Search for the lepton number violating process J/ψ→K+K+e−e−+c.c.

The BESIII collaboration

doi:10.1088/1674-1137/ae0f86

Search for the lepton number violating process J/ψ→K⁺K⁺e⁻e⁻+c.c.

The BESIII collaboration

Institute of Higher Research

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
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
National Institute for Nuclear Physics
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
Hunan Normal University
Sun Yat-Sen University
Chung-Ang University
University of Bristol
Yunnan University
Helmholtz Institute Mainz
Ruhr University Bochum
University of South China
University of Jinan
Jilin University
Liaoning University
Inner Mongolia University
Moscow Institute of Physics and Technology
Henan Normal University
Nanjing Normal University
University of Ferrara
University of Manchester
University of Oxford
GSI Helmholtz Centre for Heavy Ion Research
Guangxi University
Shandong 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
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
Hunan University
Goethe University Frankfurt
COMSATS University Islamabad
IBA
University of Perugia
Petersburg Nuclear Physics Institute (PNPI)
Hangzhou Normal University
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
Hengyang Normal University
Shanxi Normal University
University of Science and Technology Liaoning

Research output: Contribution to journal › Article › peer-review

Abstract

Based on (10087 ± 44) × 10⁶ J/ψ events collected with the BESIII detector, we search for the lepton number violating decay J/ψ → K⁺K⁺e⁻e⁻ + c.c. for the first time. The upper limit on the branching fraction of this decay is set to 2.1 × 10⁻⁹ at the 90% confidence level with a frequentist method. This is the first search for J/ψ decays with a lepton number change by two, offering valuable insights into the underlying physical processes.

Original language	English
Article number	013107
Journal	Chinese Physics C
Volume	50
Issue number	1
DOIs	https://doi.org/10.1088/1674-1137/ae0f86
State	Published - 1 Jan 2026

Keywords

Lepton number violation
matter anti-matter asymmetry
neutrinoless double beta decay

Access to Document

10.1088/1674-1137/ae0f86

Cite this

@article{1f4b90c51f3346b9a843f2aa1f1e6282,

title = "Search for the lepton number violating process J/ψ→K+K+e−e−+c.c.",

abstract = "Based on (10087 ± 44) × 106 J/ψ events collected with the BESIII detector, we search for the lepton number violating decay J/ψ → K+K+e−e− + c.c. for the first time. The upper limit on the branching fraction of this decay is set to 2.1 × 10−9 at the 90\% confidence level with a frequentist method. This is the first search for J/ψ decays with a lepton number change by two, offering valuable insights into the underlying physical processes.",

keywords = "Lepton number violation, matter anti-matter asymmetry, neutrinoless double beta decay",

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

year = "2026",

month = jan,

day = "1",

doi = "10.1088/1674-1137/ae0f86",

language = "English",

volume = "50",

journal = "Chinese Physics C",

issn = "1674-1137",

number = "1",

}

TY - JOUR

T1 - Search for the lepton number violating process J/ψ→K+K+e−e−+c.c.

AU - Ablikim, M.

AU - Achasov, M. N.

AU - Adlarson, P.

AU - Ai, X. C.

AU - Kabana, S.

AU - The BESIII collaboration

PY - 2026/1/1

Y1 - 2026/1/1

N2 - Based on (10087 ± 44) × 106 J/ψ events collected with the BESIII detector, we search for the lepton number violating decay J/ψ → K+K+e−e− + c.c. for the first time. The upper limit on the branching fraction of this decay is set to 2.1 × 10−9 at the 90% confidence level with a frequentist method. This is the first search for J/ψ decays with a lepton number change by two, offering valuable insights into the underlying physical processes.

AB - Based on (10087 ± 44) × 106 J/ψ events collected with the BESIII detector, we search for the lepton number violating decay J/ψ → K+K+e−e− + c.c. for the first time. The upper limit on the branching fraction of this decay is set to 2.1 × 10−9 at the 90% confidence level with a frequentist method. This is the first search for J/ψ decays with a lepton number change by two, offering valuable insights into the underlying physical processes.

KW - Lepton number violation

KW - matter anti-matter asymmetry

KW - neutrinoless double beta decay

UR - https://www.scopus.com/pages/publications/105035171443

U2 - 10.1088/1674-1137/ae0f86

DO - 10.1088/1674-1137/ae0f86

M3 - Article

AN - SCOPUS:105035171443

SN - 1674-1137

VL - 50

JO - Chinese Physics C

JF - Chinese Physics C

IS - 1

M1 - 013107

ER -

Search for the lepton number violating process J/ψ→K⁺K⁺e⁻e⁻+c.c.

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this