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

The ATLAS collaboration

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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 ± 0.4 (stat) ± 0.9 (syst)−0.3+0.7 (theo) GeV.

The extracted value in the running-mass scheme is: 

mt(mt) = 162.9 ± 0.5 (stat) ± 1.0 (syst)−1.2+2.1 (theo) GeV. 

The results for the top-quark mass using the two schemes are consistent, when translated from one scheme to the other.

Original languageEnglish
Article number150
Pages (from-to)1-39
Number of pages40
JournalJournal of High Energy Physics
Volume2019
Issue number11
DOIs
Publication statusPublished - Nov 2019
Externally publishedYes

Bibliographical note

Copyright the Author(s). Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Keywords

  • Hadron-Hadron scattering (experiments)
  • Top physics

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