Reconstruction and identification of boosted di-$\tau$ systems in a search for Higgs boson pairs using 13 TeV proton$-$proton collision data in ATLAS
2020.
The collaboration

Abstract (data abstract)
CERN-LHC. A search for resonant Higgs boson pair production is performed in the $b\bar{b}\tau^{+}\tau^{-}$ final state with boosted objects using $L=139$ fb$^{-1}$, $\sqrt{s}=13$ TeV proton-proton collision data with the ATLAS detector. 95% CL upper limits are set on the production cross section of a heavy, narrow, scalar resonance decaying into a pair of Higgs bosons.