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

Published version
Peer-reviewed

Type

Article

Change log

Authors

Aad, G 
Abbott, B 
Abbott, DC 
Abdinov, O 
Abed Abud, A 

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^{\text{pole}} = 171.1 \pm 0.4 (\text{stat}) \pm 0.9 (\text{syst}) \substack{+0.7\ -0.3} (\text{theo}) \text{ GeV}. ] The extracted value in the running-mass scheme is: [ m_t(m_t) = 162.9 \pm 0.5 (\text{stat}) \pm 1.0 (\text{syst}) \substack{+2.1\ -1.2} (\text{theo}) \text{ GeV}. ] The results for the top-quark mass using the two schemes are consistent, when translated from one scheme to the other.

Description

Keywords

Hadron-Hadron scattering (experiments), Top physics

Journal Title

Journal of High Energy Physics

Conference Name

Journal ISSN

1126-6708
1029-8479

Volume Title

2019

Publisher

Springer Science and Business Media LLC
Sponsorship
Science and Technology Facilities Council (ST/N000234/1)