Published October 9, 2025 | Version Published
Journal Article Open

Search for the Rare Decay 𝐷⁰ → 𝜇⁺⁢𝜇⁻ in Proton-Proton Collisions at √s = 13.6 TeV

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Abstract

A search for the rare decay 𝐷⁰ → 𝜇⁺⁢𝜇⁻ is reported using proton-proton collision events at √𝑠 =13.6  TeV collected by the CMS detector in 2022–2023, corresponding to an integrated luminosity of 64.5  fb¹. This is the first analysis to use a newly developed inclusive dimuon trigger, expanding the scope of the CMS flavor physics program. The search uses 𝐷⁰ mesons obtained from 𝐷*⁺ → 𝐷⁰⁢𝜋⁺ decays. No significant excess is observed. A limit on the branching fraction of ℬ⁡(𝐷⁰ → 𝜇⁺⁢𝜇⁻)<2.4×10 at 95% confidence level is set. This is the most stringent upper limit set on any flavor changing neutral current decay in the charm sector.

Copyright and License

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Acknowledgement

We congratulate our colleagues in the CERN accelerator departments for the excellent performance of the LHC and thank the technical and administrative staffs at CERN and at other CMS institutes for their contributions to the success of the CMS effort. In addition, we gratefully acknowledge the computing centres and personnel of the Worldwide LHC Computing Grid and other centres for delivering so effectively the computing infrastructure essential to our analyses. Finally, we acknowledge the enduring support for the construction and operation of the LHC, the CMS detector, and the supporting computing infrastructure provided by the following funding agencies: SC (Armenia), BMBWF and FWF (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, FAPERGS, and FAPESP (Brazil); MES and BNSF (Bulgaria); CERN; CAS, MoST, and NSFC (China); MINCIENCIAS (Colombia); MSES and CSF (Croatia); RIF (Cyprus); SENESCYT (Ecuador); ERC PRG, RVTT3 and MoER TK202 (Estonia); Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France); SRNSF (Georgia); BMBF, DFG, and HGF (Germany); GSRI (Greece); NKFIH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); MSIP and NRF (Republic of Korea); MES (Latvia); LMTLT (Lithuania); MOE and UM (Malaysia); BUAP, CINVESTAV, CONACYT, LNS, SEP, and UASLP-FAI (Mexico); MOS (Montenegro); MBIE (New Zealand); PAEC (Pakistan); MES and NSC (Poland); FCT (Portugal); JINR (Dubna); MON, RosAtom, RAS, RFBR, and NRC KI (Russia); MESTD (Serbia); MICIU/AEI and PCTI (Spain); MOSTR (Sri Lanka); Swiss Funding Agencies (Switzerland); MST (Taipei); MHESI and NSTDA (Thailand); TUBITAK and TENMAK (Turkey); NASU (Ukraine); STFC (United Kingdom); DOE and NSF (USA).

Data Availability

Release and preservation of data used by the CMS Collaboration as the basis for publications is guided by the CMS data preservation, re-use and open access policy [37].

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Additional details

Related works

Is new version of
Discussion Paper: arXiv:2506.06152 (arXiv)
Is supplemented by
Dataset: 10.7483/OPENDATA.CMS.1BNU.8V1W (DOI)

