Search for $t\bar{t}$ resonances in fully hadronic final states in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

Abstract

This paper presents a search for new heavy particles decaying into a pair of top quarks using 139 fb${}^{-1}$ of proton--proton collision data recorded at a centre-of-mass energy of $\sqrt{s}=13$ TeV with the ATLAS detector at the Large Hadron Collider. The search is performed using events consistent with pair production of high-transverse-momentum top quarks and their subsequent decays into the fully hadronic final states. The analysis is optimized for resonances decaying into a $t\bar{t}$ pair with mass above 1.4 TeV, exploiting a dedicated multivariate technique with jet substructure to identify hadronically decaying top quarks using large-radius jets and evaluating the background expectation from data. No significant deviation from the background prediction is observed. Limits are set on the production cross-section times branching fraction for the new $Z^{\prime }$ boson in a topcolor-assisted-technicolor model. The $Z^{\prime }$ boson masses below 3.9 and 4.7 TeV are excluded at 95% confidence level for the decay widths of 1% and 3%, respectively.

arXiv comment40 pages in total, author list starting page 24, 4 figures, 2 tables, submitted to JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2018-48/

References in corpus (66)

• A Large Mass Hierarchy from a Small Extra Dimension
• The anti-k_t jet clustering algorithm
• A Brief Introduction to PYTHIA 8.1
• Parton distributions for the LHC
• 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
• Theory and phenomenology of two-Higgs-doublet models
• Parton distributions for the LHC Run II
• Parton distributions with LHC data
• The ATLAS Simulation Infrastructure
• 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
• Identifying Boosted Objects with N-subjettiness
• Performance of the ATLAS Trigger System in 2015
• The Catchment Area of Jets
• 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
• Jet Trimming
• Topcolor Assisted Technicolor
• Muon reconstruction performance of the ATLAS detector in proton--proton collision data at $\sqrt{s}$=13 TeV
• 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
• Production and Integration of the ATLAS Insertable B-Layer
• Topological cell clustering in the ATLAS calorimeters and its performance in LHC Run 1
• Performance of pile-up mitigation techniques for jets in $pp$ collisions at $\sqrt{s}=8$ TeV using the ATLAS detector
• Improved luminosity determination in pp collisions at sqrt(s) = 7 TeV using the ATLAS detector at the LHC
• Electron and photon performance measurements with the ATLAS detector using the 2015-2017 LHC proton-proton collision data
• Hadronic top-quark pair production with NNLL threshold resummation
• Jet energy measurement with the ATLAS detector in proton-proton collisions at sqrt(s) = 7 TeV
• Trial factors for the look elsewhere effect in high energy physics
• Energy Correlation Functions for Jet Substructure
• ATLAS $b$-jet identification performance and efficiency measurement with $t\bar{t}$ events in $pp$ collisions at $\sqrt{s}=13$ TeV
• Maximizing Boosted Top Identification by Minimizing N-subjettiness
• Jet energy measurement and its systematic uncertainty in proton-proton collisions at $\sqrt{s}=7$ TeV with the ATLAS detector
• Strategies to Identify Boosted Tops
• Electron efficiency measurements with the ATLAS detector using 2012 LHC proton-proton collision data
• Jet energy resolution in proton-proton collisions at sqrt(s) = 7 TeV recorded in 2010 with the ATLAS detector
• Top Production: Sensitivity to New Physics
• The Bulk RS KK-gluon at the LHC
• Power Counting to Better Jet Observables
• Electron reconstruction and identification in the ATLAS experiment using the 2015 and 2016 LHC proton-proton collision data at $\sqrt{s}$ = 13 TeV
• A search for $t\bar{t}$ resonances using lepton-plus-jets events in proton-proton collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Measurements of $b$-jet tagging efficiency with the ATLAS detector using $t\bar{t}$ events at $\sqrt{s}=13$ TeV
• Search for resonant t t-bar production in proton-proton collisions at sqrt(s) = 8 TeV
• Searches for new physics using the ttbar invariant mass distribution in pp collisions at sqrt(s)=8 TeV
• Performance of top-quark and $W$-boson tagging with ATLAS in Run 2 of the LHC
• Search for anomalous t t-bar production in the highly-boosted all-hadronic final state
• Jets with Variable R
• Search for heavy particles decaying into top-quark pairs using lepton-plus-jets events in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Weak Interactions in Top-Quark Pair Production at Hadron Colliders: An Update
• Open statistical issues in particle physics
• On hypothesis testing, trials factor, hypertests and the BumpHunter
• Search for heavy Higgs bosons $A/H$ decaying to a top quark pair in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• A search for ttbar resonances in lepton+jets events with highly boosted top quarks collected in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• A search for ttbar resonances in the lepton plus jets final state with ATLAS using 4.7 fb^-1 of pp collisions at sqrt(s) = 7 TeV
• Search for resonant $\mathrm{t}\overline{\mathrm{t}}$ production in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Search for Z' resonances decaying to ttbar in dilepton+jets final states in pp collisions at sqrt(s) = 7 TeV
• Search for t t-bar resonances in highly boosted lepton+jets and fully hadronic final states in proton-proton collisions at sqrt(s) = 13 TeV
• Search for resonant t t-bar production in lepton+jets events in pp collisions at sqrt(s) = 7 TeV
• Search for resonances in the mass distribution of jet pairs with one or two jets identified as $b$-jets in proton--proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Cross Sections for Leptophobic Topcolor Z' decaying to top-antitop
• Identification of high transverse momentum top quarks in $pp$ collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector
• Electroweak top-quark pair production at the LHC with $Z^{\prime }$ bosons to NLO QCD in POWHEG

