Measurement of the tt production cross-section and lepton differential distributions in eμ dilepton events from pp collisions at √ s = 13 TeV with the ATLAS detector
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Springer
Date
2020-06-12Referencia bibliográfica
ATLAS Collaboration., Aad, G., Abbott, B. et al. Measurement of the t\bar{t} production cross-section and lepton differential distributions in e\mu dilepton events from pp collisions at \sqrt{s}=13\,\text {TeV} with the ATLAS detector. Eur. Phys. J. C 80, 528 (2020). [https://doi.org/10.1140/epjc/s10052-020-7907-9]
Patrocinador
ANPCyT; YerPhI, Armenia; Australian Research Council; BMWFW, Austria; Austrian Science Fund (FWF); Azerbaijan National Academy of Sciences (ANAS); SSTC, Belarus; National Council for Scientific and Technological Development (CNPq); Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP); Natural Sciences and Engineering Research Council of Canada; Canada Foundation for Innovation; Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT); National Natural Science Foundation of China (NSFC); Departamento Administrativo de Ciencia, Tecnologia e Innovacion Colciencias; Ministry of Education, Youth & Sports - Czech Republic Czech Republic Government; Czech Republic Government; DNRF, Denmark; Danish Natural Science Research Council; Centre National de la Recherche Scientifique (CNRS); CEA-DRF/IRFU, France; Federal Ministry of Education & Research (BMBF); Max Planck Society; Greek Ministry of Development-GSRT; RGC, China; Israel Science Foundation; Benoziyo Center, Israel; Istituto Nazionale di Fisica Nucleare (INFN); Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT); Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) Japan Society for the Promotion of Science; DNRF, Denmark; CNRST, Morocco; RCN, Norway; Ministry of Science and Higher Education, Poland; NCN, Poland; Portuguese Foundation for Science and Technology; MNE/IFA, Romania; NRC KI, Russia Federation; MESTD, Serbia; MSSR, Slovakia; Slovenian Research Agency - Slovenia; MIZS, Slovenia; MINECO, Spain; SRC, Sweden; Wallenberg Foundation, Sweden; SNSF Geneva, Switzerland; Ministry of Science and Technology, Taiwan; Ministry of Energy & Natural Resources - Turkey; Science & Technology Facilities Council (STFC); United States Department of Energy (DOE); National Science Foundation (NSF); BCKDF, Canada; CANARIE, Canada; CRC, Canada; European Research Council (ERC); European Union (EU); European Union (EU); French National Research Agency (ANR); French National Research Agency (ANR); German Research Foundation (DFG); Greek NSRF, Greece; BSF-NSF; German-Israeli Foundation for Scientific Research and Development; CERCA Programme Generalitat de Catalunya; PROMETEO Programme Generalitat Valenciana, Spain; Goran Gustafssons Stiftelse, Sweden; Royal Society of London; Leverhulme Trust; NRC, Canada; CERN; Chinese Academy of Sciences; Ministry of Science and Technology, China; SRNSFG, Georgia; HGF, Germany; Hong Kong SAR, China; Netherlands Organization for Scientific Research (NWO) Netherlands Government; MES of Russia; JINR; DST/NRF, South Africa; SERI Geneva, Switzerland; Cantons of Bern and Geneva, Switzerland; Compute Canada, Canada; Horizon 2020; Marie Sklodowska-Curie Actions; European Cooperation in Science and Technology (COST); Alexander von Humboldt Foundation; European Union (EU)Résumé
The inclusive top quark pair (t ¯t) production
cross-section σt ¯t has been measured in proton–proton collisions
at
√
s = 13 TeV, using 36.1fb−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:
σt ¯t = 826.4 ± 3.6 (stat) ± 11.5 (syst) ± 15.7 (lumi)
±1.9 (beam) pb,
where 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 t ¯t 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.