Abstract
A search for heavy resonances decaying to a Higgs boson and a vector boson is presented. The analysis is performed using data samples collected in 2015 by the CMS experiment at the LHC in proton–proton collisions at a center-of-mass energy of 13 TeV, corresponding to integrated luminosities of 2.2–2.5 fb−1. The search is performed in channels in which the vector boson decays into leptonic final states (Z→νν, W→ℓν, and Z→ℓℓ, with ℓ=e,μ), while the Higgs boson decays to collimated b quark pairs detected as a single massive jet. The discriminating power of a jet mass requirement and a b jet tagging algorithm are exploited to suppress the standard model backgrounds. The event yields observed in data are consistent with the background expectation. In the context of a theoretical model with a heavy vector triplet, a resonance with mass less than 2 TeV is excluded at 95% confidence level. The results are also interpreted in terms of limits on the parameters of the model, improving on the reach of previous searches.
Highlights
The discovery of a Higgs boson H at the CERN LHC [1,2,3] suggests that the standard model (SM) mechanism that connects electroweak (EW) symmetry breaking to the generation of particle masses is largely correct
These limits are verified with the modified frequentist confidence level (CL) method, obtaining results compatible with those obtained with the asymptotic formula
The data samples were collected by the CMS experiment at s = 13 TeV during 2015, and correspond to integrated luminosities of 2.2–2.5 fb−1, depending on the channel
Summary
The discovery of a Higgs boson H at the CERN LHC [1,2,3] suggests that the standard model (SM) mechanism that connects electroweak (EW) symmetry breaking to the generation of particle masses is largely correct. These values, the couplings of the heavy resonances to fermions and to SM bosons are similar, yielding a sizable branching fraction for the heavy resonance decay into a SM vector boson W or Z (generically labeled as V) and a Higgs boson [18]. Bounds from previous searches [19,20,21,22] require the masses of these resonances to be above 1 TeV in the HVT framework. In this mass region, the two bosons produced in the resonance decay would have large Lorentz boosts in the laboratory frame. Results are interpreted in the context of HVT models in the benchmark scenario B [18]
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