Funding

Federal Ministry for Education and Women
FWF Austrian Science Fund
Fund for Scientific Research
Research Foundation - Flanders
National Council for Scientific and Technological Development
Coordenação de Aperfeicoamento de Pessoal de Nível Superior
Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul
Fundação de Amparo à Pesquisa do Estado de São Paulo
Ministry of Education and Science
Bulgarian Science Fund
European Organization for Nuclear Research
Chinese Academy of Sciences
Ministry of Science and Technology of the People's Republic of China
National Natural Science Foundation of China
Ministry of Science, Education and Sports
Croatian Science Foundation
Secretaría de Educación Superior, Ciencia, Tecnología e Innovación
European Research Council
Research Council of Finland
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
Centre National de la Recherche Scientifique
Institut National de Physique Nucléaire et de Physique des Particules
Shota Rustaveli National Science Foundation
Federal Ministry of Education, Science and Research
Deutsche Forschungsgemeinschaft
Helmholtz Association of German Research Centres
National Research, Development and Innovation Office
Department of Atomic Energy
Department of Science and Technology
Institute for Research in Fundamental Sciences
Science Foundation Ireland
Istituto Nazionale di Fisica Nucleare
Ministry of Science, ICT and Future Planning
National Research Foundation of Korea
Ministry of Education and Science
Ministry of Education
University of Malaya
Benemérita Universidad Autónoma de Puebla
Instituto Politécnico Nacional
Consejo Nacional de Humanidades, Ciencias y Tecnologías
Laboratorio Nacional de Supercómputo del Sureste de Mexico
Secretariat of Public Education
Autonomous University of San Luis Potosí
Ministry of Business, Innovation and Employment
Pakistan Atomic Energy Commission
National Science Center
Fundação para a Ciência e Tecnologia
Joint Institute for Nuclear Research
The Ministry of Education and Science of the Russian Federation
Rosatom (Russia)
Siberian Branch of the Russian Academy of Sciences
Russian Foundation for Basic Research
Petersburg Nuclear Physics Institute
Ministry of Education, Science and Technological Development
Ministerio de Ciencia, Innovación y Universidades
Agencia Estatal de Investigación
Ministry of Science, Technology and Research
Thailand Science Research and Innovation
National Science and Technology Development Agency
Scientific and Technological Research Council of Turkey
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National Academy of Sciences of Ukraine
Science and Technology Facilities Council
United States Department of Energy
National Science Foundation
UCLouvain
Universidade do Estado do Rio de Janeiro
Institute of High Energy Physics
National Institute of Chemical Physics and Biophysics
Deutsches Elektronen-Synchrotron DESY
Karlsruhe Institute of Technology
RWTH Aachen University
University of Ioannina
Wigner Research Centre for Physics
Tata Institute of Fundamental Research
Kyungpook National University
Quaid-i-Azam University
Korea Institute of Science & Technology Information
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
Instituto de Física de Cantabria
CSCS - Swiss National Supercomputing Centre
Middle East Technical University
Brunel University London
Imperial College London
Queen Mary University of London
Royal Holloway University of London
Rutherford Appleton Laboratory
University of Bristol
University of Glasgow
University of Oxford
Baylor University
California Institute of Technology
Fermi National Accelerator Laboratory
Massachusetts Institute of Technology
National Energy Research Scientific Computing Center
Purdue University West Lafayette
San Diego Supercomputer Center
University of California, San Diego
University of Colorado Boulder
University of Florida
University of Nebraska–Lincoln
University of Wisconsin–Madison
Vanderbilt University
SC, Armenia
MINCIENCIAS, Colombia
RIF, Cyprus
RVTT3
MoER TK202
MEC, Finland
HIP, Finland
GSRI, Greece
LMTLT, Lithuania
MOS, Montenegro
MES, Poland
PCTI, Spain
Swiss Funding Agencies
MST, Taipei
Institut für Hochenergiephysik (HEPHY) using the Cloud Infrastructure Platform (CLIP), Vienna
Inter-University Institute for High Energies
São Paulo Research and Analysis Center, São Paulo
Helsinki Institute of Physics
Grille de Recherche d'Ile de France
Institut de recherche sur les lois fondamentales de l'Univers, CEA, Université Paris-Saclay
Institut Pluridisciplinaire Hubert Curien
Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris
INFN CNAF, Bologna
INFN Sezione di Bari, Università di Bari, Politecnico di Bari, Bari
INFN Sezione di Pisa, Università di Pisa, Scuola Normale Superiore di Pisa, Pisa
INFN Sezione di Roma, Sapienza Università di Roma, Rome
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Laboratori Nazionali di Legnaro
Akademickie Centrum Komputerowe Cyfronet AGH, Krakow
National Centre for Nuclear Research
Laboratório de Instrumentação e Física Experimental de Partículas
Institute for High Energy Physics of National Research Centre 'Kurchatov Institute'
A.I. Alikhanov of NRC "Kurchatov Institute"
Port d'Informació Científica
Instrumentation and Detector Consortium, Taipei
National Center for High-performance Computing
National Scientific Center, Kharkov Institute of Physics and Technology
Open Science Grid (OSG) Consortium
Pittsburgh Supercomputing Center
Texas Advanced Computing Center
SCOAP3

Dates

Accepted
2025-08-29

Caltech Custom Metadata

Caltech groups
CMS@Caltech, Division of Physics, Mathematics and Astronomy (PMA)
Publication Status
Published