Search for the lepton number violating decay <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:mi>η</mml:mi> <mml:mo stretchy="false">→</mml:mo> <mml:msup> <mml:mrow> <mml:mi>π</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> </mml:mrow> </mml:msup> <mml:msup> <mml:mrow> <mml:mi>π</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> </mml:mrow> </mml:msup> <mml:msup> <mml:mrow> <mml:mi>e</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>−</mml:mo> </mml:mrow> </mml:msup> <mml:msup> <mml:mrow> <mml:mi>e</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>−</mml:mo> </mml:mrow> </mml:msup> <mml:mo>+</mml:mo> <mml:mi mathvariant="normal">c</mml:mi> <mml:mo>.</mml:mo> <mml:mi mathvariant="normal">c</mml:mi> <mml:mo>.</mml:mo> </mml:mrow> </mml:math> via <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mi>J</mml:mi> <mml:mo>/</mml:mo> <mml:mi>ψ</mml:mi> <mml:mo stretchy="false">→</mml:mo> <mml:mi>ϕ</mml:mi> <mml:mi>η</mml:mi> </mml:math>
Year: 2025
Type: article
Language: en
Topic: Particle physics theoretical and experimental studies
Authors and affiliations:
raw_author_name: M. Ablikim
raw_affiliation_strings: Institute of High Energy Physics
raw_author_name: M. N. Achasov
raw_affiliation_strings: Budker Institute of Nuclear Physics SB RAS (BINP)
raw_author_name: P. Adlarson
raw_affiliation_strings: Uppsala University
raw_author_name: X. C. Ai
raw_affiliation_strings: Zhengzhou University
raw_author_name: R. Aliberti
raw_affiliation_strings: Johannes Gutenberg University of Mainz
raw_author_name: A. Amoroso
raw_affiliation_strings: INFN
University of Turin
raw_author_name: Q. An
raw_affiliation_strings: State Key Laboratory of Particle Detection and Electronics
University of Science and Technology of China
raw_author_name: Y. Bai
raw_affiliation_strings: Southeast University
raw_author_name: O. Bakina
raw_affiliation_strings: Joint Institute for Nuclear Research
raw_author_name: Y. Ban
raw_affiliation_strings: Peking University
raw_author_name: H.-R. Bao
raw_affiliation_strings: University of Chinese Academy of Sciences
raw_author_name: V. Batozskaya
raw_affiliation_strings: Institute of High Energy Physics
National Centre for Nuclear Research
raw_author_name: K. Begzsuren
raw_affiliation_strings: Mongolian Academy of Sciences
raw_author_name: N. Berger
raw_affiliation_strings: Johannes Gutenberg University of Mainz
raw_author_name: M. Berlowski
raw_affiliation_strings: National Centre for Nuclear Research
raw_author_name: M. Bertani
raw_affiliation_strings: INFN Laboratori Nazionali di Frascati
raw_author_name: D. Bettoni
raw_affiliation_strings: INFN Sezione di Ferrara
raw_author_name: F. Bianchi
raw_affiliation_strings: INFN
University of Turin
raw_author_name: E. Bianco
raw_affiliation_strings: INFN
University of Turin
raw_author_name: A. Bortone
raw_affiliation_strings: INFN
University of Turin
raw_author_name: I. Boyko
raw_affiliation_strings: Joint Institute for Nuclear Research
raw_author_name: R. A. Briere
raw_affiliation_strings: Carnegie Mellon University
raw_author_name: A. Brueggemann
raw_affiliation_strings: University of Muenster
raw_author_name: H. Cai
raw_affiliation_strings: Wuhan University
raw_author_name: M. H. Cai
raw_affiliation_strings: Lanzhou University
raw_author_name: X. Cai
raw_affiliation_strings: Institute of High Energy Physics
State Key Laboratory of Particle Detection and Electronics
raw_author_name: A. Calcaterra
raw_affiliation_strings: INFN Laboratori Nazionali di Frascati
raw_author_name: G. F. Cao
raw_affiliation_strings: Institute of High Energy Physics
University of Chinese Academy of Sciences
raw_author_name: N. Cao
raw_affiliation_strings: Institute of High Energy Physics
University of Chinese Academy of Sciences
raw_author_name: S. A. Cetin
raw_affiliation_strings: Istinye University
raw_author_name: X. Y. Chai
