Impact of hidden heavy Higgs channels of VLB-Quarks below 1 TeV in 2HDM

Abstract

We investigate the phenomenological impact of incorporating vector-like bottom (VLB) quarks into the Type-II Two-Higgs-Doublet Model (2HDM-II). This framework introduces novel beyond-Standard-Model (BSM) decay channels $B\to Hb$, $B\to Ab$, and $B\to H^{-}t$, which are typically ignored by LHC pair-production searches focused on Standard Model (SM) final states ($B\to Zb$, $B\to hb$, $B\to Wt$). Our analysis reveals that these BSM pathways significantly weaken current VLB mass constraints. In the 2HDM-II alignment limit, the mass limit for a singlet $B$ shifts from approximately 1.5 TeV down to 1.34 TeV. For $(T,B)$ and $(B,Y)$ doublet configurations, the mass limits relax further to approximately 0.98 TeV, driven by the dominance of $B\to Hb$ and $B\to Ab$ decays, which can reach combined branching ratios of nearly 100\%.

References in corpus (58)

• 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
• Parton distributions for the LHC
• Theory and phenomenology of two-Higgs-doublet models
• The Minimal Composite Higgs Model
• Bulk Fields and Supersymmetry in a Slice of AdS
• HiggsBounds: Confronting Arbitrary Higgs Sectors with Exclusion Bounds from LEP and the Tevatron
• The Minimal Moose for a Little Higgs
• Higgs as a Holographic Pseudo-Goldstone Boson
• HiggsBounds-4: Improved Tests of Extended Higgs Sectors against Exclusion Bounds from LEP, the Tevatron and the LHC
• HiggsBounds 2.0.0: Confronting Neutral and Charged Higgs Sector Predictions with Exclusion Bounds from LEP and the Tevatron
• Light custodians in natural composite Higgs models
• Phenomenology of the Little Higgs Model
• Uncertainties on alpha_S in global PDF analyses and implications for predicted hadronic cross sections
• 2HDMC - Two-Higgs-Doublet Model Calculator
• Lee-Quigg-Thacker Bounds for Higgs Boson Masses in a Two-Doublet Model
• Bulk Standard Model in the Randall-Sundrum Background
• Composite Higgses
• Applying Exclusion Likelihoods from LHC Searches to Extended Higgs Sectors
• Identifying top partners at LHC
• A precision constraint on multi-Higgs-doublet models
• HiggsBounds-5: Testing Higgs Sectors in the LHC 13 TeV Era
• Light Top Partners for a Light Composite Higgs
• HiggsSignals-2: Probing new physics with precision Higgs measurements in the LHC 13 TeV era
• Model Independent Framework for Searches of Top Partners
• Search for heavy Higgs bosons decaying into two tau leptons with the ATLAS detector using $pp$ collisions at $\sqrt{s}=13$ TeV
• Scenarii for interpretations of the LHC diphoton excess: two Higgs doublets and vector-like quarks and leptons
• Metastability bounds on the two Higgs doublet model
• Effects of mixing with quark singlets
• Heavy-quark mass dependence in global PDF analyses and 3- and 4-flavour parton distributions
• HiggsTools: BSM scalar phenomenology with new versions of HiggsBounds and HiggsSignals
• Top Quark Seesaw, Vacuum Structure and Electroweak Precision Constraints
• Introducing the Little Higgs
• New Topflavor Models with Seesaw Mechanism
• LHC Higgs Signatures from Topflavor Seesaw Mechanism
• Unitarity of Little Higgs Models Signals New Physics of UV Completion
• Vector-like quarks in a composite Higgs model
• Search for a heavy Higgs boson decaying into a $Z$ boson and another heavy Higgs boson in the $\ell \ell bb$ and $\ell \ell WW$ final states in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• Signatures of vector-like top partners decaying into new neutral scalar or pseudoscalar bosons
• 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
• Review of searches for vector-like quarks, vector-like leptons, and heavy neutral leptons in proton-proton collisions at $\sqrt{s}$ = 13 TeV at the CMS experiment
• Search for resonances decaying into photon pairs in 139 fb${}^{-1}$ of $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector
• Extending Higgs Inflation with TeV Scale New Physics
• Phenomenology of 2HDM with VLQs
• Hunting for Vectorlike Quarks
• Search for pair-produced vector-like top and bottom partners in events with large missing transverse momentum in pp collisions with the ATLAS detector
• Roadmap to explore vectorlike quarks decaying to a new scalar or pseudoscalar
• Extra Neutral Scalars with Vector-like Fermions at the LHC
• Search for the $HH\to b\bar{b}b\bar{b}$ process via vector-boson fusion production using proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Search for pair-production of vector-like quarks in lepton+jets final states containing at least one $b$-tagged jet using the Run 2 data from the ATLAS experiment
• Probing Charged Higgs Bosons in the 2-Higgs Doublet Model Type-II with Vector-Like Quarks
• Precision prediction of a democratic up-family philic KSVZ axion model at the LHC
• 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
• Search for single production of vectorlike $B$-quarks at the LHC
• Search for charged Higgs bosons through vector-like top quark pair production at the LHC
• Search for single vector-like $B$ quark production in hadronic final states at the LHC