Determination of the top-quark pole mass using tt¯tt¯ + 1-jet events collected with the ATLAS experiment in 7 TeV pp collisions


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The ATLAS collaboration A., Aad G., Abbott B., Abdallah J., Abdel Khalek S., Abdinov O., ...More

Journal of High Energy Physics, vol.2015, no.10, 2015 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 2015 Issue: 10
  • Publication Date: 2015
  • Doi Number: 10.1007/jhep10(2015)121
  • Journal Name: Journal of High Energy Physics
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Keywords: Hadron-Hadron Scattering, Top physics
  • Ankara University Affiliated: Yes

Abstract

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¯(Formula presented.) + 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, mt pole, is:mtpole=173.7±1.5stat.±1.4syst.−0.5+1.0theoryGeV.(Formula presented.). This result represents the most precise measurement of the top-quark pole mass to date.[Figure not available: see fulltext.]