https://doi.org/10.1140/epjc/s10052-022-10186-3
Regular Article - Experimental Physics
Search for massive long-lived particles decaying semileptonically at 
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Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil
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Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
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Center for High Energy Physics, Tsinghua University, Beijing, China
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Institute of High Energy Physics (IHEP), Beijing, China
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School of Physics State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China
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University of Chinese Academy of Sciences, Beijing, China
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Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China
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Univ. Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, France
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Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France
10
Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France
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Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
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Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France
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LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France
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I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany
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Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
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Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
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Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
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School of Physics, University College Dublin, Dublin, Ireland
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INFN Sezione di Bari, Bari, Italy
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INFN Sezione di Bologna, Bologna, Italy
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INFN Sezione di Ferrara, Ferrara, Italy
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INFN Sezione di Firenze, Florence, Italy
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INFN Laboratori Nazionali di Frascati, Frascati, Italy
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INFN Sezione di Genova, Genoa, Italy
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INFN Sezione di Milano, Milan, Italy
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INFN Sezione di Milano-Bicocca, Milan, Italy
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INFN Sezione di Cagliari, Monserrato, Italy
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Universita degli Studi di Padova, Universita e INFN, Padova, Padua, Italy
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INFN Sezione di Pisa, Pisa, Italy
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INFN Sezione di Roma La Sapienza, Rome, Italy
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INFN Sezione di Roma Tor Vergata, Rome, Italy
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Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
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Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands
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Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Kraków, Poland
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Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
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National Center for Nuclear Research (NCBJ), Warsaw, Poland
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Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
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Petersburg Nuclear Physics Institute NRC Kurchatov Institute (PNPI NRC KI), Gatchina, Russia
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Institute for Nuclear Research of the Russian Academy of Sciences (INR RAS), Moscow, Russia
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Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia
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Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia
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Yandex School of Data Analysis, Moscow, Russia
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Budker Institute of Nuclear Physics (SB RAS), Novosibirsk, Russia
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Institute for High Energy Physics NRC Kurchatov Institute (IHEP NRC KI), Protvino, Russia
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ICCUB, Universitat de Barcelona, Barcelona, Spain
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Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
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Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia-CSIC, Valencia, Spain
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European Organization for Nuclear Research (CERN), Geneva, Switzerland
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Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
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Physik-Institut, Universität Zürich, Zurich, Switzerland
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NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
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Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine
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University of Birmingham, Birmingham, UK
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H.H. Wills Physics Laboratory, University of Bristol, Bristol, UK
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Cavendish Laboratory, University of Cambridge, Cambridge, UK
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Department of Physics, University of Warwick, Coventry, UK
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STFC Rutherford Appleton Laboratory, Didcot, UK
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School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK
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School of Physics and Astronomy, University of Glasgow, Glasgow, UK
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Oliver Lodge Laboratory, University of Liverpool, Liverpool, UK
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Imperial College London, London, UK
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Department of Physics and Astronomy, University of Manchester, Manchester, UK
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Department of Physics, University of Oxford, Oxford, UK
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Massachusetts Institute of Technology, Cambridge, MA, USA
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University of Cincinnati, Cincinnati, OH, USA
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University of Maryland, College Park, MD, USA
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Los Alamos National Laboratory (LANL), Los Alamos, USA
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Syracuse University, Syracuse, NY, USA
69
School of Physics and Astronomy, Monash University, Melbourne, Australia
70
Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil
71
Physics and Micro Electronic College, Hunan University, Changsha, China
72
Guangdong Provincial Key Laboratory of Nuclear Science, Guangdong-Hong Kong Joint Laboratory of Quantum Matter, Institute of Quantum Matter, South China Normal University, Guangzhou, China
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School of Physics and Technology, Wuhan University, Wuhan, China
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Departamento de Fisica, Universidad Nacional de Colombia, Bogotá, Colombia
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Universität Bonn-Helmholtz-Institut für Strahlen und Kernphysik, Bonn, Germany
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Institut für Physik, Universität Rostock, Rostock, Germany
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Eotvos Lorand University, Budapest, Hungary
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INFN Sezione di Perugia, Perugia, Italy
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Van Swinderen Institute, University of Groningen, Groningen, The Netherlands
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Universiteit Maastricht, Maastricht, The Netherlands
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National Research Centre Kurchatov Institute, Moscow, Russia
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National Research University Higher School of Economics, Moscow, Russia
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National University of Science and Technology “MISIS”, Moscow, Russia
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National Research Tomsk Polytechnic University, Tomsk, Russia
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DS4DS, La Salle, Universitat Ramon Llull, Barcelona, Spain
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Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden
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University of Michigan, Ann Arbor, USA
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Universidade Federal do Triângulo Mineiro (UFTM), Uberaba, MG, Brazil
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Hangzhou Institute for Advanced Study, UCAS, Hangzhou, China
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Università di Bari, Bari, Italy
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Università di Bologna, Bologna, Italy
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Università di Cagliari, Cagliari, Italy
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Università di Ferrara, Ferrara, Italy
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Università di Firenze, Florence, Italy
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Università di Genova, Genoa, Italy
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Università degli Studi di Milano, Milan, Italy
97
Università di Milano Bicocca, Milan, Italy
98
Università di Modena e Reggio Emilia, Modena, Italy
99
Università di Padova, Padua, Italy
100
Scuola Normale Superiore, Pisa, Italy
101
Università di Pisa, Pisa, Italy
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Università della Basilicata, Potenza, Italy
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Università di Roma Tor Vergata, Rome, Italy
104
Università di Siena, Siena, Italy
105
Università di Urbino, Urbino, Italy
106
MSU-Iligan Institute of Technology (MSU-IIT), Iligan, Philippines
107
Faculty of Computer Science, Electronics and Telecommunications, AGH-University of Science and Technology, Kraków, Poland
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P.N. Lebedev Physical Institute, Russian Academy of Science (LPI RAS), Moscow, Russia
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Novosibirsk State University, Novosibirsk, Russia
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Hanoi University of Science, Hanoi, Vietnam
111
CERN, 1211, Geneva 23, Switzerland
Received:
18
October
2021
Accepted:
6
March
2022
Published online:
28
April
2022
A search is performed for massive long-lived particles (LLPs) decaying semileptonically into a muon and two quarks. Two kinds of LLP production processes were considered. In the first, a Higgs-like boson with mass from 30 to 200
is produced by gluon fusion and decays into two LLPs. The analysis covers LLP mass values from 10 up to about one half the Higgs-like boson mass. The second LLP production mode is directly from quark interactions, with LLP masses from 10 to 90. The LLP lifetimes considered range from 5 to 200 ps. This study uses LHCb data collected from proton-proton collisions at 
, corresponding to an integrated luminosity of 5.4
. No evidence of these long-lived states has been observed, and upper limits on the production cross-section times branching ratio have been set for each model considered.
© The Author(s) 2022
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