Search for new physics using effective field theory in 13 TeV pp collision events that contain a top quark pair and a boosted Z or Higgs boson

作     者：Sirunyan, A.M. Tumasyan, A. Adam, W. Ambrogi, F. Bergauer, T. Dragicevic, M. Erö, J. Escalante Del Valle, A. Frühwirth, R. Jeitler, M. Krammer, N. Lechner, L. Liko, D. Madlener, T. Mikulec, I. Pitters, F.M. Rad, N. Schieck, J. Schöfbeck, R. Spanring, M. Templ, S. Waltenberger, W. Wulz, C.-E. Zarucki, M. Chekhovsky, V. Litomin, A. Makarenko, V. Suarez Gonzalez, J. Darwish, M.R. De Wolf, E.A. Di Croce, D. Janssen, X. Kello, T. Lelek, A. Pieters, M. Rejeb Sfar, H. Van Haevermaet, H. Van Mechelen, P. Van Putte, S. Van Remortel, N. Blekman, F. Bols, E.S. Chhibra, S.S. D'Hondt, J. De Clercq, J. Lontkovskyi, D. Lowette, S. Marchesini, I. Moortgat, S. Morton, A. Python, Q. Tavernier, S. Van Doninck, W. Van Mulders, P. Beghin, D. Bilin, B. Clerbaux, B. De Lentdecker, G. Dorney, B. Favart, L. Grebenyuk, A. Kalsi, A.K. Makarenko, I. Moureaux, L. Pétré, L. Popov, A. Postiau, N. Starling, E. Thomas, L. Vander Velde, C. Vanlaer, P. Vannerom, D. Wezenbeek, L. Cornelis, T. Dobur, D. Gruchala, M. Khvastunov, I. Niedziela, M. Roskas, C. Skovpen, K. Tytgat, M. Verbeke, W. Vermassen, B. Vit, M. Bruno, G. Bury, F. Caputo, C. David, P. Delaere, C. Delcourt, M. Donertas, I.S. Giammanco, A. Lemaitre, V. Mondal, K. Prisciandaro, J. Taliercio, A. Teklishyn, M. Vischia, P. Wuyckens, S. Zobec, J. Alves, G.A. Correia Silva, G. Hensel, C. Moraes, A. Aldá, W.L. Belchior Batista Das Chagas, E. Brandao Malbouisson, H. Carvalho, W. Chinellato, J. Coelho, E. Da Costa, E.M. Da Silveira, G.G. De Jesus Damiao, D. Fonseca De Souza, S. Martins, J. Matos Figueiredo, D. Medina Jaime, M. Melo De Almeida, M. Mora Herrera, C. Mundim, L. Nogima, H. Rebello Teles, P. Sanchez Rosas, L.J. Santoro, A. Silva Do Amaral, S.M. Sznajder, A. Thiel, M. Tonelli Manganote, E.J. Torres Da Silva De Araujo, F. Vilela Pereira, A. Bernardes, C.A. Calligaris, L. Fernandez Perez Tomei, T.R. Gregores, E.M. Lemos, D.S. Mercadante, P.G. Novaes, S.F. Padula, Sandra S. Aleksandrov, A. Antchev, G. Atanasov, I. Hadjiiska, R. Iaydjiev, P. Misheva, M. Rodozov, M. Shopova, M. Sultanov, G. Bonchev, M. 

