In:
Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2019, No. 11 ( 2019-11)
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: $$ {m}_t^{\mathrm{pole}}=171.1\pm 0.4\left(\mathrm{stat}\right)\pm 0.9{\left(\mathrm{syst}\right)}_{-0.3}^{+0.7}\left(\mathrm{theo}\right)\;\mathrm{GeV} $$ m t pole = 171.1 ± 0.4 stat ± 0.9 syst − 0.3 + 0.7 theo GeV The extracted value in the running-mass scheme is: $$ {m}_t\left({m}_t\right)=162.9\pm 0.5\left(\mathrm{stat}\right)\pm 1.0{\left(\mathrm{syst}\right)}_{-1.2}^{+2.1}\left(\mathrm{theo}\right)\kern0.33em \mathrm{GeV}. $$ m t m t = 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.
Type of Medium:
Online Resource
ISSN:
1029-8479
DOI:
10.1007/JHEP11(2019)150
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2019
detail.hit.zdb_id:
2027350-2