Cited by in corpus (25)

• Exploration at the high-energy frontier: ATLAS Run~2 searches investigating the exotic jungle beyond the Standard Model
• Asymmetric di-Higgs signals of the next-to-minimal 2HDM with a $U(1)$ symmetry
• Exploring new possibilities to discover a light pseudo-scalar at LHCb
• Searching for heavy neutrino in terms of tau lepton at future hadron collider
• pyBumpHunter: A model independent bump hunting tool in Python for High Energy Physics analyses
• Accuracy versus precision in boosted top tagging with the ATLAS detector
• Search for top-philic heavy resonances in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Muon $g-2$ and semileptonic $B$ decays in Bélanger-Delaunay-Westhoff model with gauge kinetic mixing
• Finding flavons at colliders
• Third-generation-philic Hidden Naturalness
• Interplay of Traditional Methods and Machine Learning Algorithms for Tagging Boosted Objects
• Machine-Learning Performance on Higgs-Pair Production Associated with Dark Matter at the LHC
• Hide and Seek with the Third Family Hypercharge Model's $Z^{\prime }$ at the Large Hadron Collider
• Primordial black holes and magnetic fields in conformal neutrino mass models
• Measurement of jet substructure in boosted $t\bar{t}$ events with the ATLAS detector using 140 fb${}^{-1}$ of 13 TeV $pp$ collisions
• Searching for New Physics in Hadronic Final States with Run 2 Proton-Proton Collision Data at the LHC
• Exotic diboson $Z^{\prime }$ decays in the U$\mu \nu$SSM
• A continuous calibration of the ATLAS flavour-tagging classifiers via optimal transportation maps
• One-loop corrections to ALP couplings
• Dark-technicolour at colliders
• Electroweak $t\bar{t}$ hadroproduction in the presence of heavy $Z^{\prime }$ and $W^{\prime }$ bosons at NLO QCD in POWHEG
• Phenomenology of the standard HVM and 95.4 GeV excess
• $U(1{)}^{\prime }$ extensions of the $\mu \nu$SSM
• One-loop corrections to ALP couplings
• Tagging ultra-boosted jets at FCC-hh using machine learning techniques