Search for Di-Higgs boson production with llbb+ET^miss channel with the ATLAS detector

Observing the production of Higgs boson pairs and measuring the Higgs boson self-coupling is important to both validating the Higgs mechanism in the Standard Model and searching for new physics predicted by BSM models. Many highly motivated models predict the existence of heavy particles decaying into a pair of Higgs bosons. This analysis is to search for Higgs boson pair production from the SM Higgs or BSM Higgs decays with final state of $bbll\nu\nu+E_T^{miss}$ in proton-proton collisions at $\sqrt{s}=13$ TeV. The analysis uses full Run II data collected with the ATLAS detector to an integrated luminosity of 139 fb$^{-1}$. We introduced a deep neural network approach in this analysis to extract signal from background to improve the final significance in the search for non-resonant Higgs boson pair production, while we use a parameterized deep neural network in the search for resonant Higgs boson pair production in the high mass region.