Measurement of lepton differential distributions and the top quark mass in tt¯ production in pp collisions at s√=8 TeV with the ATLAS detector

M. Aaboud, Paul Newman, ATLAS Collaboration

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25 Citations (Scopus)
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Abstract

This paper presents single lepton and dilepton kinematic distributions measured in dileptonic tt¯ events produced in 20.2 fb−1 of s√=8 TeV pp collisions recorded by the ATLAS experiment at the LHC. Both absolute and normalised differential cross-sections are measured, using events with an opposite-charge eμ pair and one or two b-tagged jets. The cross-sections are measured in a fiducial region corresponding to the detector acceptance for leptons, and are compared to the predictions from a variety of Monte Carlo event generators, as well as fixed-order QCD calculations, exploring the sensitivity of the cross-sections to the gluon parton distribution function. Some of the distributions are also sensitive to the top quark pole mass; a combined fit of NLO fixed-order predictions to all the measured distributions yields a top quark mass value of mpolet=173.2±0.9±0.8±1.2 GeV, where the three uncertainties arise from data statistics, experimental systematics, and theoretical sources.
Original languageEnglish
Article number804
JournalEuropean Physical Journal C
Volume77
DOIs
Publication statusPublished - 25 Nov 2017

Bibliographical note

84 pages in total, author list starting on page 68, 22 figures, 16 tables, published in EPJC. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2015-02/

Keywords

  • hep-ex

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