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Measurement of lepton differential distributions and the top quark mass in &ITt&IT(&ITt&IT)over-bar production in &ITpp&IT collisions at a root&ITs & 8TeV with the ATLAS detector
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.ORCID-id: 0000-0001-6945-1916
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.
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Rekke forfattare: 29002017 (engelsk)Inngår i: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 77, nr 11, artikkel-id 804Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

This paper presents single lepton and dilepton kinematic distributions measured in dileptonic t(t)over-bar events produced in 20.2 fb(-1) of root 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 e mu 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 m(t)(pole) = 173.2 +/- 0.9 +/- 0.8 +/- 1.2 GeV, where the three uncertainties arise from data statistics, experimental systematics, and theoretical sources.

sted, utgiver, år, opplag, sider
SPRINGER , 2017. Vol. 77, nr 11, artikkel-id 804
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Identifikatorer
URN: urn:nbn:se:kth:diva-220889DOI: 10.1140/epjc/s10052-017-5349-9ISI: 000416369000001Scopus ID: 2-s2.0-85036663423OAI: oai:DiVA.org:kth-220889DiVA, id: diva2:1171825
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QC 20180108

Tilgjengelig fra: 2018-01-08 Laget: 2018-01-08 Sist oppdatert: 2018-01-08bibliografisk kontrollert

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