Search for Higgs boson pair production in the bb̅WW^∗ decay mode at √s=13 TeV with the ATLAS detector

A search for Higgs boson pair production in the bb̅WW^∗ decay mode is performed in the bbb̅ℓνqq final state using 36.1 fb⁻¹ of proton-proton collision data at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider. No evidence of events beyond the background expectation is found. Upper limits on the non-resonant pp→HH production cross section of 10 pb and on the resonant production cross section as a function of the HH invariant mass are obtained. Resonant production limits are set for scalar and spin-2 graviton hypotheses in the mass range 500 to 3000 GeV.