Measurement of lepton differential distributions and the top quark mass in t(t)over-bar production in pp collisions at a root s=8TeV with the ATLAS detector



Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H
et al (show 2891 more authors) (2017) Measurement of lepton differential distributions and the top quark mass in t(t)over-bar production in pp collisions at a root s=8TeV with the ATLAS detector. European Physical Journal C: Particles and Fields, 77.

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Abstract

This paper presents single lepton and dilepton kinematic distributions measured in dileptonic tt¯ events produced in 20.2fb−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.

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 18 Dec 2017 09:07
Last Modified: 12 May 2021 09:03
DOI: 10.1140/epjc/s10052-017-5349-9
Open Access URL: http://doi.org/10.1140/epjc/s10052-017-5349-9
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3014286