Top-Quark Physics

This page gives access to the publicly-available studies and results from the ATLAS top physics working group. Only material available on this page is approved for showing in public by speakers from ATLAS or other collaborations.

For further information and feedback, please contact the group conveners: atlas-phys-top-conveners. (See here for a list of previous top group conveners)

Summary Plots   

Plots summarizing ATLAS top physics results (including those made in the LHCtopWG that also include CMS).

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Selections within a section row are combined with a logical OR, while selections among different section rows are combined with a logical AND.

Global Selections	Show All Deselect All Show Latest 20
CM Energy	14 TeV 13 TeV 8 TeV 7 TeV 5 TeV 2.36 TeV 2.76 GeV 900 GeV 8.16 TeV/NN 5.44 TeV/NN 5.02 TeV/NN 2.76 TeV/NN
Physics theme	B-physics and light states Standard Model Top Higgs BSM Searches Heavy Ion Upgrade Studies SUSY Exotics Tracking Egamma Muon Tau Jet/Etmiss Flavour tagging Physics Modelling
B Physics and Light States	Inclusive production Associated production Prompt production Non-prompt production Muon pairs Hadronic final states CP violation Phi_s measurements Lifetime measurements Fragmentation fraction Helicity amplitudes Polarisation measurements Branching fraction measurements Radiative decays Rare decays Secondary vertices Quarkonium Spectroscopy Exotic states
Heavy Ion	p-p p-Pb Pb-Pb Xe-Xe Centrality ZDC Partonic energy loss Fragmentation functions High pT charged particles Jets Correlations and fluctuations Azimuthal anisotropies Cumulants Event plane correlations Femtoscopy (HBT) Flow decorrelation Flow fluctuations Multi-particle correlations Pseudorapidity correlations Ridge Quarkonium production Heavy-flavour production Electroweak boson production Ultraperipheral collisions Nuclear parton distribution functions Photoproduction Rapidity gaps
SM	Soft QCD processes Diffractive Processes Jets and photons V+jets measurements Drell-Yan production Electroweak processes VBF measurements VBS measurements TGC measurements QGC measurements
Top	Top pair production ttbar cross-section measurements ttbar asymmetry measurements ttbar polarization/helicity measurements ttbar spin correlation measurements ttbar rare decays ttbar + jets measurements ttbar + heavy flavour measurements ttbar + boson measurements Single top measurements Single top t-channel Single top Wt-channel Single top s-channel Single top rare production Single top angular properties Top mass measurements Standard top mass method Other top mass methods Top properties measurements Other top properties Top reconstruction performance Top LHC combination
Higgs	Higgs to WW Higgs to ZZ Higgs to 4 lepton Higgs to 2 photons Higgs to Z+photon Higgs to bb Higgs to cc Higgs to tautau Higgs to 2 muons Higgs to meson+photon Higgs to invisible Gluon fusion production VBF production VH production ttH production bbH production tH production bH production Di-Higgs production Off-shell Higgs H(125) measurements Coupling measurements kappa Simplified template cross-section Pseudo-observables Spin / CP
HDBS	Di-Higgs production BSM Higgs searches Exotic Higgs production Exotic Higgs decays Charged Higgs searches NMSSM BSM resonance Heavy vector triplets
SUSY	Higgsino production Higgs to SUSY Gluino pair production Squark pair production Sbottom pair production Stop pair production Slepton pair production Chargino/neutralino pair production Wimp pair with heavy flavour production RPV SUSY pMSSM GGM/GMSB CMSSM/MSUGRA NUHM Universal extra dimensions Scalar gluon pair production
Exotics	BSM resonance Contact interactions Dark sector Simplified DM model Vector-like quarks Strong gravity Leptoquarks Heavy vector triplets Compositeness Heavy neutrinos Other new particle searches
Physics Modelling	MC development and tuning MC process modelling MC software MC validation
Tracking	Primary vertexing performance Secondary vertexing performance Displaced track reconstruction Conversion reconstruction Hadronic interations Track-based alignment Tracking in dense environments Neural network pixel clustering Heavy Ion tracking
Egamma	Electron reconstruction Electron identification Electron performance Photon reconstruction Photon identification Photon performance Reconstruction of electromagnetic energy Reconstruction of electron tracks Reconstruction of conversion vertices Electromagnetic energy calibration
Muon	Muon reconstruction Muon reconstruction efficiency Muon identification Muon isolation Muon momentum scale Muon momentum resolution Tracking detectors
Tau	Tau reconstruction Hadronically decaying tau Tau decay mode identification Tau identification efficiency Tau energy calibration Tau substructure Boosted ditau reconstruction
Jet/Etmiss	Jet energy calibration Jet substructure Jet mass scale Etmiss performance
Flavour tagging	b-tag performance c-tag performance Flavour tagging calibration Soft muon tag performance D-meson
BSM Searches (SUSY, HDBS, Exotics)	Higgsino production Higgs to SUSY Gluino pair production Squark pair production Sbottom pair production Stop pair production Slepton pair production Chargino/neutralino pair production Wimp pair with heavy flavour production RPV SUSY pMSSM GGM/GMSB CMSSM/MSUGRA NUHM Universal extra dimensions Scalar gluon pair production BSM Higgs searches BSM Higgs production BSM Higgs Decays Charged Higgs searches NMSSM BSM resonance Heavy vector triplets Contact interactions Dark sector Simplified DM model Vector-like quarks Strong gravity Leptoquarks Compositeness Heavy neutrinos Other new particle searches
Upgrade Studies	Heavy Ion upgrade studies BLS upgrade studies SM upgrade studies Top quark upgrade studies Higgs sector upgrade studies SUSY upgrade studies Exotic physics upgrade studies Performance upgrade studies

