Search for single-production of vector-like quarks decaying into $Wb$ in the fully hadronic final state in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

Abstract

A search for $T$ and $Y$ vector-like quarks produced in proton-proton collisions at a centre-of-mass energy of $13\text{TeV}$ and decaying into $Wb$ in the fully hadronic final state is presented. The search uses 139 fb${}^{-1}$ of data collected by the ATLAS detector at the LHC from 2015 to 2018. The final state is characterised by a hadronically decaying $W$ boson with large Lorentz boost and a $b$-tagged jet, which are used to reconstruct the invariant mass of the vector-like quark candidate. The main background is QCD multijet production, which is estimated using a data-driven method. Upon finding no significant excess in data, mass limits at 95% confidence level are obtained as a function of the global coupling parameter, $\kappa$. The observed lower limits on the masses of $Y$ quarks with $\kappa =0.5$ and $\kappa =0.7$ are 2.0 TeV and 2.4 TeV, respectively. For $T$ quarks, the observed mass limits are 1.4 TeV for $\kappa =0.5$ and 1.9 TeV for $\kappa =0.7$.

arXiv comment42 pages in total, author list starting page 25, 7 figures, 2 tables, published in JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2022-43

References in corpus (37)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• The anti-k_t jet clustering algorithm
• An Introduction to PYTHIA 8.2
• A Brief Introduction to PYTHIA 8.1
• FastJet user manual
• Asymptotic formulae for likelihood-based tests of new physics
• A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
• A New Method for Combining NLO QCD with Shower Monte Carlo Algorithms
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• Parton distributions for the LHC Run II
• MadGraph 5 : Going Beyond
• Event generation with SHERPA 1.1
• Parton distributions with LHC data
• The total top quark pair production cross-section at hadron colliders through O(alpha_S^4)
• Top++: a program for the calculation of the top-pair cross-section at hadron colliders
• Successive Combination Jet Algorithm For Hadron Collisions
• Electroweak symmetry breaking from dimensional deconstruction
• The Littlest Higgs
• Event Generation with Sherpa 2.2
• QCD matrix elements + parton showers: The NLO case
• Single-top hadroproduction in association with a W boson
• Percent level precision physics at the Tevatron: first genuine NNLO QCD corrections to q qbar -> t tbar + X
• Top-pair production at hadron colliders with next-to-next-to-leading logarithmic soft-gluon resummation
• NNLO corrections to top-pair production at hadron colliders: the all-fermionic scattering channels
• NNLO corrections to top pair production at hadron colliders: the quark-gluon reaction
• Hadronic top-quark pair production with NNLL threshold resummation
• A handbook of vector-like quarks: mixing and single production
• A First Top Partner Hunter's Guide
• Model Independent Framework for Searches of Top Partners
• Single-top production in MC@NLO
• Phenomenology of Electroweak Symmetry Breaking from Theory Space
• Impact of a Higgs boson at a mass of 126 GeV on the standard model with three and four fermion generations
• Heavy Vector-like Top Partners at the LHC and flavour constraints
• On the Interpretation of Top Partners Searches
• Isolating Wt production at the LHC
• Next-to-leading-order predictions for single vector-like quark production at the LHC
• Novel Interpretation Strategy for Searches of Singly Produced Vector-like Quarks at the LHC

Cited by in corpus (2)

• Search for charged Higgs bosons through vector-like top quark pair production at the LHC
• Searching for single production of vectorlike quarks decaying into Wb at a future muon-proton collider