Measurement of the top quark mass in the tt¯→lepton+jets and tt¯→dilepton channels using s√=7 TeV ATLAS data

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Abstract

The top quark mass was measured in the channels t ¯t → lepton+jets and t ¯t → dilepton (lepton = e,μ) based on ATLAS data recorded in 2011. The data were
taken at theLHCwith a proton–proton centre-of-mass energy of √s = 7 TeV and correspond to an integrated luminosity of 4.6 fb−1. The t ¯t → lepton+jets analysis uses a three-dimensional template technique which determines
the top quark mass together with a global jet energy scale factor (JSF), and a relative b-to-light-jet energy scale factor (bJSF), where the terms b-jets and light-jets refer to jets originating from b-quarks and u, d, c, s-quarks or gluons,
respectively. The analysis of the t ¯t → dilepton channel exploits a one-dimensional template method using the mb observable, defined as the average invariant mass of the two lepton+b-jet pairs in each event. The top quark
mass is measured to be 172.33±0.75(stat + JSF + bJSF)±1.02(syst) GeV, and 173.79 ± 0.54(stat) ± 1.30(syst) GeV in the t ¯t → lepton+jets and t ¯t → dilepton channels, respectively. The combination of the two results yields mtop =
172.99 ± 0.48(stat) ± 0.78(syst) GeV, with a total uncertainty of 0.91 GeV.
Original languageEnglish
Article numberAad:2015nba
Pages (from-to)330
JournalEuropean Physical Journal C
VolumeC75
Issue number7
DOIs
Publication statusPublished - 17 Jul 2015

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