Measurement of the top-quark mass in t t ¯ + 1-jet events collected with the ATLAS detector in pp collisions at s = 8 TeV

Abstract

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 The extracted value in the running-mass scheme is: mtmt=162.9±0.5stat±1.0syst−1.2+2.1theoGeV. The results for the top-quark mass using the two schemes are consistent, when translated from one scheme to the other

    Similar works

    Available Versions