A combination of measurements of Higgs boson production and decay using up to $139$ fb$^{-1}$ of proton--proton collision data at $\sqrt{s}=$ 13 TeV collected with the ATLAS experiment

A combination of measurements of Higgs boson production cross sections and branching fractions is presented. The combination is based on the analyses of the Higgs boson decay modes $H \to \gamma\gamma$, $ZZ^\ast$, $WW^\ast$, $\tau\tau$, $b\bar{b}$, $\mu\mu$, and searches for decays into invisible final states. Up to $139$~fb$^{-1}$ of proton--proton collision data collected at $\sqrt{s}= 13$ TeV with the ATLAS detector are used. Combined cross section measurements are presented for the gluon--gluon fusion and vector-boson fusion processes, and for associated production with vector bosons or top-quarks. The global signal strength, defined as the measured Higgs boson signal yield normalized to its SM prediction, is determined to be $\mu = 1.06\pm 0.07$. The combined measurement yields an observed (expected) significance for the associated production with a $W$ boson of $6.3\,\sigma$ ($5.2\,\sigma$). Measurements in kinematic regions defined within the simplified template cross section framework are also shown. The results are interpreted in terms of modifiers applied to the Standard Model couplings of the Higgs boson to other particles, and are used to set exclusion limits on parameters in two-Higgs-doublet models. No significant deviations from Standard Model predictions are observed.