Heavy vector-like quarks decaying to exotic scalars: a case study with triplets

Abstract

We investigate the pair production of a vector-like quark triplet with hypercharge 5/3 decaying into top quark and a complex scalar triplet with hypercharge 1 at the LHC. This novel scenario, featuring particles with exotic charges - two quarks with charge 8/3 and 5/3 and a scalar with charge 2 - serves as a unique window to models based on the framework of partial compositeness, where these particles naturally emerge as bound states around the TeV scale. Leveraging on the LHC data we establish exclusion limits on the masses of the vector-like quark and the scalar triplet. Subsequently, we design an analysis strategy aimed at improving sensitivity in the region which is still allowed. Our analysis focuses on two specific regions in the parameter space: the first entails a large mass gap between the vector-like quarks and the scalars, so that the vector-like quarks can decay into the scalars; the second involves a small mass gap, such that this decay is forbidden. To simplify the parameter space, both vector-like quarks and scalars are assumed to be degenerate or almost degenerate within the triplets, such that chain decays between fermions and scalars are suppressed. As a result, we found that final states characterized by a same-sign lepton pair, multiple jets, and high net transverse momentum (i.e. effective mass) will play a pivotal role to unveil this model and, more in general, models characterised by multiple vector-like quarks around the same mass scale during the high luminosity LHC phase.

arXiv comment22 pages, 10 figures, 8 tables. Simulation banners are attached as ancillary files, v2: references updated, matches JHEP version

References in corpus (83)

• 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
• DELPHES 3, A modular framework for fast simulation of a generic collider experiment
• FeynRules 2.0 - A complete toolbox for tree-level phenomenology
• Generating Feynman Diagrams and Amplitudes with FeynArts 3
• LHAPDF6: parton density access in the LHC precision era
• Parton distributions from high-precision collider data
• The Minimal Composite Higgs Model
• UFO - The Universal FeynRules Output
• Top++: a program for the calculation of the top-pair cross-section at hadron colliders
• MadAnalysis 5, a user-friendly framework for collider phenomenology
• The Minimal Moose for a Little Higgs
• Matching matrix elements and shower evolution for top-quark production in hadronic collisions
• Higgs as a Holographic Pseudo-Goldstone Boson
• Light custodians in natural composite Higgs models
• The Path to Proton Structure at One-Percent Accuracy
• A handbook of vector-like quarks: mixing and single production
• The Composite Nambu-Goldstone Higgs
• Identifying top partners at LHC
• Fermionic UV completions of Composite Higgs models
• Light Top Partners for a Light Composite Higgs
• A First Top Partner Hunter's Guide
• Automatic evaluation of UV and R2 terms for beyond the Standard Model Lagrangians: a proof-of-principle
• Designing and recasting LHC analyses with MadAnalysis 5
• General Composite Higgs Models
• On the effect of resonances in composite Higgs phenomenology
• Model Independent Framework for Searches of Top Partners
• Towards a public analysis database for LHC new physics searches using MadAnalysis 5
• Vector-like leptons: Higgs decays and collider phenomenology
• Fermions on an Interval: Quark and Lepton Masses without a Higgs
• Observable contributions of new exotic quarks to quark mixing
• On the Tuning and the Mass of the Composite Higgs
• The Discrete Composite Higgs Model
• The Composite Higgs and Light Resonance Connection
• Gauge theories of Partial Compositeness: Scenarios for Run-II of the LHC
• UV Completions of Partial Compositeness: The Case for a SU(4) Gauge Group
• Vectorlike leptons at the Large Hadron Collider
• A Fermionic Top Partner: Naturalness and the LHC
• Light Custodians and Higgs Physics in Composite Models
• On the Interpretation of Top Partners Searches
• Minimal Composite Higgs Models at the LHC
• A Strong Sector at the LHC: Top Partners in Same-Sign Dileptons
• Pair production of heavy Q=2/3 singlets at LHC
• Direct and indirect signals of natural composite Higgs models
• Common exotic decays of top partners
• Electroweak Precision Constraints on Vector-like Fermions
• Gauge/gravity dynamics for composite Higgs models and the top mass
• Gauge/gravity dual dynamics for the strongly coupled sector of composite Higgs models
• Early discovery of top partners and test of the Higgs nature
• Signatures of vector-like top partners decaying into new neutral scalar or pseudoscalar bosons
• Exotic decays of top partners: mind the search gap
• Higgs Couplings in Composite Models
• A naturally light Higgs without light Top Partners
• Top quark induced effective potential in a composite Higgs model
• Vacuum misalignment and pattern of scalar masses in the SU(5)/SO(5) composite Higgs model
• New sensitivity of current LHC measurements to vector-like quarks
• Heavy Vector-like quark with charge 5/3 at the LHC
• Composite Charge 8/3 Resonances at the LHC
• Exotic Vector-Like Quark Phenomenology in the Minimal Linear $\sigma$ Model
• Modelling vector-like quarks in partial compositeness framework
• Searches for vector-like quarks at future colliders and implications for composite Higgs models with dark matter
• Implications of a High-Mass Diphoton Resonance for Heavy Quark Searches
• Roadmap to explore vectorlike quarks decaying to a new scalar or pseudoscalar
• Exotic decays of top partners with charge 5/3: bounds and opportunities
• Phenomenology of unusual top partners in composite Higgs models
• Hunting for top partner with a new signature at the LHC
• Signals with six bottom quarks for charged and neutral Higgs bosons
• Constraining Composite Higgs Models using LHC data
• Vector-like quarks coupling discrimination at the LHC and future hadron colliders
• Discovery prospects of a vectorlike top partner decaying to a singlet boson
• The linear-non-linear frontier for the Goldstone Higgs
• Six Top Messages of New Physics at the LHC
• Single and double production of the Higgs boson at hadron and lepton colliders in minimal composite Higgs models
• A model of spontaneous $CP$ breaking at low scale
• Broad toplike vector quarks at LHC and HL-LHC
• Exploring maverick top partner decays at the LHC
• Composite dark matter phenomenology in the presence of lighter degrees of freedom
• Vacuum stability in the Standard Model with vector-like fermions
• Modification of Higgs Couplings in Minimal Composite Models
• Collider signatures of vector-like fermions from a flavor symmetric model
• Production of exotic composite quarks at the LHC
• Impact of a colored vector resonance on the collider constraints for top-like top partner
• Exploring extended Higgs sectors via pair production at the LHC

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• Combination of searches for singly produced vector-like top quarks in pp collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Exploring vector-like $B$-quark pair production at CLIC in fully hadronic final states
• Tagging fully hadronic exotic decays of the vectorlike $\mathbf{B}$ quark using a graph neural network
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