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Measurement of lepton differential distributions and the top quark mass in tt¯ production in pp collisions at s√=8 TeV with the ATLAS detector
ATLAS Collaboration
ATLAS Collaboration
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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.
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2017-11-25
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SpringerOpen
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ATLAS_Collab_2017.pdf
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Aaboud, M., Aad, G., Abbott, B. et al. Eur. Phys. J. C (2017) 77: 804. https://doi.org/10.1140/epjc/s10052-017-5349-9