Measurement of Forward-Backward Asymmetry and Wilson Coefficients in $B \to K^* \ell^+ \ell^-$

Details Measurement of Forward-Backward Asymmetry and Wilson Coefficients in $B \to K^* \ell^+ \ell^-$ Measurement of Forward-Backward Asymmetry and Wilson Coefficients in $B \to K^* \ell^+ \ell^-$

2006-03-09

arxiv.org/abs/hep-ex/0603018v1

Phys.Rev.Lett.96:251801,2006

Physics

High Energy Physics

High Energy Physics - Experiment

submitted to PRL

Scientific paper

10.1103/PhysRevLett.96.251801

We report the first measurement of the forward-backward asymmetry and the ratios of Wilson coefficients $A_9/A_7$ and $A_{10}/A_7$ in $B \to K^* \ell^+ \ell^-$, where $\ell$ represents an electron or a muon. We observe a large integrated forward-backward asymmetry with a significance of 3.4$\sigma$. The results are obtained from a data sample containing 386 $\times 10^6$ $B\bar{B}$ pairs that were collected on the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider.

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