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A search for a pair of neutral, scalar bosons with each decaying into two $W$bosons is presented using 36.1 fb$^{-1}$ of proton-proton collision data at acentre-of-mass energy of 13 TeV recorded with the ATLAS detector at the LargeHadron Collider. This search uses three production models: non-resonant andresonant Higgs boson pair production and resonant production of a pair of heavyscalar particles. Three final states, classified by the number of leptons, areanalysed: two same-sign leptons, three leptons, and four leptons. Nosignificant excess over the expected Standard Model backgrounds is observed. Anobserved (expected) 95% confidence-level upper limit of 160 (120) times theStandard Model prediction of non-resonant Higgs pair production cross-sectionis set from a combined analysis of the three final states. Upper limits are seton the production cross-section times branching ratio of a heavy scalar $X$decaying into a Higgs boson pair in the mass range of 260 GeV $\le m_X \le$ 500GeV and the observed (expected) limits range from 9.3 (10) pb to 2.8 (2.6) pb.Upper limits are set on the production cross-section times branching ratio of aheavy scalar $X$ decaying into a pair of heavy scalars $S$ for mass ranges of280 GeV $\le m_X \le$ 340 GeV and 135 GeV $\le m_S \le$ 165 GeV and theobserved (expected) limits range from 2.5 (2.5) pb to 0.16 (0.17) pb.

Search for Higgs boson pair production in the $WW^{(*)}WW^{(*)}$ decay channel using ATLAS data recorded at $\sqrt{s}=13$ TeV

Search for Higgs boson pair production in the $WW^{()}WW^{()}$ decay channel using ATLAS data recorded at $\sqrt{s}=13$ TeV