Phenomenology of 2HDM with VLQs

Abstract

In this paper, we examine the consistency of the Large Hadron Collider (LHC) data collected during Run 1 and 2 by the ATLAS and CMS experiments with the predictions of a 2-Higgs Doublet Model (2HDM) embedding Vector-Like Quarks (VLQs) for $pp\to H,A$ production and $H,A\to \gamma \gamma$ decay mechanisms, respectively, of (nearly) degenerate CP-even ($H$) and CP-odd ($A$) Higgs bosons. We show that a scenario containing one single VLQ with Electro-Magnetic (EM) charge $2/3$ can explain the above ATLAS and CMS data for masses in the region 350 GeV $\le m_{\mathrm{VLQ}}\le 1.5$ TeV or so, depending on $\tan \beta$, and for several values of the mixing angle between the top quark ($t$) and its VLQ counterpart ($T$).We then perform a global fit onto the model by including all relevant experimental as well as theoretical constraints. The surviving samples of our analysis are discussed within 2$\sigma$ of the LHC measurements. Additionally, we also comment on the recent anomalous result reported by CMS using Run 2 data on the associated Standard Model (SM) Higgs boson production with top quark pairs $pp\to t\bar{t}h$ with an observed significance of 3.3$\sigma$. Other than these specific examples, we also present a phenomenological analysis of the main features of the model, including the most promising $T$ decay channels.

28 pages, 10 figures, some sections added and others rewritten to make the presentation clearer, figures changed and references added

References in corpus (12)

• 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
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• Measurements of the Higgs boson production and decay rates and constraints on its couplings from a combined ATLAS and CMS analysis of the LHC $pp$ collision data at $\sqrt{s}=$ 7 and 8 TeV
• Updated NNLO QCD predictions for the weak radiative B-meson decays
• Weak Radiative Decays of the B Meson and Bounds on $M_{H^{\pm }}$ in the Two-Higgs-Doublet Model
• Survey of vector-like fermion extensions of the Standard Model and their phenomenological implications
• News from FormCalc and LoopTools
• Framework for Model Independent Analyses of Multiple Extra Quark Scenarios
• Vector-like quarks coupling discrimination at the LHC and future hadron colliders
• Variations on a Higgs theme
• The 750 GeV threshold to a new particle world

Cited by in corpus (18)

• Novel signatures for vector-like quarks
• Vector-like Singlet Quarks: a Roadmap
• Interpreting the $W$-mass anomaly in the vectorlike quark models
• Interpreting the 750 GeV digamma excess: a review
• Disentangling new physics effects on non-resonant Higgs boson pair production from gluon fusion
• Vector-like quarks: status and new directions at the LHC
• A natural mechanism for approximate Higgs alignment in the 2HDM
• Probing Charged Higgs Bosons in the 2-Higgs Doublet Model Type-II with Vector-Like Quarks
• High-scale validity of a two Higgs doublet scenario: predicting collider signals
• The oblique parameters in the 2HDM with Vector-Like Quarks: Confronting $M_W$ CDF-II Anomaly
• Anatomy of Vector-Like Top-Quark Models in the Alignment Limit of the 2-Higgs Doublet Model Type-II
• Anatomy of Vector-Like Bottom-Quark Models in the Alignment Limit of the 2-Higgs Doublet Model Type-II
• Non-standard signatures of vector-like quarks in a leptophobic 221 model
• Pseudoscalar decays to gauge bosons at the LHC and at a future 100 TeV collider
• The Two Scales of New Physics in Loop-Induced Higgs Couplings
• Impact of hidden heavy Higgs channels of VLB-Quarks below 1 TeV in 2HDM
• Tagging fully hadronic exotic decays of the vectorlike $\mathbf{B}$ quark using a graph neural network
• Real and Complex Singlet-Scalar Benchmarks with a Vector-Like Down Quark for $B\to X_s\gamma$ and $B_s-{\bar{B}}_s$ Mixing