Tools for estimating fake/non-prompt lepton backgrounds with the ATLAS detector at the LHC

Abstract

Measurements and searches performed with the ATLAS detector at the CERN Large Hadron Collider often involve signatures with one or more prompt leptons. Such analyses are subject to `fake/non-prompt' lepton backgrounds, where either a hadron or a lepton from a hadron decay or an electron from a photon conversion satisfies the prompt-lepton selection criteria. These backgrounds often arise within a hadronic jet because of particle decays in the showering process, particle misidentification or particle interactions with the detector material. As it is challenging to model these processes with high accuracy in simulation, their estimation typically uses data-driven methods. Three methods for carrying out this estimation are described, along with their implementation in ATLAS and their performance.

arXiv comment62 pages in total, author list starting page 45, 18 figures, 2 tables, published by JINST. All figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EGAM-2019-01/

References in corpus (31)

• The anti-k_t jet clustering algorithm
• An Introduction to PYTHIA 8.2
• FastJet user manual
• A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
• Parton distributions for the LHC Run II
• Parton distributions with LHC data
• The ATLAS Simulation Infrastructure
• Event Generation with Sherpa 2.2
• Pileup subtraction using jet areas
• Performance of the ATLAS Trigger System in 2015
• Production and Integration of the ATLAS Insertable B-Layer
• Electron and photon performance measurements with the ATLAS detector using the 2015-2017 LHC proton-proton collision data
• ATLAS $b$-jet identification performance and efficiency measurement with $t\bar{t}$ events in $pp$ collisions at $\sqrt{s}=13$ TeV
• Performance of electron and photon triggers in ATLAS during LHC Run 2
• Muon reconstruction and identification efficiency in ATLAS using the full Run 2 $pp$ collision data set at $\sqrt{s}=13$ TeV
• ATLAS data quality operations and performance for 2015-2018 data-taking
• Performance of missing transverse momentum reconstruction with the ATLAS detector using proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Jet energy scale and resolution measured in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Performance of the ATLAS muon triggers in Run 2
• Electron and photon energy calibration with the ATLAS detector using LHC Run 1 data
• Evidence for the associated production of the Higgs boson and a top quark pair with the ATLAS detector
• Search for chargino--neutralino pair production in final states with three leptons and missing transverse momentum in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector
• Extraction of the Width of the W Boson from Measurements of sigma(ppbar->W+X)B(W->e nu) and sigma(ppbar->Z+X)B(Z->e e) and their Ratio
• Charged-particle distributions in $\sqrt{s}=13$ TeV $pp$ interactions measured with the ATLAS detector at the LHC
• Studies of the muon momentum calibration and performance of the ATLAS detector with $pp$ collisions at $\sqrt{s}$=13 TeV
• Search for squarks and gluinos in final states with same-sign leptons and jets using 139 fb${}^{-1}$ of data collected with the ATLAS detector
• Measurement of $W^{\pm }{W}^{\pm }$ vector-boson scattering and limits on anomalous quartic gauge couplings with the ATLAS detector
• Search for supersymmetry in events with four or more charged leptons in $139\,\mbox{fb\(^{-1}\)}$ of $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector
• Statistics of weighted Poisson events and its applications
• Search for new phenomena in three- or four-lepton events in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Improving estimates of the number of fake leptons and other mis-reconstructed objects in hadron collider events: BoB's your UNCLE. (Previously "The Matrix Method Reloaded")

Cited by in corpus (14)

• Software and computing for Run 3 of the ATLAS experiment at the LHC
• Exploration at the high-energy frontier: ATLAS Run~2 searches investigating the exotic jungle beyond the Standard Model
• The quest to discover supersymmetry at the ATLAS experiment
• Measurement of the associated production of a top-antitop-quark pair and a Higgs boson decaying into a $b\bar{b}$ pair in $pp$ collisions at $\sqrt{s}=13$ TeV using the ATLAS detector at the LHC
• Search for a light charged Higgs boson in $t\to H^{\pm }b$ decays, with $H^{\pm }\to cs$, in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Climbing to the Top of the ATLAS 13 TeV data
• Search for a new $Z^{\prime }$ gauge boson via the $pp\to W^{\pm (\ast )}\to Z^{\prime }{\mu }^{\pm }\nu \to {\mu }^{\pm }{\mu }^{\mp }{\mu }^{\pm }\nu$ process in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Search for decays of the Higgs boson into a pair of pseudoscalar particles decaying into $b\bar{b}{\tau }^{+}{\tau }^{-}$ using $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Evidence for the dimuon decay of the Higgs boson in pp collisions with the ATLAS detector
• Sensitivity to longitudinal vector boson scattering and doubly-charged Higgs boson production in ${\mathbf{W}}^{\pm }{\mathbf{W}}^{\pm }\mathbf{jj}$ at future hadron colliders
• ATLAS searches for higgsinos with R-parity violating couplings in events with leptons
• Measurement of the Lund jet plane in hadronic decays of top quarks and W bosons with the ATLAS detector
• Search for heavy neutral leptons in decays of W bosons produced in 13 TeV pp collisions using prompt signatures in the ATLAS detector
• Search for new physics in jet multiplicity patterns of multilepton events at $\sqrt{s}$ = 13 TeV