raw_affiliation_strings: Peking University
raw_author_name: J. F. Chang
raw_affiliation_strings: Institute of High Energy Physics
State Key Laboratory of Particle Detection and Electronics
raw_author_name: G. R. Che
raw_affiliation_strings: Nankai University
raw_author_name: Y. Z. Che
raw_affiliation_strings: Institute of High Energy Physics
State Key Laboratory of Particle Detection and Electronics
University of Chinese Academy of Sciences
raw_author_name: C. H. Chen
raw_affiliation_strings: China University of Geosciences
Soochow University
raw_author_name: Chao Chen
raw_affiliation_strings: China University of Geosciences
Soochow University
raw_author_name: G. Chen
raw_affiliation_strings: Institute of High Energy Physics
raw_author_name: H. S. Chen
raw_affiliation_strings: Henan University
Institute of High Energy Physics
University of Chinese Academy of Sciences
raw_author_name: H. Y. Chen
raw_affiliation_strings: Henan University
Institute of High Energy Physics
University of Chinese Academy of Sciences
raw_author_name: M. L. Chen
raw_affiliation_strings: Institute of High Energy Physics
State Key Laboratory of Particle Detection and Electronics
University of Chinese Academy of Sciences
raw_author_name: S. J. Chen
raw_affiliation_strings: Nanjing University
North China Electric Power University
Tsinghua University
raw_author_name: S. L. Chen
raw_affiliation_strings: Nanjing University
North China Electric Power University
Tsinghua University
raw_author_name: S. M. Chen
raw_affiliation_strings: Nanjing University
North China Electric Power University
Tsinghua University
raw_author_name: T. Chen
raw_affiliation_strings: Institute of High Energy Physics
University of Chinese Academy of Sciences
raw_author_name: X. R. Chen
raw_affiliation_strings: Fudan University
Institute of High Energy Physics
Institute of Modern Physics
University of Chinese Academy of Sciences
raw_author_name: X. T. Chen
raw_affiliation_strings: Fudan University
Institute of High Energy Physics
Institute of Modern Physics
University of Chinese Academy of Sciences
raw_author_name: X. Y. Chen
raw_affiliation_strings: Fudan University
Institute of High Energy Physics
Institute of Modern Physics
University of Chinese Academy of Sciences
raw_author_name: Y. B. Chen
raw_affiliation_strings: Guangxi University of Science and Technology
Institute of High Energy Physics
Jilin University
State Key Laboratory of Particle Detection and Electronics
raw_author_name: Y. Q. Chen
raw_affiliation_strings: Guangxi University of Science and Technology
Institute of High Energy Physics
Jilin University
State Key Laboratory of Particle Detection and Electronics
raw_author_name: Y. Q. Chen
raw_affiliation_strings: Guangxi University of Science and Technology
Institute of High Energy Physics
Jilin University
State Key Laboratory of Particle Detection and Electronics
raw_author_name: Z. J. Chen
raw_affiliation_strings: Hunan University
Sun Yat-Sen University
raw_author_name: Z. K. Chen
raw_affiliation_strings: Hunan University
Sun Yat-Sen University
raw_author_name: S. K. Choi
raw_affiliation_strings: Chung-Ang University
raw_author_name: X. Chu
raw_affiliation_strings: Fudan University
raw_author_name: G. Cibinetto
raw_affiliation_strings: INFN Sezione di Ferrara
raw_author_name: F. Cossio
raw_affiliation_strings: INFN
raw_author_name: J. Cottee-Meldrum
raw_affiliation_strings: University of Bristol
raw_author_name: J. J. Cui
raw_affiliation_strings: Shandong University
raw_author_name: H. L. Dai
raw_affiliation_strings: Institute of High Energy Physics
State Key Laboratory of Particle Detection and Electronics
raw_author_name: J. P. Dai
raw_affiliation_strings: Yunnan University
raw_author_name: A. Dbeyssi
raw_affiliation_strings: Helmholtz Institute Mainz
raw_author_name: R. E. de Boer
raw_affiliation_strings: Bochum Ruhr-University
