Towards New Frontiers with $B\to \pi K$ Decays

Abstract

Exploring correlations between the CP asymmetries of $B_d^0\to {\pi }^0{K}_{\mathrm{S}}$ following from an isospin relation, we uncover new tensions with the Standard Model in data for neutral $B\to \pi K$ decays. Should this intriguing picture originate from New Physics, a modified electroweak penguin sector provides a key scenario. It includes models with extra $Z^{\prime }$ bosons, which offer attractive ways to resolve anomalies in $B\to K^{(\ast )}{\ell }^{+}{\ell }^{-}$ measurements. We present a new strategy to reveal the underlying physics, apply it to current $B\to \pi K$ data, and discuss the excellent prospects for Belle II.

Comments: 7 pages, 3 figures