Measurement of the tt¯ production cross-section and lepton differential distributions in eμ dilepton events from pp collisions at s√=13TeV with the ATLAS detector
Year: 2020
Type: article
Abstract: The inclusive top quark pair (tt ¯) production cross-section σtt ¯ has been measured in proton–proton collisions at √s = 13 TeV, using 36.1 fb−1 of data collected in 2015–2016 by the ATLAS experiment at the LHC. Using events with an opposite-charge eμ pair and b-tagged jets, the cross-section is measured to be: \n \nσtt ¯ = 826.4 ± 3.6 (stat) ± 11.5 (syst) ± 15.7 (lumi) ±1.9 (beam) pb, \n \nwhere the uncertainties reflect the limited size of the data sample, experimental and theoretical systematic effects, the integrated luminosity, and the LHC beam energy, giving a total uncertainty of 2.4%. The result is consistent with theoretical QCD calculations at next-to-next-to-leading order. It is used to determine the top quark pole mass via the dependence of the predicted cross-section on mpole t , giving mpole t = 173.1+2.0 −2.1 GeV. It is also combined with measurements at √s = 7 TeV and √s = 8 TeV to derive ratios and double ratios of tt ¯ and Z cross-sections at different energies. The same event sample is used to measure absolute and normalised differential cross-sections as functions of singlelepton and dilepton kinematic variables, and the results are compared with predictions from various Monte Carlo event generators.
Authors: Alonso, Francisco, Arduh, Francisco Anuar, Dova, María Teresa, Hoya, Joaquín, Monticelli, Fernando Gabriel, Orellana, Gonzalo Enrique, Wahlberg, Hernán Pablo, The ATLAS Collaboration
Institution: European Organization for Nuclear Research
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCIAS), CERN, Ministry of Education, Culture, Sports, Science and Technology, Danmarks Grundforskningsfond, Fundação de Amparo à Pesquisa do Estado de São Paulo, National Natural Science Foundation of China, Bundesministerium für Bildung und Forschung, Austrian Science Fund, Nederlandse Organisatie voor Wetenschappelijk Onderzoek, Bundesministerium für Wissenschaft, Forschung und Wirtschaft, General Secretariat for Research and Technology, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Israel Science Foundation, Max-Planck-Gesellschaft, Ministerstwo Edukacji i Nauki, Centre National de la Recherche Scientifique, Centre National pour la Recherche Scientifique et Technique, Services Fédéraux des Affaires Scientifiques, Techniques et Culturelles, Natural Sciences and Engineering Research Council of Canada, Japan Society for the Promotion of Science, Fundação para a Ciência e a Tecnologia, Comisión Nacional de Investigación Científica y Tecnológica, Agencia Nacional de Promoción Científica y Tecnológica, Institut National de Physique Nucléaire et de Physique des Particules
Awards: G1291875522, G8453086316
OpenAlex ID: W6983311351