Tau and dark sector searches at Belle and Belle II

Abstract

The Belle and Belle II experiments provide a powerful platform for beyond-the-Standard-Model searches, particularly in tau and dark sectors. This summary reports include a measurement of CP violation in $τ^- \to π^- K_S^0 ν_τ$, a search for $τ^- \to \ell^- η$, a search for axion-like particles via $e^+ e^- \to γa (\to γγ)$ using Belle II data, and a search for feebly interacting particles in $B \to h X_{\rm inv}$ decays using Belle data.