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

TL;DR

This paper reports a measurement of Wilson coefficient ratios in B meson decays to K* lepton pairs, providing insights into flavor-changing neutral currents and potential new physics.

Contribution

The study presents the first measurement of Wilson coefficient ratios in B to K* l+ l- decays using a large data sample from Belle, advancing understanding of rare B decays.

Findings

Measured ratios of Wilson coefficients A9/A7 and A10/A7.

Used 386 million B Bbar pairs collected at Belle.

Results contribute to testing the Standard Model and probing new physics.

Abstract

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.