Search for decays of the Higgs boson into pair-produced pseudoscalar particles decaying into ${\tau }^{+}{\tau }^{-}{\tau }^{+}{\tau }^{-}$ using $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

A search for a pair of low-mass pseudoscalars $a$ that promptly decay into $\tau$-leptons is presented using 140 fb${}^{-1}$ of proton-proton collision data at $13$ TeV centre-of-mass energy recorded with the ATLAS detector at the Large Hadron Collider. The result is used to place constraints on exotic decays of the Higgs boson into four $\tau$-leptons, $H\to aa\to {\tau }^{+}{\tau }^{-}{\tau }^{+}{\tau }^{-}$. This search focuses on events with either one or two $\tau$-leptons decaying into hadrons and neutrinos, and the remaining three or two $\tau$-leptons decaying into either electron or muon and neutrinos. No significant excess is observed above the expected Standard Model background and upper limits at the 95% confidence level on $\mathcal{B}(H\to aa\to {\tau }^{+}{\tau }^{-}{\tau }^{+}{\tau }^{-})$ are set ranging from 0.06 to 0.23, depending on the mass $m_a$ ranging from 15 to 60 GeV.