Performance of $b$-Jet Identification in the ATLAS Experiment

Abstract

The identification of jets containing $b$ hadrons is important for the physics programme of the ATLAS experiment at the Large Hadron Collider. Several algorithms to identify jets containing $b$ hadrons are described, ranging from those based on the reconstruction of an inclusive secondary vertex or the presence of tracks with large impact parameters to combined tagging algorithms making use of multi-variate discriminants. An independent $b$-tagging algorithm based on the reconstruction of muons inside jets as well as the $b$-tagging algorithm used in the online trigger are also presented.The $b$-jet tagging efficiency, the $c$-jet tagging efficiency and the mistag rate for light flavour jets in data have been measured with a number of complementary methods. The calibration results are presented as scale factors defined as the ratio of the efficiency (or mistag rate) in data to that in simulation. In the case of $b$ jets, where more than one calibration method exists, the results from the various analyses have been combined taking into account the statistical correlation as well as the correlation of the sources of systematic uncertainty.

111 pages plus author list + cover page (128 pages total), 55 figures, 17 tables, submitted to JINST, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/PERF-2012-04/

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• 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
• Module production of the one-arm AFP 3D pixel tracker
• Measurement of the jet mass in high transverse momentum $Z(\to b\overline{b})\gamma$ production at $\sqrt{s}=13$ TeV using the ATLAS detector
• Measurement of $W^{+}{W}^{-}$ production in association with one jet in proton--proton collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Vector Bosons and Jets in Proton Collisions
• LHC Signals for Singlet Neutrinos from a Natural Warped Seesaw (II)
• Measurements of jet observables sensitive to $b$-quark fragmentation in $t\bar{t}$ events at the LHC with the ATLAS detector
• Search for new phenomena in final states with two leptons and one or no $b$-tagged jets at $\sqrt{s}=13$ TeV using the ATLAS detector
• Constraints on simplified dark matter models involving an $s$-channel mediator with the ATLAS detector in $pp$ collisions at $\sqrt{s}=13$ TeV
• Enhancing the hunt for new phenomena in dijet final-states using anomaly detection filters at the High-Luminosity Large Hadron Collider
• Flavoured jet algorithms: a comparative study
• Measurement of jet activity in top quark events using the $e\mu$ final state with two $b$-tagged jets in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Class Imbalance Techniques for High Energy Physics
• LHC signals for Singlet Neutrinos from a Natural Warped Seesaw (I)
• Electroweak, QCD and flavour physics studies with ATLAS data from Run 2 of the LHC
• Search for excited electrons singly produced in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS experiment at the LHC
• Investigating the Quantum Properties of Jets and the Search for a Supersymmetric Top Quark Partner with the ATLAS Detector
• Non-standard Higgs couplings in single Higgs boson production at the LHC and future linear collider
• Boosting the charged Higgs search prospects using jet substructure at the LHC
• Measurements of the charge asymmetry in top-quark pair production in the dilepton final state at $\sqrt{s}=8$ TeV with the ATLAS detector
• Search for heavy resonances decaying into a photon and a hadronically decaying Higgs boson in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Machine learning using rapidity-mass matrices for event classification problems in HEP
• Search for flavour-changing neutral current interactions of the top quark and the Higgs boson in events with a pair of $\tau$-leptons in pp collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Prospects for measuring quark polarization and spin correlations in $b\bar{b}$ and $c\bar{c}$ samples at the LHC
• Machine learning classification: case of Higgs boson CP state in H to tau tau decay at LHC
• Measurements of observables sensitive to colour reconnection in $t\bar{t}$ events with the ATLAS detector at $\sqrt{s}=13$ TeV
• Measurement of $K_S^0$ and ${\Lambda }^0$ production in $t\bar{t}$ dileptonic events in $pp$ collisions at $\sqrt{s}=$ 7 TeV with the ATLAS detector
• Comparison between simulated and observed LHC beam backgrounds in the ATLAS experiment at $E_{\text{beam}}$ = 4 TeV
• Search for a new heavy scalar particle decaying into a Higgs boson and a new scalar singlet in final states with one or two light leptons and a pair of $\tau$-leptons with the ATLAS detector
• Deeply Learned Preselection of Higgs Dijet Decays at Future Lepton Colliders
• Unraveling the couplings of a Drell-Yan produced $Z^{\prime }$ with heavy-flavor tagging
• Identifying Heavy-Flavor Jets Using Vectors of Locally Aggregated Descriptors
• Les Houches guide to reusable ML models in LHC analyses
• Measurement of the $t\bar{t}$ production cross section in the $\tau$ + jets final state in $pp$ collisions at $\sqrt{s}=8$ TeV using the ATLAS detector
• Probing Magnetic Moment Operators in $H\gamma$ Production and $H\to {\tau }^{+}{\tau }^{-}\gamma$ Rare Decay
• Integrated and differential fiducial cross-section measurements for the vector boson fusion production of the Higgs boson in the $H\to W{W}^{\ast }\to e\nu \mu \nu$ decay channel at 13 $\text{TeV}$ with the ATLAS detector
• Probing the two Higgs doublet wedge region with charged Higgs boson decays to boosted jets
• Strange Jet Tagging
• Jet Substructure Probe on Scalar Leptoquark Models via Top Polarization
• Explainable AI for ML jet taggers using expert variables and layerwise relevance propagation
• Jet fragmentation as a tool to explore double parton scattering using Z-boson + jets processes at the LHC
• Transforming jet flavour tagging at ATLAS
• Classifier Surrogates: Sharing AI-based Searches with the World
• Measurement of the inclusive $t\bar{t}$ production cross section in the lepton+jets channel in $pp$ collisions at $\sqrt{s}$= 7 TeV with the ATLAS detector using support vector machines
• Calibration of a soft secondary vertex tagger using proton-proton collisions at $\sqrt{s}=$13 TeV with the ATLAS detector
• Probing light-quark Yukawa couplings via hadronic event shapes at lepton colliders
• Configuration, Performance, and Commissioning of the ATLAS $b$-jet Triggers for the 2022 and 2023 LHC data-taking periods
• B-jet Tagging Using a Hybrid Edge Convolution and Transformer Architecture
• Exploring an image-based $b$-jet tagging method using convolution neural networks
• A novel method for reconstruction of collision vertices at high-intensity hadron colliders
• Leveraging intermediate resonances to probe CP violation at colliders