"Hadron-in-fat-jet'' AI Tagging to Detect Rare Decays Such as $W^{\pm}\toπ^{\pm}γ$

We investigate a novel class of boosted-object signatures at the LHC, where a high-$p_{\text{T}}$ fat-jet contains an identifiable hadron or quarkonium state originating from rare or semi-exclusive decays. Unlike conventional boosted jet studies, which focus on multi-prong partonic substructure, our