Measurement of lepton differential distributions and the top quark mass in t ̄t production in pp collisions at √s = 8 TeV with the ATLAS detector
This paper presents single lepton and dilepton kinematic distributions measured in dileptonic t ̄t events produced in 20.2 fb<sup>−1</sup> of √s = 8 TeV pp collisions recorded by the ATLAS experiment at the LHC. Both absolute and normalised differential cross-sections are measured, using...
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| Autores principales: | , , , , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2017
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/79758 |
| Aporte de: |
| Sumario: | This paper presents single lepton and dilepton kinematic distributions measured in dileptonic t ̄t events produced in 20.2 fb<sup>−1</sup> 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 lep- tons, 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 m<sup>pole</sup><sub>t</sub> = 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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