UCLA

A search for a massive resonance W′$${\mathrm{W}^{\prime }}$$decaying into a W and a Higgs boson in the ℓνbb¯$$\ell u \mathrm{b} \overline{\mathrm{b}} $$ (ℓ=e$$\ell = \mathrm {e}$$, μ$$\mu $$) final state is presented. Results are based on data corresponding to an integrated luminosity of 19.7fb-1$$\,\text {fb}^{{-1}}$$ of proton–proton collisions at s=8$$\sqrt{s}=8$$TeV$$~\text {TeV}$$, collected using the CMS detector at the LHC. For a high-mass (≳$$\gtrsim $$1TeV$$~\text {TeV}$$) resonance, the two bottom quarks coming from the Higgs boson decay are reconstructed as a single jet, which can be tagged by placing requirements on its substructure and flavour. Exclusion limits at 95 % confidence level are set on the production cross section of a narrow resonance decaying into WH, as a function of its mass. In the context of a little Higgs model, a lower limit on the W′$${\mathrm{W}^{\prime }}$$ mass of 1.4TeV$$~\text {TeV}$$ is set. In a heavy vector triplet model that mimics the properties of composite Higgs models, a lower limit on the W′$${\mathrm{W}^{\prime }}$$ mass of 1.5TeV$$~\text {TeV}$$ is set. In the context of this model, the results are combined with related searches to obtain a lower limit on the W′$${\mathrm{W}^{\prime }}$$ mass of 1.8TeV$$~\text {TeV}$$, the most restrictive to date for decays to a pair of standard model bosons.