Looking for New Physics Through the Exclusive $b\to s\nu\bar{\nu}$ Modes

TL;DR

This paper reviews the Standard Model predictions for rare B meson decays involving neutrinos, analyzes recent Belle-II measurements that exceed these predictions, and explores potential new physics explanations using effective field theory and specific models.

Contribution

It provides a critical reassessment of SM predictions for $B o K^{(*)} uar{ u}$ decays and discusses implications of recent experimental results for new physics models.

Findings

Belle-II measurement exceeds SM prediction by nearly 3σ

Reevaluation of theoretical predictions for $B o K^{(*)} uar{ u}$ decays

Discussion of new physics interpretations using EFT and specific models

Abstract

The Belle-II experiment has recently measured $\mathcal{B}(B^+\to K^+\nu\bar{\nu})$, which appears to be almost $3\sigma$ larger than its Standard Model (SM) prediction. In this talk, I will critically revisit the status of the SM predictions for the $B\to K^{(\ast)}\nu\bar{\nu}$ decays, and discuss the interpretation of the recent Belle-II measurement in terms of a general Effective Field Theory, as well as concrete models of physics beyond the SM.