Abstract
A search for heavy resonances decaying to a W or Z boson and a Higgs boson in the qq¯(′)bb¯ final state is described. The search uses 36.1 fb−1 of proton–proton collision data at s=13 TeV collected by the ATLAS detector at the CERN Large Hadron Collider in 2015 and 2016. The data are in agreement with the Standard Model expectations, with the largest excess found at a resonance mass of 3.0 TeV with a local (global) significance of 3.3 (2.1) σ. The results are presented in terms of constraints on a simplified model with a heavy vector triplet. Upper limits are set on the production cross-section times branching ratio for resonances decaying to a W (Z) boson and a Higgs boson, itself decaying to bb¯, in the mass range between 1.1 and 3.8 TeV at 95% confidence level; the limits range between 83 and 1.6 fb (77 and 1.1 fb) at 95% confidence level.
Highlights
The discovery of the Higgs boson [1,2] confirms the validity of the Standard Model (SM) in the description of particle interactions at energies up to a few hundred GeV
The data are in agreement with the Standard Model expectations, with the largest excess found at a resonance mass of 3.0 TeV with a local significance of 3.3 (2.1) σ
A search for resonances decaying to a W or Z boson and a Higgs boson has been carried out in the qq( )bbchannel with 36.1 fb−1 of pp collision data √collected by ATLAS during the 2015 and 2016 runs of the LHC at s = 13 TeV
Summary
The discovery of the Higgs boson [1,2] confirms the validity of the Standard Model (SM) in the description of particle interactions at energies up to a few hundred GeV. This Letter presents a search for resonan√ces produced in 36.1 fb−1 of proton–proton (pp) collision data at s = 13 TeV which decay to a W or Z boson and a Higgs boson Such resonances are predicted in multiple models of physics beyond the SM, e.g. composite Higgs [3,4] or Little Higgs [5] models, or models with extra dimensions [6,7]. Searches by the CMS Collaboration at s = 8 TeV in hadronic channels, based on HVT benchmark Model B with gV = 3, exclude heavy resonance masses below 1.6 TeV (W → W H ), below 1.1 TeV and between. The CMS Collaboration carried out a search for a narrow resonance decaying to Z H in the qqτ +τ − final state, setting limits on the Z production crosssection [16].
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