Abstract
A search for a massive resonance {mathrm{W}^{prime }}decaying into a W and a Higgs boson in the ell nu mathrm{b} overline{mathrm{b}} (ell = mathrm {e}, mu ) final state is presented. Results are based on data corresponding to an integrated luminosity of 19.7,text {fb}^{{-1}} of proton–proton collisions at sqrt{s}=8 ~text {TeV}, collected using the CMS detector at the LHC. For a high-mass (gtrsim 1~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 {mathrm{W}^{prime }} mass of 1.4~text {TeV} is set. In a heavy vector triplet model that mimics the properties of composite Higgs models, a lower limit on the {mathrm{W}^{prime }} mass of 1.5~text {TeV} is set. In the context of this model, the results are combined with related searches to obtain a lower limit on the {mathrm{W}^{prime }} mass of 1.8~text {TeV}, the most restrictive to date for decays to a pair of standard model bosons.
Highlights
For a W with standard model (SM) couplings to fermions and reduced decay branching ratio to SM bosons, the most stringent limits on production cross sections are reported in searches with leptonic final states [16,17]
This paper presents a search for massive resonances decaying into a W and a standard model (SM) Higgs boson (H) [1,2,3,4] in the νbb ( = e, μ) final state
We evaluate the local significance of the observations in the context of the described test, under the assumptions of a narrow resonance decaying into the WH final state and lepton universality for the W boson decay, by combining the two event categories
Summary
For a W with SM couplings to fermions and reduced decay branching ratio to SM bosons, the most stringent limits on production cross sections are reported in searches with leptonic final states [16,17]. Searches for a W decaying into a pair of SM vector bosons (WZ) [18,19,20,21] provide a lower mass limit of 1.7 TeV. A lower limit on the W mass of 1.5 TeV is set in the same final state reported in Ref. For the resonance mass range considered, the two quarks from the Higgs boson decay would be separated by a small angle, resulting in the detection of a single jet after hadronization. This jet is tagged as coming from. The results of this analysis are combined with two previous results [22,24] to obtain a further improvement in sensitivity
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