Combination of Higgs boson pair production and single Higgs production at the LHC with the ATLAS detector

A combination of Higgs boson pair production and single Higgs production is performed using up to 139/fb of proton-proton collision data recorded with the ATLAS detector at a center-of-mass energy of √s = 13 TeV at the LHC. The combination includes the bbbb, bb𝜏𝜏 and bbγγ decay channels from the Higgs boson pair production and the ZZ->4l, WW, γγ, tt, bb, VH, bb (boosted), bb (VBF) and bb (ttH) decay channels from the single Higgs boson production. The results are expressed in terms of the constraints on the Higgs boson trilinear self-coupling modifier κλ in two scenarios: 1. with all other coupling modifiers fixed to their SM values and 2. with all other coupling modifiers profiled. In addition, a constraint contour on the (κλ, κt) plane is also presented.