Heavy Higgs Coupled to Vector-like Quarks: Strong CP Problem and Search Prospects at the 14 TeV LHC

Abstract

Motivated by a solution to the strong CP problem we propose a model where a new heavy neutral CP-even Higgs boson couples to vector-like quarks enhancing its production cross section whose dominant decays are into weak bosons. The masses of the vector-like quarks are generated through interactions with a singlet scalar field charged under a broken global $U(1)$ symmetry providing a solution to the strong CP problem by means of the Peccei-Quinn mechanism. The diboson excess observed by the ATLAS Collaboration is discussed as the new heavy Higgs boson is a candidate to explain a possible signal in this channel. We also show that the 14 TeV LHC is capable of discovering this heavy Higgs with masses up to 1 TeV in the $H\to ZZ\to {\ell }^{+}{\ell }^{-}{\ell }^{\prime +}{\ell }^{\prime -}$ search channel using boosted decision trees to better discriminate between signals and backgrounds and to tame systematic uncertainties in the background rates.

21 pages, 8 figures, just a correction in Table I

References in corpus (19)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• 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
• Precise determination of the mass of the Higgs boson and tests of compatibility of its couplings with the standard model predictions using proton collisions at 7 and 8 TeV
• Boosted Decision Trees as an Alternative to Artificial Neural Networks for Particle Identification
• Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector
• Search for Scalar Diphoton Resonances in the Mass Range $65-600$ GeV with the ATLAS Detector in $pp$ Collision Data at $\sqrt{s}$ = 8 $TeV$
• Evaluation of three methods for calculating statistical significance when incorporating a systematic uncertainty into a test of the background-only hypothesis for a Poisson process
• Search for massive resonances in dijet systems containing jets tagged as W or Z boson decays in pp collisions at sqrt(s) = 8 TeV
• Search for massive resonances decaying into pairs of boosted bosons in semi-leptonic final states at sqrt(s) = 8 TeV
• The Quest for an Intermediate-Scale Accidental Axion and Further ALPs
• Observation of Single Top Quark Production and Measurement of |Vtb| with CDF
• Constraints on and future prospects for Two-Higgs-Doublet Models in light of the LHC Higgs signal
• Framework for Model Independent Analyses of Multiple Extra Quark Scenarios
• The ATLAS Di-boson Excess Could Be an R-parity Violating Di-smuon Excess
• Measuring the signal strength in ttH with H->bb
• Diboson anomaly: heavy Higgs resonance and QCD vector-like exotics
• Combination of Run-1 Exotic Searches in Diboson Final States at the LHC

Cited by in corpus (1)

• NMSSM extended with vectorlike particles and the diphoton excess at the LHC