First Observation of the Radiative Decay $D^0 \to \gamma\omega$
Abstract
We report the first observation of the radiative charm decay $D^0 \to \gamma \omega$ with a significance of $6.0\sigma$. The analysis uses 20.3\,$\rm{fb}^{-1}$ of $e^+e^-$ collision data collected by the BESIII detector at a center-of-mass energy of 3.773\,GeV, and employs a deep learning strategy based on the Particle Transformer architecture. The absolute branching fraction of $\mathcal{B}(D^0\to\gamma\omega)=(2.12\pm 0.40_{\rm stat}\pm 0.25_{\rm syst})\times 10^{-5}$ confirms the dominance of long-distance hadronic dynamics in radiative charm decays and provides a valuable benchmark for testing non-perturbative QCD calculations of $D \to \gamma V$ transitions.