Search for a vector-like quark T${}^{\prime }$ $\to$ tH via the diphoton decay mode of the Higgs boson in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Abstract

A search for the electroweak production of a vector-like quark T${}^{\prime }$, decaying to a top quark and a Higgs boson is presented. The search is based on a sample of proton-proton collision events recorded at the LHC at $\sqrt{s}$ = 13 TeV, corresponding to an integrated luminosity of 138 fb${}^{-1}$. This is the first T${}^{\prime }$ search that exploits the Higgs boson decay to a pair of photons. For narrow isospin singlet T${}^{\prime }$ states with masses up to 1.1 TeV, the excellent diphoton invariant mass resolution of 1-2% results in an increased sensitivity compared to previous searches based on the same production mechanism. The electroweak production of a T${}^{\prime }$ quark with mass up to 960 GeV is excluded at 95% confidence level, assuming a coupling strength ${\kappa }_{\mathrm{T}}$ = 0.25 and a relative decay width $\Gamma /M_{{\mathrm{T}}^{\prime }}$ $<$ 5%.

Replaced with the published version. Added the journal reference and DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/B2G-21-007 (CMS Public Pages)

References in corpus (7)

• 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
• Description and performance of track and primary-vertex reconstruction with the CMS tracker
• Automatic spin-entangled decays of heavy resonances in Monte Carlo simulations
• Light custodians in natural composite Higgs models
• Higgs boson production in association with top quarks in the POWHEG BOX
• Handling uncertainties in background shapes: the discrete profiling method

Cited by in corpus (13)

• 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
• Vector-like quarks: status and new directions at the LHC
• Anatomy of Vector-Like Top-Quark Models in the Alignment Limit of the 2-Higgs Doublet Model Type-II
• Search for singly produced vector-like top partners in multilepton final states with 139 ${\mathrm{fb}}^{-1}$ of $pp$ collision data at $\sqrt{s}=13$ TeV with the ATLAS detector
• Anatomy of Vector-Like Bottom-Quark Models in the Alignment Limit of the 2-Higgs Doublet Model Type-II
• Search for charged Higgs bosons through vector-like top quark pair production at the LHC
• Machine-Learning Performance on Higgs-Pair Production Associated with Dark Matter at the LHC
• Collider fingerprints of freeze-in dark matter produced during the fast expansion phase of Universe
• Combination of searches for singly produced vector-like top quarks in pp collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Searching for single production of vectorlike quarks decaying into Wb at a future muon-proton collider
• Tagging ultra-boosted jets at FCC-hh using machine learning techniques
• Search for pair production of heavy resonances in final states with a photon and large-radius jets in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Improving sensitivity of vectorlike top partner searches with jet substructure