Measurements of electroweak penguins and $B$ decays to final states with missing energy at Belle and Belle II

TL;DR

This paper reports on measurements of rare electroweak penguin $B$ decays involving missing energy using data from the Belle and Belle II experiments, providing insights into $b o s$ transitions.

Contribution

First measurements of electroweak penguin $B$ decays with missing energy at Belle and Belle II, expanding understanding of rare $b o s$ processes.

Findings

Results on $b o s au^+ au^-$ and $b o s uar u$ transitions.

Data consistent with Standard Model predictions.

Enhanced sensitivity to rare decay modes.

Abstract

The Belle and Belle II experiments have collected a 1.3 ab$^{-1}$ sample of $e^+e^-\to B\bar B$ collisions at $\Upsilon(4S)$ centre-of-mass energy. This is ideal environment to search for rare electroweak penguin $B$ decays and notably those involving $B$ decays to final states with missing energy. Results on these datasets of $b\to s \ell^+\ell^-$ $(\ell=e,\mu)$, $b\to s\tau^+\tau^-$, and $b\to s\nu\bar \nu$ transitions are presented.