Precise measurement of the tt¯ production cross-section and lepton differential distributions in eμ dilepton events from s=13TeVpp collisions with the ATLAS detector


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Zwalinski L., Zormpa O., Zorbas T., Zografos A., Zoch K., Zoccoli A., ...Daha Fazla

European Physical Journal C, cilt.86, sa.5, 2026 (SCI-Expanded, Scopus) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 86 Sayı: 5
  • Basım Tarihi: 2026
  • Doi Numarası: 10.1140/epjc/s10052-026-15311-0
  • Dergi Adı: European Physical Journal C
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Compendex, INSPEC, zbMATH, Directory of Open Access Journals, Nature Index
  • Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
  • İstanbul Üniversitesi Adresli: Evet

Özet

The inclusive top quark pair (tt¯) cross-section σtt¯ has been measured in proton–proton collisions at s=13TeV, using 140fb-1 of data collected by the ATLAS experiment at the Large Hadron Collider. Using events with an opposite-charge eμ pair and b-tagged jets, the cross-section is measured to be: (Formula presented.) where the uncertainties reflect the limited size of the data sample, experimental and theoretical systematic effects, the integrated luminosity, and the proton beam energy, giving a total uncertainty of 1.3%. The result is used to determine the top quark pole mass via the dependence of the predicted cross-section on mtpole, giving mtpole=172.8-1.7+1.5 GeV. The same event sample is used to measure absolute and normalised differential cross-sections for the tt¯→eμνν¯bb¯ process as a function of single-lepton and dilepton kinematic variables. Complementary measurements of eμbb¯ production, treating both tt¯ and Wt events as signal, are also provided. Both sets of differential cross-sections are compared to the predictions of various Monte Carlo event generators, demonstrating that the state-of-the-art generators Powheg MiNNLO and Powhegbb4l describe the data better than Powheghvq.