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Article
Report number arXiv:1507.01769 ; CERN-PH-EP-2015-100 ; CERN-PH-EP-2015-100
Title Determination of the top-quark pole mass using tt¯+1-jet events collected with the ATLAS experiment in 7 TeV pp collisions
Related titleDetermination of the top-quark pole mass using tt¯+1-jet events collected with the ATLAS experiment in 7 TeV pp collisions
Author(s) ATLAS Collaboration  Zeige alle 2834 Autoren
Publication 2015-10-19
Imprint 07 Jul 2015
Number of pages 23
Note 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/
In: JHEP 10 (2015) 121
DOI 10.1007/JHEP10(2015)121
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ATLAS
Free keywords flavor physics ; top physics ; experimental results
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 tt¯+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 fb1. 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, mtpole, is: mtpole =173.7 ± 1.5 (stat.) ± 1.4 (syst.) 0.5+1.0 (theory) GeV. This result represents the most precise measurement of the top-quark pole mass to date.
Copyright/License preprint: © 2015-2024 CERN (License: CC-BY-4.0)
publication: © 2015-2024 CERN (License: CC-BY-4.0), sponsored by SCOAP³



Corresponding record in: Inspire
Email contact: ATLAS-publication-committee-chair@cern.ch


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