News on $B\to K^{(*)}\nu\bar\nu$ in the Standard Model and beyond

TL;DR

This paper updates Standard Model predictions for rare B decays to K(*) neutrinos, explores new physics models, and analyzes relations with other flavor-changing processes, providing refined theoretical insights.

Contribution

It provides updated SM predictions with reduced uncertainties and a comprehensive analysis of new physics models and their relation to other flavor transitions.

Findings

SM branching ratios are updated with lower uncertainties.

Model-independent and specific NP scenarios are analyzed.

Relations between $b o s u\bar\nu$ and $b\to s\ell^+\, ext{ell}^-$ are detailed.

Abstract

An analysis of the rare B decays $B\to K^{(*)}\nu\bar\nu$ is presented both within the SM and beyond. The SM predictions for the branching ratios are updated and uncertainties reduced. For the NP analysis both a model independent approach is used and concrete NP models are studied. The relations between $b\to s\nu\bar\nu$ and $b\to s\ell^+\ell^-$ transitions are analysed in detail.