Abstract
A statistical combination of searches is presented for massive resonances decaying to WW, WZ, ZZ, WH, and ZH boson pairs in proton–proton collision data collected by the CMS experiment at the LHC. The data were taken at centre-of-mass energies of 8 and 13 TeV, corresponding to respective integrated luminosities of 19.7 and up to 2.7 fb−1. The results are interpreted in the context of heavy vector triplet and singlet models that mimic properties of composite-Higgs models predicting W′ and Z′ bosons decaying to WZ, WW, WH, and ZH bosons. A model with a bulk graviton that decays into WW and ZZ is also considered. This is the first combined search for WW, WZ, WH, and ZH resonances and yields lower limits on masses at 95% confidence level for W′ and Z′ singlets at 2.3 TeV, and for a triplet at 2.4 TeV. The limits on the production cross section of a narrow bulk graviton resonance with the curvature scale of the warped extra dimension k˜=0.5, in the mass range of 0.6 to 4.0 TeV, are the most stringent published to date.
Highlights
Hypotheses for physics beyond the standard model (SM) predict the existence of heavy resonances that decay to any combination of two among the massive vector bosons (W or Z, collectively referred to as V) or to a V and the scalar SM Higgs boson (H)
We present for each channel 95% confidence level (CL) exclusion limits on the signal strength μ in Eq (1), expressed as the exclusion limit on the ratio σ95%/σtheory of the signal cross section to the predicted cross section, assuming that all branching fractions are as predicted by the relevant signal models
A statistical combination of searches for massive narrow resonances decaying to WW, ZZ, WZ, WH, and ZH boson pairs in the mass range 0.6–4.0 TeV has been presented
Summary
Hypotheses for physics beyond the standard model (SM) predict the existence of heavy resonances that decay to any combination of two among the massive vector bosons (W or Z, collectively referred to as V) or to a V and the scalar SM Higgs boson (H). Among the considered models are those dealing with warped extra dimensions (WED) [1,2] and composite-Higgs bosons [3,4,5,6]. Searches for such VV and VH resonances in different final states have previously been performed by the ATLAS [7,8,9,10,11,12] and CMS [13,14,15,16,17,18,19,20] experiments at the CERN LHC. The HVT model generalizes a large number of models that predict spin-1 resonances, such as those in composite-Higgs theories, which can arise as a singlet, either W or Z [26,27,28], or as a V triplet (where V represents W and Z bosons) [22]
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