Search for the charged lepton flavor violating decay ψ(3686)→e±μ∓

BESIII Collaboration

doi:10.1007/s11433-025-2901-7

Search for the charged lepton flavor violating decay ψ(3686)→e^±μ^∓

BESIII Collaboration

Instituto de Alta Investigación

CAS - Institute of High Energy Physics
Budker Institute of Nuclear Physics of the Siberian Branch of the RAS
Novosibirsk State University
Uppsala University
Zhengzhou University
Chinese Academy of Sciences
Johannes Gutenberg University Mainz
University of Turin
National Institute for Nuclear Physics
University of Science and Technology of China
Southeast University, Nanjing
Joint Institute for Nuclear Research
Peking University
University of Chinese Academy of Sciences
National Centre for Nuclear Research
Mongolian Academy of Sciences
Carnegie Mellon University
University of Münster
Wuhan University
Lanzhou University
Istinye University
Nankai University
China University of Geosciences, Wuhan
Soochow University
Henan University
Nanjing University
North China Electric Power University
Tsinghua University
CAS - Institute of Modern Physics
Fudan University
Guangxi University of Technology
Jilin University
Hunan Normal University
Hunan University
Sun Yat-Sen University
Chung-Ang University
University of Bristol
Shandong University
Yunnan University
Helmholtz Institute Mainz
Ruhr University Bochum
University of South China
University of Jinan
Liaoning University
Inner Mongolia University
Moscow Institute of Physics and Technology
Henan Normal University
University of Eastern Piedmont
Nanjing Normal University
University of Ferrara
University of Manchester
University of Oxford
GSI Helmholtz Centre for Heavy Ion Research
Guangxi University
Shandong Normal University
Indiana University Bloomington
University of Hawai'i at Mānoa
Suranaree University of Technology
South China Normal University
University of the Punjab
Hangzhou Normal University
Huangshan College
University of Groningen
Indian Institute of Technology Madras
Justus Liebig University Giessen
Qufu Normal University
Liaoning Normal University
Renmin University of China
Hebei University
China Center of Advanced Science and Technology World Laboratory
Sichuan University
Guangxi Normal University
Shanxi University
Central China Normal University
Henan University of Science and Technology
Henan University of Technology
Central South University
Zhejiang University
Goethe University Frankfurt
COMSATS University Islamabad
Institute of Business Administration Karachi
University of Perugia
Petersburg Nuclear Physics Institute (PNPI)
Swiss Federal Institute of Technology Lausanne
Shanghai Jiao Tong University
Ministry of Education of the People's Republic of China
Near East University
Beihang University
Yantai University
Shanxi Normal University
University of Science and Technology Liaoning

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Resumen

By analyzing (2367.0 ± 11.1) × 10⁶ ψ(3686) events collected in e⁺e⁻ collisions at s=3.686GeV with the BESIII detector at the BEPCII collider, we report the first search for the charged lepton flavor violating decay ψ(3686) → e^±μ^∓. No signal is observed. An upper limit on the branching fraction B(ψ(3686)→e±μ∓) is determined to be 1.4 × 10⁻⁸ at the 90% confidence level.

Idioma original	Inglés
Número de artículo	251012
Publicación	Science China: Physics, Mechanics and Astronomy
Volumen	69
N.º	5
DOI	https://doi.org/10.1007/s11433-025-2901-7
Estado	Publicada - may 2026

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10.1007/s11433-025-2901-7

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title = "Search for the charged lepton flavor violating decay ψ(3686)→e±μ∓",

abstract = "By analyzing (2367.0 ± 11.1) × 106 ψ(3686) events collected in e+e− collisions at s=3.686GeV with the BESIII detector at the BEPCII collider, we report the first search for the charged lepton flavor violating decay ψ(3686) → e±μ∓. No signal is observed. An upper limit on the branching fraction B(ψ(3686)→e±μ∓) is determined to be 1.4 × 10−8 at the 90\% confidence level.",

keywords = "BESIII, charmonium, ee experiments, lepton flavor violating decay",

author = "M. Ablikim and Achasov, \{M. N.\} and P. Adlarson and Ai, \{X. C.\} and S. Kabana and \{The BESIII collaboration\}",

note = "Publisher Copyright: {\textcopyright} Science China Press 2026.",

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doi = "10.1007/s11433-025-2901-7",

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journal = "Science China: Physics, Mechanics and Astronomy",

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AU - Achasov, M. N.

AU - Adlarson, P.

AU - Ai, X. C.

AU - Kabana, S.

AU - The BESIII collaboration

N1 - Publisher Copyright: © Science China Press 2026.

PY - 2026/5

Y1 - 2026/5

N2 - By analyzing (2367.0 ± 11.1) × 106 ψ(3686) events collected in e+e− collisions at s=3.686GeV with the BESIII detector at the BEPCII collider, we report the first search for the charged lepton flavor violating decay ψ(3686) → e±μ∓. No signal is observed. An upper limit on the branching fraction B(ψ(3686)→e±μ∓) is determined to be 1.4 × 10−8 at the 90% confidence level.

AB - By analyzing (2367.0 ± 11.1) × 106 ψ(3686) events collected in e+e− collisions at s=3.686GeV with the BESIII detector at the BEPCII collider, we report the first search for the charged lepton flavor violating decay ψ(3686) → e±μ∓. No signal is observed. An upper limit on the branching fraction B(ψ(3686)→e±μ∓) is determined to be 1.4 × 10−8 at the 90% confidence level.

KW - BESIII

KW - charmonium

KW - ee experiments

KW - lepton flavor violating decay

UR - https://www.scopus.com/pages/publications/105038084868

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DO - 10.1007/s11433-025-2901-7

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SN - 1674-7348

VL - 69

JO - Science China: Physics, Mechanics and Astronomy

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