Measurement of the charge asymmetry in dileptonic decays of top quark pairs in $pp$ collisions at $\sqrt{s}=7$ TeV using the ATLAS detector

Abstract

A measurement of the top-antitop ($t\bar{t}$) charge asymmetry is presented using data corresponding to an integrated luminosity of 4.6 fb${}^{-1}$ of LHC $pp$ collisions at a centre-of-mass energy of 7 TeV collected by the ATLAS detector. Events with two charged leptons, at least two jets and large missing transverse momentum are selected. Two observables are studied: $A_{\text{C}}^{\ell \ell }$ based on the identified charged leptons, and $A_{\text{C}}^{t\bar{t}}$, based on the reconstructed $t\bar{t}$ final state. The asymmetries are measured to be \begin{eqnarray*} A^{\ell\ell}_{\textrm{C}} & = & 0.024 \pm 0.015 ~\textrm{(stat.)} \pm 0.009 ~\textrm{(syst.)}, \end{eqnarray*} \begin{eqnarray*} A^{t\bar{t}}_{\textrm{C}} & = & 0.021 \pm 0.025 ~\textrm{(stat.)} \pm 0.017 ~\textrm{(syst.)}. \end{eqnarray*} The measured values are in agreement with the Standard Model predictions.

arXiv comment33 pages plus author list + cover pages (57 pages total), 8 figures, 11 tables, published version, all figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2013-09/

References in corpus (66)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• The anti-k_t jet clustering algorithm
• Parton distributions for the LHC
• New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
• A New Method for Combining NLO QCD with Shower Monte Carlo Algorithms
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• New parton distributions for collider physics
• HERWIG 6.5: an event generator for Hadron Emission Reactions With Interfering Gluons (including supersymmetric processes)
• Parton distributions with LHC data
• ALPGEN, a generator for hard multiparton processes in hadronic collisions
• Matching NLO QCD computations and parton shower simulations
• The ATLAS Simulation Infrastructure
• Observation of Top Quark Production in Pbar-P Collisions
• The total top quark pair production cross-section at hadron colliders through O(alpha_S^4)
• Observation of the Top Quark
• Top++: a program for the calculation of the top-pair cross-section at hadron colliders
• A Positive-Weight Next-to-Leading-Order Monte Carlo for Heavy Flavour Hadroproduction
• An update on vector boson pair production at hadron colliders
• Tuning Monte Carlo Generators: The Perugia Tunes
• High-precision QCD at hadron colliders: electroweak gauge boson rapidity distributions at NNLO
• Two-loop soft anomalous dimensions for single top quark associated production with a W- or H-
• -- HATHOR -- HAdronic Top and Heavy quarks crOss section calculatoR
• Single-top hadroproduction in association with a W boson
• 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
• Topcolor Assisted Technicolor
• 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
• The CT10 NNLO Global Analysis of QCD
• Multiparton Interactions in Photoproduction at HERA
• Improved luminosity determination in pp collisions at sqrt(s) = 7 TeV using the ATLAS detector at the LHC
• Uncertainties on alpha_S in global PDF analyses and implications for predicted hadronic cross sections
• The PDF4LHC Working Group Interim Recommendations
• Hadronic top-quark pair production with NNLL threshold resummation
• Jet energy measurement and its systematic uncertainty in proton-proton collisions at $\sqrt{s}=7$ TeV with the ATLAS detector
• Performance of missing transverse momentum reconstruction in proton-proton collisions at 7 TeV with ATLAS
• Measurement of the muon reconstruction performance of the ATLAS detector using 2011 and 2012 LHC proton-proton collision data
• Parton Distributions for LHC
• Forward-backward asymmetry in top quark-antiquark production
• Electron reconstruction and identification efficiency measurements with the ATLAS detector using the 2011 LHC proton-proton collision data
• Jet energy resolution in proton-proton collisions at sqrt(s) = 7 TeV recorded in 2010 with the ATLAS detector
• Measurement of the top quark-pair production cross section with ATLAS in pp collisions at $\sqrt{s}=7\TeV$
• Effective-Field-Theory Approach to Top-Quark Production and Decay
• Measurement of the top quark forward-backward production asymmetry and its dependence on event kinematic properties
• Resolving the Tevatron Top Quark Forward-Backward Asymmetry Puzzle: Fully Differential Next-to-Next-to-Leading-Order Calculation
• Top quark and leptonic charge asymmetries for the Tevatron and LHC
• Top pair invariant mass distribution: a window on new physics
• Effective four-fermion operators in top physics: a roadmap
• Measurement of the Top Quark Mass Using Dilepton Events
• Probing the Tevatron t tbar asymmetry at LHC
• Top Quark Pairs at High Invariant Mass - A Model-Independent Discriminator of New Physics at the LHC
• Inclusive and differential measurements of the t t-bar charge asymmetry in proton-proton collisions at sqrt(s) = 7 TeV
• Massive color-octet bosons and the charge asymmetries of top quarks at hadron colliders
• Measurement of the forward-backward asymmetry in top quark-antiquark production in ppbar collisions using the lepton+jets channel
• Measurement of the top quark pair production charge asymmetry in proton-proton collisions at 7 TeV using the ATLAS detector
• Asymmetries in top quark pair production at hadron colliders
• Measurement of the inclusive leptonic asymmetry in top-quark pairs that decay to two charged leptons at CDF
• Measurement of the leptonic asymmetry in ttbar events produced in ppbar collisions at sqrt(s)=1.96 TeV
• Measurements of the t t-bar charge asymmetry using the dilepton decay channel in pp collisions at sqrt(s) = 7 TeV
• Probing Topcolor-Assisted Technicolor from Like-sign Top Pair Production at LHC
• Fully Bayesian Unfolding
• Data driving the top quark forward--backward asymmetry with a lepton-based handle
• Measurement of the forward-backward asymmetry in the distribution of leptons in $t\bar{t}$ events in the lepton+jets channel
• Application of the Principle of Maximum Conformality to the Top-Quark Charge Asymmetry at the LHC
• Portrait of a colour octet

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