Charm rescattering in $B^0\to K^0\bar{\ell}\ell$: an improved analysis

TL;DR

This paper refines the analysis of charm rescattering effects in the decay $B^0 o K^0ar{ ell}$ by incorporating dipole interactions and detailed form factor structures, enhancing the understanding of these contributions.

Contribution

It introduces an improved model including dipole interactions and refined form factors to better estimate charm rescattering effects in $B^0$ decays.

Findings

Enhanced estimates of charm rescattering contributions.

Inclusion of dipole interactions with intermediate charm-meson states.

Detailed analysis of electromagnetic form factors.

Abstract

We improve upon previous explicit estimates of charm rescattering contributions to the decay $B^0\to K^0\bar{\ell}\ell$ by including contributions from dipole interactions with the intermediate charm-meson states, and by further investigating the structure of the electromagnetic form factors. Using a model of fundamental meson fields inspired by heavy-hadron chiral perturbation theory, augmented by form factors motivated by theoretical considerations as well as experimental data, we provide a thorough investigation of rescattering contributions induced by intermediate $D^{(*)}D^{(*)}_s$ states.