Observation of a pseudoscalar excess at the top quark pair production threshold

A search for resonances in top quark pair ($\text{t}\bar{\text{t}}$) production in final states with two charged leptons and multiple jets is presented, based on proton-proton collision data collected by the CMS experiment at the CERN LHC at $\sqrt{s}$ = 13 TeV, corresponding to 138 fb$^{-1}$. The analysis explores the invariant mass of the \ttbar system and two angular observables that provide direct access to the correlation of top quark and antiquark spins. A significant excess of events is observed near the kinematic $\text{t}\bar{\text{t}}$ threshold compared to the nonresonant production predicted by fixed-order perturbative quantum chromodynamics (pQCD). The observed enhancement is consistent with the production of a color-singlet pseudoscalar ($^1$S$^{[1]}_0$) quasi-bound toponium state, as predicted by nonrelativistic quantum chromodynamics. Using a simplified model for $^1$S$^{[1]}_0$ toponium, the cross section of the excess above the pQCD prediction is measured to be 8.8$^{+1.2}_{-1.4}$ pb.

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DESY Publication Database (PUBDB) (Deutsches Elektronen-Synchrotron)
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2025-01-01
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Particle physics theoretical and experimental studies
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article

Observation of a pseudoscalar excess at the top quark pair production threshold

A. Santoro, T. Reis, S. Polikarpov, A. Vilela Pereira et al.
DESY Publication Database (PUBDB) (Deutsches Elektronen-Synchrotron)
Particle physics theoretical and experimental studies
article

Observation of a pseudoscalar excess at the top quark pair production threshold

A. Santoro, T. Reis, S. Polikarpov, A. Vilela Pereira, A. Vagnerini, Yeonjoon Kim, R. K. Singh, K. Rabbertz, P. G. Kosmoglou Kioseoglou, U. Goerlach, J. Alexander, G. Cummings, V. Brigljević, S. Bansal, M. M. A. Gadallah, J. Lidrych, Ryan Mccarthy, P. Azzurri, A. Gurrola, B. Hacışahinoğlu, Shivam Raj, V. D’Amante, Lovisa Rygaard, James Natoli, Justin Anguiano, I. Lomidze, B. Blumenfeld, P. Zehetner, Muhammad Aamir Shahzad, K. Piotrzkowski, H. Oğul, Aashay Arora, Magdy Louka, Sabrina Giorgetti, A. Lapertosa, G. Sorrentino, M. Horzela, A. Harilal, A. Mecca, Farouk Mokhtar, K. Shchelina, Soumik Chandra, A. Tarabini, B. Akgün, M. Stamenkovic, Jihoon Shin, B. M. Joshi, M. Presilla, G. Milella, A. Reimers, Daniil Rastorguev, S. Mishra, Aurora Perego, W. Lustermann, D. R. Claes, Aman Rohilla, I. Dutta, R. Klanner, Oleg Teryaev, Leonardo Lanteri, N. Bacchetta, D. Contardo, A. Escalante Del Valle, Y. Lai, F. De Guio, C. Fangmeier, Ruben Gargiulo, Dharmender Dharmender, M. Vojinoviç, J. Luo, F. 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article en

Abstract

A search for resonances in top quark pair ($\text{t}\bar{\text{t}}$) production in final states with two charged leptons and multiple jets is presented, based on proton-proton collision data collected by the CMS experiment at the CERN LHC at $\sqrt{s}$ = 13 TeV, corresponding to 138 fb$^{-1}$. The analysis explores the invariant mass of the \ttbar system and two angular observables that provide direct access to the correlation of top quark and antiquark spins. A significant excess of events is observed near the kinematic $\text{t}\bar{\text{t}}$ threshold compared to the nonresonant production predicted by fixed-order perturbative quantum chromodynamics (pQCD). The observed enhancement is consistent with the production of a color-singlet pseudoscalar ($^1$S$^{[1]}_0$) quasi-bound toponium state, as predicted by nonrelativistic quantum chromodynamics. Using a simplified model for $^1$S$^{[1]}_0$ toponium, the cross section of the excess above the pQCD prediction is measured to be 8.8$^{+1.2}_{-1.4}$ pb.