Click for further selections criteria ...
Signature 'OR' logic within row 'AND' between rows	W Z Photon H WW WZ ZZ Di-photon Vphoton HH VVV Single top Top pair ≥3 tops
	Charged tracks
	0 leptonImplies a lepton (typically electron and muon) veto 1 lepton 2 leptons 2 leptons (same charge) ≥3 leptons
	Taus Photons
	0 jets 1 jet 2 jets ≥3 jets All hadronicDescribes analyses that are agnostic to leptons c-jets b-jets Boosted
	MET
	Long-lived massive particle
Analysis characteristics	Cross-section measurement Mass measurement Statistical combination ISR Gluon fusion VBF VBS PDF fits Double parton scattering BSM search BSM reinterpretation LFV FCNC Particle flow MVA / machine learning EFT interpretation Differential measurement Displaced vertex Lepton-jets Trigger-level analysis High luminosity upgrade studies Likelihood availableDocuments with published fit likelihood
Min luminosity :	fb pb nb μb -1     Filter by minimum integrated luminosity
Date :	Min.   Max.   Filter by date: ArXiv relase Publication

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Papers and publications
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Conference (CONF) notes with preliminary results on data
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Public (PUB) notes with preliminary results on simulated data or interpretations
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List of top Rivet analyses

top Rivet analyses

Event displays @ 13 TeV

Thess and other Run 2 event displays can be found here: EventDisplayRun2Collisions

Display of a ttbar candidate event from proton-proton collisions recorded by ATLAS with LHC stable beams at a collision energy of 13 TeV. The red line shows the path of a muon with transverse momentum around 140 GeV through the detector. The green line shows the path of an electron with transverse momentum around 170 GeV through the detector. The green and yellow bars indicate energy deposits in the liquid argon and scintillating-tile calorimeters, from these deposits 3 jets are identified with transverse momenta between 30 and 80 GeV. Two of the jets are identified as having originated from b-quarks. Tracks reconstructed from hits in the inner tracking detector are shown as arcs curving in the solenoidal magnetic field. A high resolution version is available here.
Display of a ttbar candidate event from proton-proton collisions recorded by ATLAS on 4 June 2015, with LHC stable beams at a collision energy of 13 TeV. The red line shows the path of a muon with transverse momentum around 35 GeV through the detector. The green and yellow bars indicate energy deposits in the liquid argon and scintillating-tile calorimeters, from these deposits 4 jets are identified with transverse momenta between 25 and 80 GeV. Tracks reconstructed from hits in the inner tracking detector are shown as arcs curving in the solenoidal magnetic field. A high resolution version is available here.
Display of event 279124678 in run 267073 recorded by ATLAS in proton-proton collisions with LHC stable beams at a centre-of-mass energy of 13 TeV on June 5th, 2015. The topology of this candidate corresponds to t-channel single top-quark production in the muon plus jets channel. The reconstructed muon represented by the red line has a transverse momentum around 30 GeV through the detector. The green and yellow bars indicate energy deposits in the liquid argon and scintillating-tile calorimeters, from these deposits 2 jets are identified and represented by yellow cones. The central jet, with a transverse momentum around 50 GeV, is identified as having originated from a b-quark. The forward jet, with a transverse momentum around 30 GeV is closer to the beam pipe. The missing transverse momentum represented by the dotted white line has a magnitude around 40 GeV. A high resolution version is available here.
A top event candidate with boosted top quarks.