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

, The ATLAS collaboration (2017) Measurement of lepton differential distributions and the top quark mass in tt¯ production in pp collisions at √s=8 TeV with the ATLAS detector. European Physical Journal C: Particles and Fields (11). ISSN 1434-6044

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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 mtpole=173.2±0.9±0.8±1.2 GeV, where the three uncertainties arise from data statistics, experimental systematics, and theoretical sources.

Item Type:
Journal Article
Journal or Publication Title:
European Physical Journal C: Particles and Fields
Additional Information:
© CERN for the benefit of the ATLAS collaboration 2017 Funded by SCOAP3
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2200/2201
Subjects:
ID Code:
124040
Deposited By:
Deposited On:
13 Mar 2018 11:18
Refereed?:
Yes
Published?:
Published
Last Modified:
12 Jan 2021 06:06