作者机构：Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Wien Austria Institute for Nuclear Problems Minsk Belarus Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista São Paulo Brazil Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Beihang University Beijing China Department of Physics Tsinghua University Beijing China Institute of High Energy Physics Beijing China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Sun Yat-Sen University Guangzhou China  Fudan University Shanghai China Zhejiang University Hangzhou China Universidad de Los Andes Bogota Colombia Universidad de Antioquia Medellin Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt  Fayoum University El-Fayoum Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics University of Helsinki Helsinki Finland Helsinki Institute of Physics Helsinki Finland Lappeenranta University of Technology Lappeenranta Finland IRFU CEA Université Paris-Saclay Gif-sur-Yvette France Laboratoire Leprince-Ringuet CNRS IN 2P 3 Ecole Polytechnique Institut Polytechnique de Paris Palaiseau France Université de Strasbourg CNRS IPHC UMR 7178 Strasbourg France Université de Lyon Université Claude Bernard Lyon 1 CNRS-IN 2P 3 Institut de Physique Nucléaire de Lyon Villeurbanne France Georgian Technical University Tbilisi Georgia RWTH Aachen University I. Physikalisches Institut Aachen Germany RWTH Aachen University III. Physikalisches Institut A Aachen Germany RWTH Aachen University III. Physikalisches Institut B Aachen Germany Deutsches Elektronen-Synchrotron Hamburg Germany University of Hamburg Hamburg Germany Karlsruher Institut fuer Technologie Karlsruhe Germany  NCSR Demokritos Aghia Paraskevi Greece National and Kapodistrian University of Athens Athens Greece National Technical University of Athens Athens Greece University of Ioánnina Ioánnina Greece MTA-ELTE Lendület CMS Particle and Nuclear Physics Group Eötvös Loránd University Budapest Hungary Wigner Research Centre for Physics Budapest Hungary Institute of Nuclear Research ATOMKI Debrecen Hungary Institute of Physics University of Debrecen Debrecen Hungary Eszterhazy Karoly University Karoly Robert Campus Gyongyos Hungary  Bangalore India National Institute of Science Education and Research HBNI Bhubaneswar India Panjab University Chandigarh India University of Delhi Delhi India Saha Institute of Nuclear Physics HBNI Kolkata India Indian Institute of Technology Madras Madras India Bhabha Atomic Research Centre Mumbai India Tata Institute of Fundamental Research-A Mumbai India Tata Institute of Fundamental Research-B Mumbai India  Pune India Department of Physics Isfahan University of Technology Isfahan Iran  Tehran Iran University College Dublin Dublin Ireland INFN Sezione di Bari Bari Italy Università di Bari Bari Italy Politecnico di Bari Bari Italy INFN Sezione di Bologna Bologna Italy Università di Bologna Bologna Italy INFN Sezione di Catania Catania Italy Università di Catania Catania Italy INFN Sezione di Firenze Firenze Italy Università di Firenze Firenze Italy INFN Laboratori Nazionali di Frascati Frascati Italy INFN Sezione di Genova Genova Italy Università di Genova Genova Italy INFN Sezione di Milano-Bicocca Milano Italy Università di Milano-Bicocca Milano Italy INFN Sezione di Napoli Napoli Italy Università di Napoli 'Federico II' Napoli Italy Università della Basilicata Potenza Italy Università G. Marconi Roma Italy INFN Sezione di Padova Padova Italy Università di Padova Padova Italy Università di Trento Trento Italy INFN Sezione di Pavia Pavia Italy Università di Pavia Pavia Italy INFN Sezione di Perugia Perugia Italy Università di Perugia Perugia Italy INFN Sezione di Pisa Pisa Italy Università di Pisa Pisa Italy Scuola Normale Superiore di Pisa Pisa Italy Università di Siena Siena Italy INFN Sezione di Roma Rome Italy Sapienza Università di Roma Rome Italy INFN Sezione di Torino Torino Italy 

出 版 物：《arXiv》 (arXiv)

年 卷 期：2022年

核心收录：

主　　题：Bosons 

摘      要：A data sample containing top quark pairs (tt) produced in association with a Lorentz-boosted Z or Higgs boson is used to search for signs of new physics using effective field theory. The data correspond to an integrated luminosity of 138 fb−1 of proton-proton collisions produced at a center-of-mass energy of 13 TeV at the LHC and collected by the CMS experiment. Selected events contain a single lepton and hadronic jets, including two identified with the decay of bottom quarks, plus an additional large-radius jet with high transverse momentum identified as a Z or Higgs boson decaying to a bottom quark pair. Machine learning techniques are employed to discriminate between ttZ or ttH events and events from background processes, which are dominated by tt + jets production. No indications of new physics are observed. The signal strengths of boosted ttZ and ttH production are measured, and upper limits are placed on the ttZ and ttH differential cross sections as functions of the Z or Higgs boson transverse momentum. The effects of new physics are probed using a framework in which the standard model is considered to be the low-energy effective field theory of a higher energy scale theory. Eight possible dimension-six operators are added to the standard model Lagrangian and their corresponding coefficients are constrained via fits to the data. © 2022, CC BY.