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

We report a measurement of the ratios of Wilson coefficients $A_9/A_7$ and $A_{10}/A_7$ in $B \to K^* \ell^+ \ell^-$. The result is obtained from a data sample containing 386 million $B\bar{B}$ pairs that was collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric energy $e^+ e^-$ collider.