Search for invisible particles produced in association with single top quarks in proton-proton collisions at $\sqrt{s}$=13 TeV with the ATLAS detector

Abstract

A search for events with one top quark and missing transverse momentum in the final state is presented. The fully hadronic decay of the top quark is explored by selecting events with a reconstructed boosted top-quark topology produced in association with large missing transverse momentum. The analysis uses 139 fb${}^{-1}$ of proton-proton collision data at a centre-of-mass energy of $\sqrt{s}$=13 TeV recorded during 2015-2018 by the ATLAS detector at the Large Hadron Collider. The results are interpreted in the context of simplified models for Dark Matter particle production and the single production of a vector-like $T$ quark. In the absence of a significant excess with respect to the Standard Model expectations, 95% confidence-level upper limits on the corresponding cross-sections are obtained. The production of Dark Matter particles in association with a single top quark is excluded for masses of a scalar (vector) mediator up to 4.3 (2.3) TeV, assuming $m_{\chi }$=1 GeV and the model couplings ${\lambda }_q$=0.6 and ${\lambda }_{\chi }$=0.4 ($a$=0.5 and $g_{\chi }$=1). The production of a single vector-like $T$ quark is excluded for masses below 1.8 TeV assuming a coupling to the top quark ${\kappa }_T$=0.5 and a branching ratio for $T\to Zt$ of 25%.

arXiv comment55 pages in total, author list starting page 38, 13 figures, 3 tables, published in JHEP 05 (2024) 263. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2022-40

References in corpus (53)

• XGBoost: A Scalable Tree Boosting System
• 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
• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Parameter Results
• Particle Dark Matter: Evidence, Candidates and Constraints
• 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
• FeynRules 2.0 - A complete toolbox for tree-level phenomenology
• Parton distributions for the LHC Run II
• MadGraph 5 : Going Beyond
• Event generation with SHERPA 1.1
• Parton distributions with LHC data
• Confidence Level Computation for Combining Searches with Small Statistics
• PDF4LHC recommendations for LHC Run II
• Dark Matter Candidates from Particle Physics and Methods of Detection
• The Minimal Composite Higgs Model
• Scattering Amplitudes with Open Loops
• Top++: a program for the calculation of the top-pair cross-section at hadron colliders
• QCD Matrix Elements + Parton Showers
• The Littlest Higgs
• Comix, a new matrix element generator
• QCD matrix elements + parton showers: The NLO case
• High-precision QCD at hadron colliders: electroweak gauge boson rapidity distributions at NNLO
• Two-loop soft anomalous dimensions for single top quark associated production with a W- or H-
• QCD matrix elements and truncated showers
• Single-top hadroproduction in association with a W boson
• Jet Trimming
• Little Higgs Review
• A critical appraisal of NLO+PS matching methods
• Next-to-next-to-leading-order collinear and soft gluon corrections for t-channel single top quark production
• NNLL resummation for s-channel single top quark production
• Dark Matter Benchmark Models for Early LHC Run-2 Searches: Report of the ATLAS/CMS Dark Matter Forum
• A handbook of vector-like quarks: mixing and single production
• HATHOR for single top-quark production: Updated predictions and uncertainty estimates for single top-quark production in hadronic collisions
• Identifying top partners at LHC
• Model Independent Framework for Searches of Top Partners
• Single-Top-Quark Production via W-Gluon Fusion at Next-to-Leading Order
• Observable contributions of new exotic quarks to quark mixing
• Single-top-quark production at hadron colliders
• Effective description of quark mixing
• Model-Independent Searches for New Quarks at the LHC
• On the Interpretation of Top Partners Searches
• Heavy Quarks Above the Top at the Tevatron
• Monotops at the LHC
• Next-to-leading-order predictions for single vector-like quark production at the LHC
• Dark matter production in association with a single top-quark at the LHC in a two-Higgs-doublet model with a pseudoscalar mediator
• Novel Interpretation Strategy for Searches of Singly Produced Vector-like Quarks at the LHC
• Two is not always better than one: Single Top Quarks and Dark Matter
• Search for the signal of monotop production at the early LHC

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• Combination of searches for singly produced vector-like top quarks in pp collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Improving sensitivity of vectorlike top partner searches with jet substructure
• Tagging ultra-boosted jets at FCC-hh using machine learning techniques