep-ex/0308044v4

Phys.Rev.Lett.91:261601,2003

Physics

High Energy Physics

High Energy Physics - Experiment

11 pages, 2 figures, submitted to PRL

Scientific paper

10.1103/PhysRevLett.91.261601

We report the first observation of the flavor-changing neutral current decay $B \to K^* \ell^+ \ell^-$ and an improved measurement of the decay $B \to K \ell^+ \ell^-$, where $\ell$ represents an electron or a muon, with a data sample of 140 fb${}^{-1}$ accumulated at the $\Upsilon(4S)$ resonance with the Belle detector at KEKB. The results for the branching fractions are ${\cal B}(B \to K^* \ell^+ \ell^-)=(11.5^{+2.6}_{-2.4} \pm 0.8 \pm 0.2) \times 10^{-7}$ and ${\cal B}(B \to K \ell^+ \ell^-)=(4.8^{+1.0}_{-0.9} \pm 0.3 \pm 0.1) \times 10^{-7}$, where the first error is statistical, the second is systematic and the third is from model dependence.

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