Exotic Vector-Like Quark Phenomenology in the Minimal Linear $\sigma$ Model

Abstract

Extensions of the Standard Model that include vector-like quarks commonly also include additional particles that may mediate new production or decay modes. Using as example the minimal linear $\sigma$ model, that reduces to the minimal $SO(5)/SO(4)$ composite Higgs model in a specific limit, we consider the phenomenology of vector-like quarks when a scalar singlet $\sigma$ is present. This new particle may be produced in the decays $T\to t\sigma$, $B\to b\sigma$, where $T$ and $B$ are vector-like quarks of charges $2/3$ and $-1/3$, respectively, with subsequent decay $\sigma \to W^{+}{W}^{-},ZZ,hh$. By scanning over the allowed parameter space we find that these decays may be dominant. In addition, we find that the presence of several new particles allows for single $T$ production cross sections larger than those expected in minimal models. We discuss the observability of these new signatures in existing searches.

19 pages, 10 figures, 4 tables

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Cited by in corpus (14)

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• Heavy vector-like quarks decaying to exotic scalars: a case study with triplets
• Search for pair production of the heavy vectorlike top partner in same-sign dilepton signature at the HL-LHC
• Single production of vectorlike $B$ quarks at the CLIC
• A Simple Model of Dark Matter and CP Violation
• Search for single production of vectorlike $B$-quarks at the LHC
• Pair production of the singlet vector-like B quark at the CLIC
• Single production of vectorlike quarks with charge 5/3 at the 14 TeV LHC
• Exploring vector-like $B$-quark pair production at CLIC in fully hadronic final states
• Probing Effective Field Theory Approach in the CP Violating Minimal Linear $\sigma$ Model
• Tagging fully hadronic exotic decays of the vectorlike $\mathbf{B}$ quark using a graph neural network
• Vector-like quarks decaying into singly and doubly charged bosons at LHC
• Searching for single production of vectorlike quarks decaying into Wb at a future muon-proton collider