Probing Massive Invisible Dark Photons in Higgs Decays via Gluon--Gluon Fusion at ATLAS Run 3

Waqas Ahmed, Ammara Ahmad, Shabbar Raza

The ATLAS Collaboration has searched for Higgs-boson decays into a photon and missing transverse momentum using $135{\mathrm{fb}}^{-1}$ of Run~3 proton--proton collision data at $\s…