Precision flavour physics with $B\to K\nu\bar\nu$ and $B\to Kl^+l^-$

TL;DR

This paper explores how combined measurements of specific B meson decays can test for new physics with minimal theoretical uncertainties, emphasizing the importance of future experimental efforts.

Contribution

It demonstrates that analyzing $B o K uar u$ and $B o Kl^+l^-$ decays together allows for precise new physics tests largely unaffected by form factor uncertainties.

Findings

Residual theoretical errors are at the few percent level.

Combined analysis enhances sensitivity to new physics.

Motivates measurements at future collider experiments.

Abstract

We discuss how the combined analysis of $B\to K\nu\bar\nu$ and $B\to Kl^+l^-$ can provide us with new physics tests practically free of form factor uncertainties. Residual theory errors are at the level of several percent. This study underlines the excellent motivation for measuring these modes at a Super Flavour Factory, or, in the case of $B\to Kl^+l^-$, also at a hadron collider.