Abstract
A determination of the top-quark mass is presented using 20.2 fb−1 of 8 TeV proton-proton collision data produced by the Large Hadron Collider and collected by the ATLAS experiment. The normalised differential cross section of top-quark pair production in association with an energetic jet is measured in the lepton+jets final state and unfolded to parton and particle levels. The unfolded distribution at parton level can be described using next-to-leading-order QCD predictions in terms of either the top-quark pole mass or the running mass as defined in the (modified) minimal subtraction scheme. A comparison between the experimental distribution and the theoretical prediction allows the top-quark mass to be extracted in the two schemes. The value obtained for the pole-mass scheme is:mtpole=171.1±0.4stat±0.9syst−0.3+0.7theoGeV\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$ {m}_t^{\\mathrm{pole}}=171.1\\pm 0.4\\left(\\mathrm{stat}\\right)\\pm 0.9{\\left(\\mathrm{syst}\\right)}_{-0.3}^{+0.7}\\left(\\mathrm{theo}\\right)\\;\\mathrm{GeV} $$\\end{document}The extracted value in the running-mass scheme is:mtmt=162.9±0.5stat±1.0syst−1.2+2.1theoGeV.\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$ {m}_t\\left({m}_t\\right)=162.9\\pm 0.5\\left(\\mathrm{stat}\\right)\\pm 1.0{\\left(\\mathrm{syst}\\right)}_{-1.2}^{+2.1}\\left(\\mathrm{theo}\\right)\\kern0.33em \\mathrm{GeV}. $$\\end{document}The results for the top-quark mass using the two schemes are consistent, when translated from one scheme to the other.
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