Search for resonant pair production of Higgs bosons in the $b\overline{b}b\overline{b}$ final state using $pp$ collisions at $\sqrt{s}=13\text{}\text{}\mathrm{TeV}$ with the ATLAS detector

A search for resonant Higgs boson pair production in the $b\overline{b}b\overline{b}$ final state is presented. The analysis uses $126\text{}\text{}{\mathrm{fb}}^{-1}–139\text{}\text{}{\mathrm{fb}}^{-1}$ of $pp$ collision data at $\sqrt{s}=13\text{}\text{}\mathrm{TeV}$ collected with the ATLAS detector at the Large Hadron Collider. The analysis is divided into two channels, targeting Higgs boson decays which are reconstructed as pairs of small-radius jets or as individual large-radius jets. Spin-0 and spin-2 benchmark signal models are considered, both of which correspond to resonant $HH$ production via gluon-gluon fusion. The data are consistent with Standard Model predictions. Upper limits are set on the production cross section times branching ratio to Higgs boson pairs of a new resonance in the mass range from $251\text{}\text{}\mathrm{GeV}$ to $5\text{}\text{}\mathrm{TeV}$.