Determination of the top-quark pole mass using $t\bar{t}+1$-jet events collected with the ATLAS experiment in 7 TeV $pp$ collisions

Abstract

The normalized differential cross section for top-quark pair production in association with at least one jet is studied as a function of the inverse of the invariant mass of the $t\bar{t}+1$-jet system. This distribution can be used for a precise determination of the top-quark mass since gluon radiation depends on the mass of the quarks. The experimental analysis is based on proton-proton collision data collected by the ATLAS detector at the LHC with a centre-of-mass energy of 7 TeV corresponding to an integrated luminosity of 4.6 fb${}^{-1}$. The selected events were identified using the lepton+jets top-quark-pair decay channel, where lepton refers to either an electron or a muon. The observed distribution is compared to a theoretical prediction at next-to-leading-order accuracy in quantum chromodynamics using the pole-mass scheme. With this method, the measured value of the top-quark pole mass, $m_t^{\mathrm{pole}}$, is: $m_t^{\mathrm{pole}}$ =173.7 $\pm$ 1.5 (stat.) $\pm$ 1.4 (syst.) ${}_{-0.5}^{+1.0}$ (theory) GeV. This result represents the most precise measurement of the top-quark pole mass to date.

24 pages plus author list (40 pages total), 5 figures, 4 tables, published version, all figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2014-06/

References in corpus (22)

• PYTHIA 6.4 Physics and Manual
• Parton distributions for the LHC
• Big-Bang Nucleosynthesis
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• New parton distributions for collider physics
• Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions
• The global electroweak fit at NNLO and prospects for the LHC and ILC
• The PDF4LHC Working Group Interim Recommendations
• Parton Distributions for LO Generators
• Jet energy measurement and its systematic uncertainty in proton-proton collisions at $\sqrt{s}=7$ TeV with the ATLAS detector
• Measurement of the muon reconstruction performance of the ATLAS detector using 2011 and 2012 LHC proton-proton collision data
• Measuring the running top-quark mass
• Electron reconstruction and identification efficiency measurements with the ATLAS detector using the 2011 LHC proton-proton collision data
• NLO QCD corrections to t tbar + jet production at hadron colliders
• NLO QCD corrections to WWbb production at hadron colliders
• NLO QCD corrections to off-shell top-antitop production with leptonic decays at hadron colliders
• Measurement of the charge asymmetry in top quark pair production in pp collisions at sqrt(s) = 7 TeV using the ATLAS detector
• Hadronic top-quark pair production in association with a hard jet at next-to-leading order QCD: Phenomenological studies for the Tevatron and the LHC
• Measurements of normalized differential cross-sections for ttbar production in pp collisions at sqrt(s) = 7 TeV using the ATLAS detector
• Muon reconstruction efficiency and momentum resolution of the ATLAS experiment in proton-proton collisions at $\sqrt{s}$=7 TeV in 2010
• High precision fundamental constants at the TeV scale
• The Top Mass: Interpretation and Theoretical Uncertainties

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