Accès ouvert déclaré 2025 article

Search for vector-like leptons with long-lived particle decays in the CMS muon system in proton-proton collisions at $\sqrt{s}$ = 13 TeV

V. Chekhovsky, A. Hayrapetyan, S. Ko, S. B. Oh, S. Ha, I. Yu, Q. Li, Sandra S. Padula, H. Qu, Y. An, R.-S. Lu, H. y. Wu, Z. Hu, R. Yi, K. W. Ho, J. W. Gary, C. Li, S. An, N. Lu, B. Li, K. Yi, G. Oh, C. Lu, D. Yu, I. Israr, J. Li, M. Lu, D. Li, An Gu, T. Carnahan, W. Li, H. He, M. Oh, A. Bethani, V. Re

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Résumé fourni par la source

A first search is presented for vector-like leptons (VLLs) decaying into a light long-lived pseudoscalar boson and a standard model $\tau$ lepton. The pseudoscalar boson is assumed to have a mass of 2 GeV and to decay exclusively into a pair of photons. It is identified using the CMS muon system. The analysis is carried out using a data set of proton-proton collisions at a center-of-mass energy of 13 TeV collected by the CMS experiment in 2016-2018, corresponding to an integrated luminosity of 138 fb$^{-1}$. Selected events contain at least one pseudoscalar boson decaying electromagnetically in the muon system and at least one hadronically decaying $\tau$ lepton. No significant excess of data events is observed compared to the background expectation. Upper limits are set at 95% confidence level on the vector-like lepton production cross section as a function of the VLL mass and the pseudoscalar boson mean proper decay length. The observed and expected exclusion ranges of the VLL mass extend up to 700 and 670 GeV, respectively, depending on the pseudoscalar boson lifetime.

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Alikhanyan National Laboratory Yerevan State University Institute of High Energy Physics TU Wien University of Antwerp Vrije Universiteit Brussel Ghent University Hospital Université Libre de Bruxelles UCLouvain Centro Brasileiro de Pesquisas Físicas Universidade do Estado do Rio de Janeiro Universidade Estadual de Campinas (UNICAMP)Universidade Federal do Rio Grande do Sul Universidade Federal do ABC Bulgarian Academy of Sciences Sofia University "St. Kliment Ohridski"University of Tarapacá Universidad Técnica Federico Santa María Beihang University Tsinghua University University of Chinese Academy of Sciences China Center of Advanced Science and Technology China Spallation Neutron Source Peking University South China Normal University University of Science and Technology of China Nanjing Normal University Henan Normal University University of Shanghai for Science and Technology University of Iowa Fudan University Institute of Modern Physics Zhejiang University Universidad de Antioquia University of Split Ruđer Bošković Institute University of Cyprus Charles University National Polytechnic School Universidad San Francisco de Quito Academy of Scientific Research and Technology Zewail City of Science and Technology Ain Shams University British University in Egypt Fayoum University National Institute of Chemical Physics and Biophysics University of Helsinki Helsinki Institute of Physics Lappeenranta-Lahti University of Technology Commissariat à l'Énergie Atomique et aux Énergies Alternatives Université Paris-Saclay CEA Paris-Saclay Institut de Recherche sur les Lois Fondamentales de l'Univers Purdue University West Lafayette Centre National de la Recherche Scientifique École Polytechnique Laboratoire Leprince-Ringuet Université de Haute-Alsace Institut Pluridisciplinaire Hubert Curien Université de Strasbourg Centre de Calcul de l’Institut National de Physique Nucléaire et de Physique des Particules Institute of Nuclear Physics of Lyon Institut de Physique des 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Wisconsin–Madison Academy of Sciences Republic of Uzbekistan

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Computational Physics and Python ApplicationsParticle physics theoretical and experimental studiesCosmology and Gravitation Theories

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