Search for heavy resonances decaying into two Higgs bosons in the ${\text {b}}\bar{\textrm{b}}\tau ^{+}\tau ^{-}$ final state in proton–proton collisions at $\sqrt{s} = 13\,\text {TeV}$
CMS Collaboration, A. Hayrapetyan, V. Makarenko, A. Tumasyan et autres