Measurement of the Differential $q^2$ Spectrum and Forward-Backward Asymmetry for $B \to K^{(*)} \ell^+ \ell^-$

TL;DR

This paper presents measurements of the differential $q^2$ spectrum, forward-backward asymmetry, and branching fractions for $B o K^{(*)} \, \ell^+\ell^-$ decays, providing insights into rare B meson decay dynamics.

Contribution

First measurement of the differential $q^2$ spectrum and forward-backward asymmetry for $B \to K^{(*)} \, \ell^+\ell^-$ decays using Belle data.

Findings

Measured differential $q^2$ spectrum and asymmetry.

Determined branching fractions and ratios.

Provided data for testing the Standard Model.

Abstract

We report measurements of the differential $q^2$ spectrum and the forward-backward asymmetry for $B \to K^{(*)} \ell^+\ell^-$, where $\ell$ represents an electron or a muon, with a data sample of 253 fb$^{-1}$ accumulated on the $\Upsilon(4S)$ resonance with the Belle detector at KEKB. We also present measurements of the branching fractions and their ratios.