A likelihood-based reconstruction algorithm for top-quark pairs and the KLFitter framework

Abstract

A likelihood-based reconstruction algorithm for arbitrary event topologies is introduced and, as an example, applied to the single-lepton decay mode of top-quark pair production. The algorithm comes with several options which further improve its performance, in particular the reconstruction efficiency, i.e., the fraction of events for which the observed jets and leptons can be correctly associated with the final-state particles of the corresponding event topology. The performance is compared to that of well-established reconstruction algorithms using a common framework for kinematic fitting. This framework has a modular structure which describes the physics processes and detector models independently. The implemented algorithms are generic and can easily be ported from one experiment to another.

20 pages, 5 figures, 2 tables

References in corpus (9)

• Event generation with SHERPA 1.1
• Implications of CTEQ global analysis for collider observables
• A parton shower algorithm based on Catani-Seymour dipole factorisation
• Expected Performance of the ATLAS Experiment - Detector, Trigger and Physics
• Top-tagging: A Method for Identifying Boosted Hadronic Tops
• Strategies to Identify Boosted Tops
• Measurement of the charge asymmetry in top quark pair production in pp collisions at sqrt(s) = 7 TeV using the ATLAS detector
• Measurement of the top-quark mass in t t-bar events with lepton+jets final states in pp collisions at sqrt(s) = 7 TeV
• Measurement of the top quark mass with the template method in the top antitop -> lepton + jets channel using ATLAS data

Cited by in corpus (54)

• Search for the Standard Model Higgs boson produced in association with top quarks and decaying into $b\bar{b}$ in pp collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector
• Measurement of the top quark mass in the $t\bar{t}\to$ lepton+jets channel from $\sqrt{s}=8$ TeV ATLAS data and combination with previous results
• Measurements of normalized differential cross-sections for ttbar production in pp collisions at sqrt(s) = 7 TeV using the ATLAS detector
• Measurement of the $c$-jet mistagging efficiency in $t\bar{t}$ events using $pp$ collision data at $\sqrt{s}=13$ TeV collected with the ATLAS detector
• Measurements of top-quark pair differential and double-differential cross-sections in the $\ell$+jets channel with $pp$ collisions at $\sqrt{s}=13$ TeV using the ATLAS detector
• Evidence for single top-quark production in the $s$-channel in proton-proton collisions at $\sqrt{s}=$8 TeV with the ATLAS detector using the Matrix Element Method
• Measurement of the top quark mass in the $t\bar{t}\to \mathrm{lepton}+\mathrm{jets}$ and $t\bar{t}\to \mathrm{dilepton}$ channels using $\sqrt{s}=7$ TeV ATLAS data
• Measurements of spin correlation in top-antitop quark events from proton-proton collisions at $\sqrt{s}=7$ TeV using the ATLAS detector
• Search for Higgs boson decays into a pair of light bosons in the $bb\mu \mu$ final state in $pp$ collision at $\sqrt{s}=$13 TeV with the ATLAS detector
• SPANet: Generalized Permutationless Set Assignment for Particle Physics using Symmetry Preserving Attention
• Measurement of the charge asymmetry in top-quark pair production in the lepton-plus-jets final state in $pp$ collision data at $\sqrt{s}=8$ TeV with the ATLAS detector
• Measurement of the $W$ boson polarisation in $t\bar{t}$ events from $pp$ collisions at $\sqrt{s}$ = 8 TeV in the lepton+jets channel with ATLAS
• Learning to Simulate High Energy Particle Collisions from Unlabeled Data
• Permutationless Many-Jet Event Reconstruction with Symmetry Preserving Attention Networks
• Search for Higgs boson decays into a pair of pseudoscalar particles in the $bb\mu \mu$ final state with the ATLAS detector in $pp$ collisions at $\sqrt{s}=13$ TeV
• Probing the CP structure of the top quark Yukawa coupling: Loop sensitivity vs. on-shell sensitivity
• Measurement of the top-quark mass in the fully hadronic decay channel from ATLAS data at $\sqrt{s}=7$ TeV
• ν-Flows: Conditional Neutrino Regression
• Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at $\sqrt{s}=$ 8 TeV
• CP tests of Higgs couplings in $t\bar{t}h$ semileptonic events at the LHC
• Heavy baryons as polarimeters at colliders
• Direct top-quark decay width measurement in the $t\bar{t}$ lepton+jets channel at $\sqrt{s}$=8 TeV with the ATLAS experiment
• Measurement of the top quark forward-backward production asymmetry and the anomalous chromoelectric and chromomagnetic moments in pp collisions at $\sqrt{s}=$ 13 TeV
• Topological Reconstruction of Particle Physics Processes using Graph Neural Networks
• A Holistic Approach to Predicting Top Quark Kinematic Properties with the Covariant Particle Transformer
• From the Bottom to the Top -- Reconstruction of $t\bar{t}$ Events with Deep Learning
• Measurements of charge and CP asymmetries in $b$-hadron decays using top-quark events collected by the ATLAS detector in $pp$ collisions at $\sqrt{s}=8$ TeV
• Search for non-resonant Higgs boson pair production in the $2b+2\ell +E_{\mathrm{T}}^{\mathrm{miss}}$ final state in $pp$ collisions $\sqrt{s}=13\mathrm{TeV}$ with the ATLAS detector
• Reconstruction of Unstable Heavy Particles Using Deep Symmetry-Preserving Attention Networks
• Measurement of the charge asymmetry in top-quark pair production in association with a photon with the ATLAS experiment
• Resolving Combinatorial Ambiguities in Dilepton $t\bar{t}$ Event Topologies with Neural Networks
• Climbing to the Top of the ATLAS 13 TeV data
• Zero-Permutation Jet-Parton Assignment using a Self-Attention Network
• Boosted top tagging and its interpretation using Shapley values
• Evidence for the charge asymmetry in $pp\to t\bar{t}$ production at $\sqrt{s}=13$ TeV with the ATLAS detector
• Top-Quark Physics at the LHC
• On the ATLAS Top Mass Measurements and the Potential for Stealth Stop Contamination
• Parton Labeling without Matching: Unveiling Emergent Labelling Capabilities in Regression Models
• Top-quark mass measurements: review and perspectives
• Reconstruction of top quark pair dilepton decays in electron-positron collisions
• Measuring CP-Violating Observables in Rare Top Decays at the LHC
• Top-philic Machine Learning
• PAIReD jet: A multi-pronged resonance tagging strategy across all Lorentz boosts
• Quantum-annealing-inspired algorithms for multijet clustering
• Measurement of single top-quark production in the s-channel in proton$-$proton collisions at $\sqrt{\mathrm{s}}=13$ TeV with the ATLAS detector
• Measuring properties of a Heavy Higgs boson in the $H\to t\bar{t}\to b{W}^{+}\bar{b}{W}^{-}$ decay
• Tagging ultra-boosted jets at FCC-hh using machine learning techniques
• TIGER: A Topology-Agnostic, Hierarchical Graph Network for Event Reconstruction
• Single- and and double-differential cross-sections in $t\bar{t}$ final states in the $\ell$+jets channe
• Bidirectional Long Short-Term Memory (BLSTM) neural networks for reconstruction of top-quark pair decay kinematics
• Measurement of the $t\bar{t}Z$ Production Cross Section in the Final State with Three Charged Leptons using 36.1 fb${}^{-1}$ of $pp$ Collisions at 13 TeV at the ATLAS Detector
• Photon radiation effects in kinematic reconstruction of top quarks
• Top quark pair production cross section at LHC in ATLAS
• Charge asymmetry measurements in $t\bar{t}$ events at the LHC