Search for Higgs boson decays into a pair of pseudoscalar particles in the $\gamma \gamma {\tau }_{\text{had}}{\tau }_{\text{had}}$ final state using $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

ATLAS Collaboration

A search for exotic decays of the 125 GeV Higgs boson into a pair of new spin-0 particles, $H\to aa$, where one decays into a photon pair and the other into a $\tau$-lepton pair, is…