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University College Dublin (IE), Rutgers, The State University of New Jersey (US), Karlsruhe Institute of Technology (DE), Tbilisi State University (GE), University of California, Riverside (US), Eötvös Loránd University (HU), Florida Institute of Technology (US), Warsaw University of Technology (PL), University of Delhi (IN), Boston University (US), Chonnam National University (KR), University of Nebraska–Lincoln (US), Suez Canal University (EG), Buffalo State University (US), Purdue University Northwest (US), Tata Institute of Fundamental Research (IN), California Institute of Technology (US), Texas Tech University (US), University of Seoul (KR), Quaid-i-Azam University (PK), Wayne State College (US), University of Ruhuna (LK), European Union of Medical Specialists (BE), Visva-Bharati University (IN), University of Wisconsin System (US), Fermi National Accelerator Laboratory (US), Georgian Technical University (GE), A. Alikhanyan National Laboratory (AM), University of Debrecen (HU), Sharif University of Technology (IR), Gangneung–Wonju National University (KR), Vrije Universiteit Brussel (BE), Kafkas University (TR), École Polytechnique (FR), Johns Hopkins University (US), Cairo University (EG), Ipca Laboratories (India) (IN), TU Wien (AT), University of Kansas (US), Bingöl University (TR), Democritus University of Thrace (GR), University of Antwerp (BE), Nanjing Normal University (CN), British University in Egypt (EG), University of California, Santa Barbara (US), Scuola Normale Superiore (IT), Chulalongkorn University (TH), National Institute of Science Education and Research (IN), Universidad de Oviedo (ES), Indian Institute of Science Education and Research Mohali (IN), National Taiwan University (TW), Isfahan University of Technology (IR), Forschungszentrum Jülich (DE), University of Alabama (US), Vilnius University (LT), John Brown University (US), Erzincan Binali Yıldırım University (TR), California Lutheran University (US), NTL Institute for Applied Behavioral Science (US), Indian Institute of Science Education and Research Pune (IN), University of Tarapacá (CL), South China Normal University (CN), United States Naval Academy (US), Yonsei University (KR), University of Ioannina (GR), Adıyaman University (TR), Middle East Technical University (TR), University of Basilicata (IT), Universidad Iberoamericana (MX), Cornell University (US), Charles University (CZ), Purdue University West Lafayette (US), National Central University (TW), Indian Institute of Technology Madras (IN), Fudan University (CN), University of Tennessee System (US), LIP - Laboratory of Instrumentation and Experimental Particle Physics (PT), Helsinki Institute of Physics (FI), University of Minnesota System (US), Université de Haute-Alsace (FR), Marconi University (IT), At Bristol (GB), Malayan Colleges Laguna (PH), University of Colorado System (US), University of Nebraska System (US), Saint Thomas - Rutherford Hospital (US), Sejong University (KR), Institut Pluridisciplinaire Hubert Curien (FR), EIA University (CO), ShanghaiTech University (CN), Notre Dame of Dadiangas University (PH), National Institute of Chemical Physics and Biophysics (EE), Universidade Federal de Santa Maria (BR), Universidad Iberoamericana (DO), University of Malaya (MY), University of Cyprus (CY), ETH Zurich (CH), Kyung Hee University (KR), Universidad de Antioquia (CO), University of Bristol (GB), University of California San Diego (US), Kuwait University (KW), University of Hyderabad (IN), Universidade do Estado do Rio de Janeiro (BR), University of Chicago (US), Universidad de Sonora (MX), University of Belgrade (RS), Institute of Physics, Bhubaneshwar (IN), Yıldız Technical University (TR), Universitas Malahayati (ID), Vilnius University of Applied Sciences (LT), Urology of Virginia (US), Riga High Tech University (LV), Gene Therapy Laboratory (FR), Institute for Particle and Nuclear Physics (HU), Chonnam National University Hospital (KR), Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering (RO), Universidad de América (CO), Rutgers Sexual and Reproductive Health and Rights (NL), National Centre for Nuclear Research (PL), Grade Medical (Czechia) (CZ), Laboratori Guglielmo Marconi (Italy) (IT), Genoa (Brazil) (BR), Bethel College (US), Istituto Nazionale di Fisica Nucleare, Sezione di Torino (IT), Northwestern University (PH), National Polytechnic School (EC), Istituto Nazionale di Fisica Nucleare, Sezione di Pavia (IT), Universidad de Puebla (MX), Bristol Hospital (US), Florence (Netherlands) (NL), Istituto Nazionale di Fisica Nucleare, Sezione di Bari (IT), Franciscan University (BR), Istituto Nazionale di Fisica Nucleare, Sezione di Catania (IT), Unidades Centrales Científico-Técnicas (ES), Techin (Poland) (PL), Istinye University (TR), Ruđer Bošković Institute (HR), Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Genova (IT), Sofie Biosciences (United States) (US), Florida Department of State (US), St. Charles Hospital (US), Naples Anesthesia & Physician Associates (US), Vienna Institute for Nature Conservation & Analyses (AT), Canterbury College (GB), Institute of High Energy Physics (CN), University of Science and Technology of Mazandaran (IR), Istituto Nazionale di Fisica Nucleare, Sezione di Milano Bicocca (IT), Institute for Scintillation Materials (UA), SurgOne Foregut Institute (US), Brandenburg University of Applied Sciences (DE), Istituto Nazionale di Fisica Nucleare, Sezione di Bologna (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Trieste (IT), Instituto de Física de Cantabria (ES), Institute of Nuclear Physics of Lyon (FR), Stefan Meyer Institute for Subatomic Physics (AT), Istituto Nazionale di Fisica Nucleare, Sezione di Roma I (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Pisa (IT), Frascati Scienza (IT), Abiola Ajimobi Technical University Ibadan (NG), Vanderbilt Health (US), Bethel University (US), Istituto Nazionale di Fisica Nucleare, Sezione di Perugia (IT), Institut de Recherche sur les Lois Fondamentales de l'Univers (FR), Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (ES), Shorter College (US), State Library of Ohio (US), University of Southampton (GB), Johns Hopkins University School of Advanced International Studies, Boğaziçi University (TR), Indian Institute of Management Bangalore (IN), Hanyang University (KR), Karamanoğlu Mehmetbey University (TR), University of Warsaw (PL), Istanbul Technical University (TR), Panjab University (IN), University of Rochester (US), University of Turin (IT), University of Bari Aldo Moro (IT), Cukurova University (TR), Indian Institute of Science Bangalore (IN), University of Montenegro (ME), Brunel University of London (GB), University of Puerto Rico-Mayaguez (PR), University at Buffalo, State University of New York (US), Lappeenranta-Lahti University of Technology (FI), Tunis El Manar University (TN), Universidad Autónoma de Madrid (ES), Indian Institute of Technology Hyderabad (IN), Fayoum University (EG), Hacettepe University (TR), Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (MX), AGH University of Krakow (PL), University of West Alabama (US), Universidad San Francisco de Quito (EC), Athens State University (US), Rice University (US), Marmara University (TR), Carnegie Mellon University (US), Sinop University (TR), Beihang University (CN), Helwan University (EG), University of California, Davis (US), Sungkyunkwan University (KR), Modern Academy (EG), Bethel University (US), University of Colombo (LK), University of Split (HR), Indian Institute of Technology Kanpur (IN), UCLouvain (BE), Tsinghua University (CN), Indian Institute of Technology Bhubaneswar (IN), FH Aachen (DE)
National Science Foundation, U.S. Department of Energy, Alfred P. Sloan Foundation, Alexander von Humboldt-Stiftung, Nvidia, Weston Havens Foundation, CERN, Türkiye Enerji, Nükleer ve Maden Araştırma Kurumu, European Commission, Department of Science and Technology, Ministry of Science and Technology, India, Science Foundation Ireland, Deutsche Forschungsgemeinschaft, Fundação de Amparo à Pesquisa do Estado de São Paulo, National Natural Science Foundation of China, Ministerstvo Školství, Mládeže a Tělovýchovy, Fonds National de la Recherche Luxembourg, National Science Council, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Bundesministerium für Bildung und Forschung, Austrian Science Fund, Fonds De La Recherche Scientifique - FNRS, Fonds Wetenschappelijk Onderzoek, Consejo Nacional de Ciencia y Tecnología, Ministerio de Economía y Competitividad, Bulgarian National Science Fund, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Ministry of Science, ICT and Future Planning, Magyar Tudományos Akadémia, A.G. Leventis Foundation, National Science and Technology Development Agency, Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul, Secretaría de Educación Superior, Ciencia, Tecnología e Innovación, Türkiye Bilimsel ve Teknolojik Araştırma Kurumu, Ministry of Education, India, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, National Academy of Sciences of Ukraine, Centre National de la Recherche Scientifique, Shota Rustaveli National Science Foundation, Universidad Autónoma de San Luis Potosí, Latvijas Zinātnes Padome, Benemérita Universidad Autónoma de Puebla, Pakistan Atomic Energy Commission, Ministry of Science,Technology and Research, Nemzeti Kutatási Fejlesztési és Innovációs Hivatal, Hellenic Foundation for Research and Innovation, Ministry of Higher Education, Science, Research and Innovation, Thailand, Qatar National Research Fund, Science and Technology Facilities Council, Fundação para a Ciência e a Tecnologia, Fonds pour la Formation à la Recherche dans l’Industrie et dans l’Agriculture, European Regional Development Fund, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Agencia Estatal de Investigación, Fundamental Research Funds for the Central Universities, Institut National de Physique Nucléaire et de Physique des Particules
Openalex Percentile: Top 87%
Particle physics theoretical and experimental studies
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