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

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.

Comments: Contribution to the 2024 Electroweak session of the 58th Rencontres de Moriond. Based on arXiv:2301.06990 and arXiv:2309.02246