raw_author_name: D. Dedovich
raw_affiliation_strings: Joint Institute for Nuclear Research
raw_author_name: C. Q. Deng
raw_affiliation_strings: University of South China
raw_author_name: Z. Y. Deng
raw_affiliation_strings: Institute of High Energy Physics
raw_author_name: A. Denig
raw_affiliation_strings: Johannes Gutenberg University of Mainz
raw_author_name: I. Denysenko
raw_affiliation_strings: Joint Institute for Nuclear Research
raw_author_name: M. Destefanis
raw_affiliation_strings: INFN
University of Turin
raw_author_name: F. De Mori
raw_affiliation_strings: INFN
University of Turin
raw_author_name: B. Ding
raw_affiliation_strings: Institute of High Energy Physics
University of Jinan
raw_author_name: X. X. Ding
raw_affiliation_strings: Peking University
raw_author_name: Y. Ding
raw_affiliation_strings: Inner Mongolia University
Jilin University
Liaoning University
raw_author_name: Y. Ding
raw_affiliation_strings: Inner Mongolia University
Jilin University
Liaoning University
raw_author_name: Y. X. Ding
raw_affiliation_strings: Inner Mongolia University
Jilin University
Liaoning University
raw_author_name: J. Dong
raw_affiliation_strings: Institute of High Energy Physics
State Key Laboratory of Particle Detection and Electronics
raw_author_name: L. Y. Dong
raw_affiliation_strings: Institute of High Energy Physics
University of Chinese Academy of Sciences
raw_author_name: M. Y. Dong
raw_affiliation_strings: Institute of High Energy Physics
State Key Laboratory of Particle Detection and Electronics
University of Chinese Academy of Sciences
raw_author_name: X. Dong
raw_affiliation_strings: Wuhan University
raw_author_name: M. C. Du
raw_affiliation_strings: Institute of High Energy Physics
raw_author_name: S. X. Du
raw_affiliation_strings: Fudan University
Zhengzhou University
raw_author_name: S. X. Du
raw_affiliation_strings: Fudan University
Zhengzhou University
raw_author_name: Y. Y. Duan
raw_affiliation_strings: Soochow University
raw_author_name: P. Egorov
raw_affiliation_strings: Joint Institute for Nuclear Research
raw_author_name: G. F. Fan
raw_affiliation_strings: Nanjing University
raw_author_name: J. J. Fan
raw_affiliation_strings: Henan Normal University
raw_author_name: Y. H. Fan
raw_affiliation_strings: North China Electric Power University
raw_author_name: J. Fang
raw_affiliation_strings: Institute of High Energy Physics
State Key Laboratory of Particle Detection and Electronics
Sun Yat-Sen University
raw_author_name: J. Fang
raw_affiliation_strings: Institute of High Energy Physics
State Key Laboratory of Particle Detection and Electronics
Sun Yat-Sen University
raw_author_name: S. S. Fang
raw_affiliation_strings: Institute of High Energy Physics
University of Chinese Academy of Sciences
raw_author_name: W. X. Fang
raw_affiliation_strings: Institute of High Energy Physics
raw_author_name: Y. Q. Fang
raw_affiliation_strings: Institute of High Energy Physics
State Key Laboratory of Particle Detection and Electronics
raw_author_name: R. Farinelli
raw_affiliation_strings: INFN Sezione di Ferrara
raw_author_name: L. Fava
raw_affiliation_strings: INFN
University of Eastern Piedmont
raw_author_name: F. Feldbauer
raw_affiliation_strings: Bochum Ruhr-University
raw_author_name: G. Felici
raw_affiliation_strings: INFN Laboratori Nazionali di Frascati
raw_author_name: C. Q. Feng
raw_affiliation_strings: State Key Laboratory of Particle Detection and Electronics
University of Science and Technology of China
raw_author_name: J. H. Feng
raw_affiliation_strings: Guangxi University of Science and Technology
raw_author_name: L. Feng
raw_affiliation_strings: Lanzhou University
raw_author_name: Q. X. Feng
raw_affiliation_strings: Lanzhou University
raw_author_name: Y. T. Feng
raw_affiliation_strings: State Key Laboratory of Particle Detection and Electronics
University of Science and Technology of China