Discovery prospects of a vectorlike top partner decaying to a singlet boson

Abstract

The possibility of a vectorlike top partner decaying to a new colourless weak-singlet scalar or pseudoscalar has attracted some attention in the literature. We investigate the production of a weak-singlet charge-$2/3$ $T$ quark that can decay to a spinless boson ($\Phi$) and a top quark at the LHC. Earlier, in 2203.13753, we have shown that in a large part of the parameter space, the $T\to t\Phi$ and the loop-induced $\Phi \to gg$ decays become the dominant decay modes for these particles. Here, we investigate the discovery prospects of the $T$ quark in this region through the above decays. In particular, we focus on the $pp\to TT\to (t\Phi )(t\Phi )\to (t(gg))(t(gg))$ channel. Separating this signal from the huge Standard Model background is a challenging task, forcing us to employ a multivariate machine-learning technique. We find that the above channel can be a discovery channel of the top partner in the large part of the parameter space where the above decay chain dominates. Our analysis is largely model-independent, and hence our results would be useful in a broad class of new physics models.

12 pages, 10 figures, 3 tables. Published version

References in corpus (12)

• 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
• -- HATHOR -- HAdronic Top and Heavy quarks crOss section calculatoR
• UV Completions of Partial Compositeness: The Case for a SU(4) Gauge Group
• Novel signatures for vector-like quarks
• Search for single production of a vector-like $T$ quark decaying into a Higgs boson and top quark with fully hadronic final states using the ATLAS detector
• 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
• Broad toplike vector quarks at LHC and HL-LHC
• 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
• 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
• 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
• Unsupervised and lightly supervised learning in particle physics
• Exploring vector-like $B$-quark pair production at CLIC in fully hadronic final states
• Multi-top signals of vectorlike quarks at the LHC
• 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
• 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