Abstract
A search for the production of a narrow-width resonance decaying into a pair of Higgs bosons decaying into the bbZZ channel is presented. The analysis is based on data collected with the CMS detector during 2016, in proton-proton collisions at the LHC, corresponding to an integrated luminosity of 35.9 fb−1. The final states considered are the ones where one of the Z bosons decays into a pair of muons or electrons, and the other Z boson decays to either a pair of quarks or a pair of neutrinos. Upper limits at 95% confidence level are placed on the production of narrow-width spin-0 or spin-2 particles decaying to a pair of Higgs bosons, in models with and without an extended Higgs sector. For a resonance mass range between 260 and 1000 GeV, limits on the production cross section times branching fraction of a spin-0 and spin-2 resonance range from 0.1 to 5.0 pb and 0.1 to 3.6 pb, respectively. These results set limits in parameter space in bulk Randall-Sundrum radion, Kaluza-Klein excitation of the graviton, and next-to-minimal two-Higgs doublet models (N2HDMs). For specific choices of parameters the N2HDM can be excluded in a mass range between 360 and 620 GeV for a resonance decaying to two Higgs bosons. This is the first search for Higgs boson resonant pair production in the bbZZ channel.Received 11 June 2020Accepted 15 July 2020DOI:https://doi.org/10.1103/PhysRevD.102.032003Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.© 2020 CERN, for the CMS CollaborationPhysics Subject Headings (PhySH)Research AreasParticle decaysPhysical SystemsBottom quarkHiggs bosonsTechniquesHadron collidersParticles & Fields
Highlights
The discovery of the Higgs boson (h) in 2012 [1,2,3,4] has led to a detailed program of studies of the Higgs field couplings to the elementary particles of the standard model (SM) of particle physics: leptons, quarks, and gauge bosons
While coverage of as many hh decay channels as possible remains necessary to understand the exact nature of the Higgs boson self-coupling and the electroweak symmetry breaking mechanism, a bbZZ search is interesting in models with extended electroweak sectors, where the phenomenology of additional Higgs bosons can lead to significantly enhanced bbZZ production, while suppressing the beyond the standard model (BSM) production of bbbb, bbττ, or bbγγ final states
Due to the small branching fraction of hh → bbZZ and the high multiplicities of the final states, the analyses presented in this paper are less sensitive to these models compared to the previous searches
Summary
The discovery of the Higgs boson (h) in 2012 [1,2,3,4] has led to a detailed program of studies of the Higgs field couplings to the elementary particles of the standard model (SM) of particle physics: leptons, quarks, and gauge bosons. Having multiple decay channels with complementary background compositions and sensitivities over a large resonance mass (mX) range makes this combination of the bbllνν and bblljj channels highly efficient for covering the bbZZ final state This is the first search for Higgs boson resonant pair production in the bbZZ channel. While coverage of as many hh decay channels as possible remains necessary to understand the exact nature of the Higgs boson self-coupling and the electroweak symmetry breaking mechanism, a bbZZ search is interesting in models with extended electroweak sectors, where the phenomenology of additional Higgs bosons can lead to significantly enhanced bbZZ production, while suppressing the BSM production of bbbb, bbττ, or bbγγ final states
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