The Higgs boson production cross-sections in proton-proton collisions are measured in the $H\rightarrow WW^{\ast}\rightarrow e\nu\mu\nu$ decay channel. The proton-proton collision data were produced at the Large Hadron Collider at a centre-of-mass energy of 13 TeV and recorded by the ATLAS detector in 2015 and 2016, corresponding to an integrated luminosity of 36.1 fb$^{-1}$. The gluon fusion and vector boson fusion cross-sections time the $H\rightarrow WW^{\ast}$ branching ratio are measured to be 12.6 ^{+1.3}_{-1.2} (\mathrm{stat.}) ^{+1.9}_{-1.8}(\mathrm{sys.})~\mathrm{pb} and 0.50 ^{+0.24}_{-0.23} (\mathrm{stat.}) \pm 0.18(\mathrm{sys.})~\mathrm{pb}, respectively, in agreement with the Standard Model predictions.

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