Abstract
A search for heavy resonances with masses above 1,text {TeV}, decaying to final states containing a vector boson and a Higgs boson, is presented. The search considers hadronic decays of the vector boson, and Higgs boson decays to b quarks. The decay products are highly boosted, and each collimated pair of quarks is reconstructed as a single, massive jet. The analysis is performed using a data sample collected in 2016 by the CMS experiment at the LHC in proton-proton collisions at a center-of-mass energy of 13,text {TeV}, corresponding to an integrated luminosity of 35.9,text {fb}^{-1}. The data are consistent with the background expectation and are used to place limits on the parameters of a theoretical model with a heavy vector triplet. In the benchmark scenario with mass-degenerate mathrm{W^{'}} and mathrm{Z}' bosons decaying predominantly to pairs of standard model bosons, for the first time heavy resonances for masses as high as 3.3,text {TeV} are excluded at 95% confidence level, setting the most stringent constraints to date on such states decaying into a vector boson and a Higgs boson.
Highlights
The discovery of the Higgs boson (H) at the CERN LHC [1,2,3] represents a milestone in the understanding of the standard model (SM) of particle physics
The heavy vector bosons couple to SM bosons and fermions with strengths gVcH and g2cF/gV, respectively, where gV is the strength of the new interaction, cH is the coupling between the heavy vector triplet (HVT) bosons, the Higgs boson, and longitudinally polarized SM vector bosons, cF is the coupling between the HVT bosons and the SM fermions, and g is the SU (2)L gauge coupling
This paper describes the search in proton-proton collisions at 13 TeV for heavy resonances decaying to final states containing a SM vector boson and a Higgs boson, which subsequently decay into a pair of quarks and a pair of b quarks, respectively
Summary
The discovery of the Higgs boson (H) at the CERN LHC [1,2,3] represents a milestone in the understanding of the standard model (SM) of particle physics. The degree of fine-tuning required to accommodate the observed mass of 125 GeV [4,5,6,7] suggests the presence above 1 TeV of new heavy particles beyond the SM (BSM), possibly lying within reach of the LHC These resonances, denoted as X, are expected to be connected to the electroweak sector of the SM, with significant couplings to the SM bosons. The jet mass, substructure, and b tagging information are crucial to identifying hadronically decaying vector bosons and Higgs boson candidates, and to discriminating against the dominant SM backgrounds This search complements and significantly extends the reach of the CMS search with 2015 data for VH resonances with semileptonic decay modes of the vector bosons [24], which excludes at 95% confidence level (CL) W and Z resonances with mass below 1.6 TeV and mass-degenerate V’ resonances with masses up to 2.0 TeV in the HVT benchmark model B. The ATLAS Collaboration has performed a search in the same final state with a comparable data set, excluding W and Z bosons with masses below 2.2 and 1.6 TeV, respectively, and a V’ boson with mass below 2.3 TeV in the HVT model B scenario [25]
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