Roadmap to explore vectorlike quarks decaying to a new scalar or pseudoscalar

Abstract

The current experimental data allow for a sub-TeV colourless weak-singlet scalar or pseudoscalar. If such a singlet field is present together with TeV-range vectorlike top and bottom partners, there is a possibility that the heavy quarks decay dominantly to the singlet state and a third-generation quark, and the singlet state decays to quark and boson pairs. Such a possibility may arise in various models but it has not been explored experimentally, especially in the context of vectorlike-quark searches. We consider some minimal models, covering the possible weak representations of the top and bottom partners, that can be mapped to many well-motivated ultraviolet-complete theories. We chart out the possible interesting and unexplored signatures of the exotic decay of vectorlike quarks and identify benchmark points representing different signal topologies for the high luminosity LHC. We perform a general scan of the parameter space with the relevant direct search bounds and find that large regions, which do not require any fine-tuning, remain open for the unexplored channels. We also perform a simple projection study in the cleanest channel and indicate how other new but experimentally challenging channels can be used to probe more regions of the parameter space.

14 pages, 5 figures, 2 tables; Updated parametrisation, conclusions unchanged

References in corpus (10)

• A custodial symmetry for Zbb
• Search for new phenomena in high-mass diphoton final states using 37 fb${}^{-1}$ of proton-proton collisions collected at $\sqrt{s}=13$ TeV with the ATLAS detector
• UV Completions of Partial Compositeness: The Case for a SU(4) Gauge Group
• $h\to Z\gamma$ in the complex two Higgs doublet model
• Novel signatures for vector-like quarks
• Modelling vector-like quarks in partial compositeness framework
• Scalar versus fermionic top partner interpretations of $t\bar{t}+E_T^{\mathrm{miss}}$ searches at the LHC
• Signals with six bottom quarks for charged and neutral Higgs bosons
• Cancellation in Dark Matter-Nucleon Interactions: the Role of Non-Standard-Model-like Yukawa Couplings
• Vector-like quarks decaying into singly and doubly charged bosons at LHC

Cited by in corpus (15)

• Vector-like Singlet Quarks: a Roadmap
• Vector-like quarks: status and new directions at the LHC
• Machine learning-enhanced search for a vectorlike singlet $B$ quark decaying to a singlet scalar or pseudoscalar
• Exploring maverick top partner decays at the LHC
• Heavy vector-like quarks decaying to exotic scalars: a case study with triplets
• Search for single vector-like $B$ quark production in hadronic final states at the LHC
• Pair production of the singlet vector-like B quark at the CLIC
• Exploring vector-like $B$-quark pair production at CLIC in fully hadronic final states
• Probing Light Scalars and Vector-like Quarks at the High-Luminosity LHC
• Searching for single production of vectorlike quarks decaying into Wb at a future muon-proton collider
• Tagging fully hadronic exotic decays of the vectorlike $\mathbf{B}$ quark using a graph neural network
• Multi-top signals of vectorlike quarks at the LHC
• Impact of hidden heavy Higgs channels of VLB-Quarks below 1 TeV in 2HDM
• Tagging ultra-boosted jets at FCC-hh using machine learning techniques
• Machine learning tagged boosted dark photon: A signature of fermionic portal matter at the LHC