Search for top-philic heavy resonances in pp collisions at s=13\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\sqrt{s}=13$$\end{document} TeV\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\text {TeV}$$\end{document} with the ATLAS detector

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作者：
机构：
[1] University of Adelaide,Department of Physics
[2] University of Alberta,Department of Physics
[3] Ankara University,Department of Physics
[4] TOBB University of Economics and Technology,Division of Physics
[5] LAPP,High Energy Physics Division
[6] Université Savoie Mont Blanc,Department of Physics
[7] CNRS/IN2P3,Department of Physics
[8] APC,Physics Department
[9] Université Paris Cité,Physics Department
[10] CNRS/IN2P3,Department of Physics
[11] Argonne National Laboratory,Institute of Physics
[12] University of Arizona,Institut de Física d’Altes Energies (IFAE)
[13] University of Texas at Arlington,Institute of High Energy Physics
[14] National and Kapodistrian University of Athens,Physics Department
[15] National Technical University of Athens,Department of Physics
[16] University of Texas at Austin,School of Science
[17] Azerbaijan Academy of Sciences,Institute of Physics
[18] Barcelona Institute of Science and Technology,Department for Physics and Technology
[19] Chinese Academy of Sciences,Physics Division
[20] Tsinghua University,Institut für Physik
[21] Nanjing University,Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics
[22] Shenzhen Campus of Sun Yat-sen University,School of Physics and Astronomy
[23] University of Chinese Academy of Science (UCAS),Department of Physics
[24] University of Belgrade,Department of Physics Engineering
[25] University of Bergen,Department of Physics
[26] Lawrence Berkeley National Laboratory,Facultad de Ciencias y Centro de Investigaciónes
[27] University of California,Departamento de Física
[28] Humboldt Universität zu Berlin,Dipartimento di Fisica e Astronomia A. Righi
[29] University of Bern,Physikalisches Institut
[30] University of Birmingham,Department of Physics
[31] Bogazici University,Department of Physics
[32] Gaziantep University,Department of Physics
[33] Istanbul University,Physics Department
[34] Istinye University,Faculty of Physics
[35] Universidad Antonio Nariño,Faculty of Mathematics, Physics and Informatics
[36] Universidad Nacional de Colombia,Department of Subnuclear Physics
[37] Pontificia Universidad Javeriana,Physics Department
[38] Università di Bologna,Departamento de Física, y CONICET, Facultad de Ciencias Exactas y Naturales, Instituto de Física de Buenos Aires (IFIBA)
[39] INFN Sezione di Bologna,Cavendish Laboratory
[40] Universität Bonn,Department of Physics
[41] Boston University,Department of Mechanical Engineering Science
[42] Brandeis University,National Institute of Physics
[43] Transilvania University of Brasov,Department of Physics
[44] Horia Hulubei National Institute of Physics and Nuclear Engineering,School of Physics
[45] Alexandru Ioan Cuza University of Iasi,Department of Physics
[46] National Institute for Research and Development of Isotopic and Molecular Technologies,Faculté des Sciences Ain Chock
[47] University Politehnica Bucharest,Faculté des Sciences
[48] West University in Timisoara,Faculté des Sciences Semlalia
[49] University of Bucharest,LPMR, Faculté des Sciences
[50] Comenius University,Faculté des sciences
来源：
The European Physical Journal C | / 84卷 / 2期
关键词：
D O I：
10.1140/epjc/s10052-023-12318-9
中图分类号：
学科分类号：
摘要：
A search for the associated production of a heavy resonance with a top-quark or a top-antitop-quark pair, and decaying into a tt¯\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$t{\bar{t}}$$\end{document} pair is presented. The search uses the data recorded by the ATLAS detector in pp collisions at s=13\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\sqrt{s}= 13$$\end{document} TeV\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\text {TeV}$$\end{document} at the Large Hadron Collider during the years 2015–2018, corresponding to an integrated luminosity of 139 fb-1\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\text {fb}^{-1}$$\end{document}. Events containing exactly one electron or muon are selected. The two hadronically decaying top quarks from the resonance decay are reconstructed using jets clustered with a large radius parameter of R=1\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$R=1$$\end{document}. The invariant mass spectrum of the two top quark candidates is used to search for a resonance signal in the range of 1.0 TeV\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\text {TeV}$$\end{document} to 3.2 TeV\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\text {TeV}$$\end{document}. The presence of a signal is examined using an approach with minimal model dependence followed by a model-dependent interpretation. No significant excess is observed over the background expectation. Upper limits on the production cross section times branching ratio at 95% confidence level are provided for a heavy Z′\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$Z^\prime $$\end{document} boson based on a simplified model, for Z′\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$Z^\prime $$\end{document} mass between 1.0 TeV\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\text {TeV}$$\end{document} and 3.0 TeV\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\text {TeV}$$\end{document}. The observed (expected) limits range from 21 (14) fb to 119 (86) fb depending on the choice of model parameters.
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