A search for a Standard Model (SM) Higgs boson decaying into the WW final state is performed with an integrated luminosity of up to 19.3~${\rm fb}^{-1}$ of pp collisions at $\sqrt{s}$~=~8~TeV in the high mass regime $600 < m_{\rm H} < 1000$~GeV. The search is performed in the semi-leptonic channel where the hadronically decaying W boson is highly boosted and its decay products are contained in one jet. Jet substructure techniques are used in identifying the hadronically decaying W. The results are also interpreted in a beyond the Standard Model heavy Higgs scenario, based on an effective theory which predicts the existence of two Higgs-like scalar particles, with the mass of the lighter one being around 125 GeV, that completes the unitarization of the WW scattering.

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