Search for massive WH resonances decaying into the l nu b(b)over-bar final state at root s=8 TeV

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A search for a massive resonance W' decaying into a W and a Higgs boson in the (\ell vb\overline{b} (\ell = e, \mu)) final state is presented. Results are based on data corresponding to an integrated luminosity of 19.7 fb⁻¹ of proton-proton collisions at (\sqrt{s}) = 8TeV, collected using the CMS detector at the LHC. For a high-mass ( (\gtrsim) 1 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' mass of 1.4 TeV is set. In a heavy vector triplet model that mimics the properties of composite Higgs models, a lower limit on the W' mass of 1.5 TeV is set. In the context of this model, the results are combined with related searches to obtain a lower limit on the W' mass of 1.8 TeV, the most restrictive to date for decays to a pair of standard model bosons.

Physics, Particles & Fields, Physics
Khachatryan, V., Sirunyan, A. M., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., Brandstetter, J., Brondolin, E., Dragicevic, M., Erö, J., Flechl, M., Friedl, M., Frühwirth, R., Ghete, V. M., Hartl, C., Hörmann, N., Hrubec, J., Jeitler, M., … Woods, N. (2016). Search for massive WH resonances decaying into the $\ell \nu \mathrm{b} \overline{\mathrm{b}} $ ℓ ν b b ¯ final state at $\sqrt{s}=8$ s = 8 $~\text {TeV}$ TeV. In The European Physical Journal C (Vol. 76, Issue 5). Springer Science and Business Media LLC.