Cascade decays of Heavy Higgs bosons through vectorlike quarks

Abstract

We study cascade decays of heavy neutral Higgs bosons through vectorlike quarks. We focus on scenarios where decay modes into pairs of vectorlike quarks are not kinematically open which extends the sensitivity of the LHC to larger masses. Assuming only mixing with the third family of standard model quarks the new decay modes of heavy Higgs bosons are: $H\to t_{4}t\to Wbt,Ztt,htt$ and $H\to b_{4}b\to Wtb,Zbb,hbb$, where $t_4$ ($b_4$) is the new up-type (down-type) quark mass eigenstate. In the numerical analysis we assume the CP even Higgs boson in the two Higgs doublet model type-II but the signatures are relevant for many other scenarios. We identify the region of the parameter space where these decay modes are significant or can even dominate, and thus they provide the best opportunities for the simultaneous discovery of a new Higgs boson and vectorlike quarks. We further explore the reach of the High Luminosity LHC for two representative decay modes, $t_4\to Zt\to \ell \ell t$ and $b_4\to Zb\to \ell \ell b$, and found that cross sections at a 0.1 fb level can be probed with simple cut based analyses. We also find that the rates for Higgs cascade decays can be much larger than the rates for a single production of vectorlike quarks. Furthermore, the reach for vectorlike quarks in Higgs cascade decays and pair production extends to comparable masses.

21 pages, 9 figures

References in corpus (28)

• PYTHIA 6.4 Physics and Manual
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• An Introduction to PYTHIA 8.2
• Light custodians in natural composite Higgs models
• Combined measurements of Higgs boson production and decay using up to $80$ fb${}^{-1}$ of proton-proton collision data at $\sqrt{s}=$ 13 TeV collected with the ATLAS experiment
• SusHi: A program for the calculation of Higgs production in gluon fusion and bottom-quark annihilation in the Standard Model and the MSSM
• Search for additional heavy neutral Higgs and gauge bosons in the ditau final state produced in 36 fb${}^{-1}$ of $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• Measurements of Higgs boson properties in the diphoton decay channel with 36 fb${}^{-1}$ of $pp$ collision data at $\sqrt{s}=13$ TeV with the ATLAS detector
• The Higgs boson from an extended symmetry
• Higgs Boson Mass, Sparticle Spectrum and Little Hierarchy Problem in Extended MSSM
• Search for new phenomena in high-mass diphoton final states using 37 fb${}^{-1}$ of proton-proton collisions collected at $\sqrt{s}=13$ TeV with the ATLAS detector
• Search for high-mass diphoton resonances in proton-proton collisions at 13 TeV and combination with 8 TeV search
• Low Scale Flavor Gauge Symmetries
• Limits on Vectorlike Leptons from Searches for Anomalous Production of Multi-Lepton Events
• Gauged Flavor Group with Left-Right Symmetry
• Search for single production of vector-like quarks decaying into $Wb$ in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Search for single production of vector-like quarks decaying to a top quark and a W boson in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Composite Higgs and Dark Matter Model in SU(6)/SO(6)
• Search for single production of vector-like quarks decaying to a b quark and a Higgs boson
• Vacuum alignment in a composite 2HDM
• Unification of Gauge Couplings in the Standard Model with Extra Vector-like Families
• Exotic Higgs decays in the golden channel
• Hunting for Vectorlike Quarks
• Effects of vectorlike leptons on $h\to 4\ell$ and the connection to the muon g-2 anomaly
• New constraints and discovery potential for Higgs to Higgs cascade decays through vectorlike leptons
• Top-bottom-tau Yukawa coupling unification in the MSSM+1VF and fermion masses as IR fixed points
• Mass scale of vectorlike matter and superpartners from IR fixed point predictions of gauge and top Yukawa couplings
• Seven largest couplings of the standard model as IR fixed points

Cited by in corpus (8)

• Muon $g-2$ in two Higgs doublet models with vectorlike leptons
• Signals with six bottom quarks for charged and neutral Higgs bosons
• Tau-jet signatures of vectorlike quark decays to heavy charged and neutral Higgs bosons
• Current status on pair-produced muon-philic vectorlike leptons in multilepton channels at the LHC
• Leptonic cascade decays of a heavy Higgs boson through vectorlike leptons at the LHC
• H Marks the Spot: Searching for Exotic Production of Higgs + X to Map Out New Physics
• 2$b$ or not 2$b$: on the rejection of $g\to b\bar{b}$ jets
• Charged and neutral Higgs bosons in final states with six bottom quarks