Diboson excess in the Higgs singlet and vector-like quark models

Abstract

Diboson resonance with mass of $1.8-2$ TeV is reported successively by CMS and ATLAS experiments in proton-proton collisions at $\sqrt{s}=8$ TeV. We investigate the potentiality of Higgs singlet as the TeV resonance. The challenges of low production cross section and high width for a fundamental scalar could be got over by three factors: (1) larger Yukawa couplings, (2) larger number of heavy quarks and (3) smaller mixing angle with standard model Higgs. We find that the required factors could be realized in the framework of two vector-like triplet quarks (VLTQs) and the resulting production cross section and decay fraction of heavy Higgs $\sigma (pp\to H)\times \mathrm{BR}(H\to W^{+}{W}^{-}+ZZ)$ can be of $\mathcal{O}(10)$ fb when masses of new heavy quarks are 1 TeV, the values of Yukawa couplings are around $3$ and the mixing angle is $\sin \theta \sim 0.11$. Furthermore, we study the product of VLTQ-pair production cross section and the BRs of VLTQ decays, and find that the cross sections in the decay channels, such as $u_{4,5}\to b{W}^{+}$, $d_5\to t{W}^{-}$ and $d_4\to bh(Z)$ could be $7-17$ fb at 13 TeV LHC.

16 pages, 7 figures, gluon fusion production cross section and diphoton decay process of SM Higgs are addressed, reference added

References in corpus (7)

• Implications of CTEQ global analysis for collider observables
• 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
• Observable Effects of General New Scalar Particles
• Higgs Boson Production via Gluon Fusion: Squark Loops at NLO QCD
• Search for new resonances decaying via WZ to leptons in proton-proton collisions at sqrt(s) = 8 TeV
• Augmenting the diboson excess for Run 2

Cited by in corpus (9)

• The 750 GeV $S$-cion: Where else should we look for it?
• Higgs singlet boson as a diphoton resonance in a vector-like quark model
• Multiboson production in W' decays
• Bounds on LFV Higgs decays in a vector-like lepton model and searching for doubly charged leptons at the LHC
• Single production of $X_{\pm 5/3}$ and $Y_{\mp 4/3}$ vectorlike quarks at the LHC
• Angular observables for spin discrimination in boosted diboson final states
• Diboson resonances within a custodially protected warped extra-dimensional scenario
• Heavy Higgs Coupled to Vector-like Quarks: Strong CP Problem and Search Prospects at the 14 TeV LHC
• Comparing mesons and W_L W_L TeV-resonances