Measurement of the phase between strong and electromagnetic amplitudes in the decay J/ψ → ϕη

Ablikim, M.; Achasov, M. N.; Adlarson, P.; Afedulidis, O.; Ai, X. C.; Aliberti, R.; Amoroso, A.; Bai, Y.; Bakina, O.; Balossino, I.; Ban, Y.; Bao, H.-R.; Batozskaya, V.; Begzsuren, K.; Berger, N.; Berlowski, M.; Bertani, M.; Bettoni, D.; Bianchi, F.; Bianco, E.; Bortone, A.; Boyko, I.; Briere, R. A.; Brueggemann, A.; Cai, H.; Cai, X.; Calcaterra, A.; Cao, G. F.; Cao, N.; Cetin, S. A.; Chai, X. Y.; Chang, J. F.; Che, G. R.; Che, Y. Z.; Chelkov, G.; Chen, C.; Chen, C. H.; Chen, Chao; Chen, G.; Chen, H. S.; Chen, H. Y.; Chen, M. L.; Chen, S. J.; Chen, S. L.; Chen, S. M.; Chen, T.; Chen, X. R.; Chen, X. T.; Chen, Y. B.; Chen, Y. Q.; Chen, Z. J.; Chen, Z. Y.; Choi, S. K.; Cibinetto, G.; Cossio, F.; Cui, J. J.; Dai, H. L.; Dai, J. P.; Dbeyssi, A.; de Boer, R. E.; Dedovich, D.; Deng, C. Q.; Deng, Z. Y.; Denig, A.; Denysenko, I.; Destefanis, M.; De Mori, F.; Ding, B.; Ding, X. X.; Ding, Y.; Ding, Y.; Dong, J.; Dong, L. Y.; Dong, M. Y.; Dong, X.; Du, M. C.; Du, S. X.; Duan, Y. Y.; Duan, Z. 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doi:10.1007/JHEP11(2025)077

Title: Measurement of the phase between strong and electromagnetic amplitudes in the decay J/ψ → ϕη

Journal Article · Thu Nov 13 00:00:00 UTC 2025 · Journal of High Energy Physics (Online)

DOI: https://doi.org/10.1007/JHEP11(2025)077 · OSTI ID:3008630

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Institute of High Energy Physics
Budker Institute of Nuclear Physics SB RAS (BINP); Novosibirsk State University
Uppsala University
Bochum Ruhr-University
Zhengzhou University
Johannes Gutenberg University of Mainz
University of Turin; INFN
Southeast University
Joint Institute for Nuclear Research
INFN Sezione di Ferrara
Peking University; Peking University
University of Chinese Academy of Sciences
Institute of High Energy Physics; National Centre for Nuclear Research
Institute of Physics and Technology
National Centre for Nuclear Research
INFN Laboratori Nazionali di Frascati
Carnegie Mellon University
University of Muenster
Wuhan University
Institute of High Energy Physics; State Key Laboratory of Particle Detection and Electronics
Institute of High Energy Physics; University of Chinese Academy of Sciences
Turkish Accelerator Center Particle Factory Group, Istinye University
Nankai University
Institute of High Energy Physics; State Key Laboratory of Particle Detection and Electronics; University of Chinese Academy of Sciences
Joint Institute for Nuclear Research; Moscow Institute of Physics and Technology
China University of Geosciences
Soochow University
Henan University
Nanjing University
North China Electric Power University
Tsinghua University
Institute of Modern Physics; University of Chinese Academy of Sciences
Jilin University
Hunan University; Hunan University
Chung-Ang University
INFN
Shandong University
Yunnan University
Helmholtz Institute Mainz
University of South China
Institute of High Energy Physics; University of Jinan
Liaoning University
Sun Yat-Sen University
University of Eastern Piedmont; INFN
State Key Laboratory of Particle Detection and Electronics; University of Science and Technology of China
Nanjing Normal University
INFN Sezione di Ferrara; University of Ferrara
Henan Normal University
University of Manchester
University of Oxford
GSI Helmholtzcentre for Heavy Ion Research GmbH
Guangxi University
Shandong Normal University
Fudan University; Fudan University
Indiana University
University of Hawaii
Suranaree University of Technology
South China Normal University; South China Normal University
University of the Punjab
Liaoning Normal University
Hangzhou Normal University
Huangshan College
University of Jinan
Universidad de Tarapacá
University of Groningen
Indian Institute of Technology Madras
National Centre for Nuclear Research; Uppsala University
Justus-Liebig-Universitaet Giessen, II. Physikalisches Institut
Qufu Normal University
Renmin University of China
Lanzhou University; Lanzhou University; Lanzhou University
Hebei University; Institute of Modern Physics
Fudan University
Institute of High Energy Physics; China Center of Advanced Science and Technology
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
Institute of Modern Physics
GSI Helmholtzcentre for Heavy Ion Research GmbH; University of Groningen
Helmholtz Institute Mainz; Goethe University Frankfurt
COMSATS University Islamabad, Lahore Campus; IBA
Chung-Ang University; University of Chinese Academy of Sciences
INFN Sezione di Perugia; University of Perugia
GSI Helmholtzcentre for Heavy Ion Research GmbH; Goethe University Frankfurt
Joint Institute for Nuclear Research; NRC “Kurchatov Institute”, PNPI
Hunan Normal University
Institute of High Energy Physics; Jilin University
Peking University; Peking University; Ecole Polytechnique Federale de Lausanne (EPFL)
Shanghai Jiao Tong University; Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education; Shanghai Key Laboratory for Particle Physics and Cosmology; Institute of Nuclear and Particle Physics
Near East University, Nicosia, North Cyprus
Helmholtz Institute Mainz; Johannes Gutenberg University of Mainz; State Key Laboratory of Particle Detection and Electronics; University of Science and Technology of China
Hebei University
Beihang University; University of Jinan
Inner Mongolia University
Yantai University
China Center of Advanced Science and Technology
Beihang University
University of Bristol, H H Wills Physics Laboratory
Shanxi Normal University
University of Science and Technology Liaoning

The first direct measurement of the relative phase between the strong and electromagnetic amplitudes for a J/ψ decaying into a vector-pseudoscalar final state is performed using 26 energy points of e⁺e⁻ annihilation data between 3.00 GeV and 3.12 GeV. The data sets were collected by the BESIII detector with a total integrated luminosity of 452 pb⁻¹. By investigating the interference pattern in the cross section lineshape of e⁺e⁻ → ϕη, the relative phase between the strong and electromagnetic amplitudes of J/ψ decay is determined to be within [133°, 228°] at 68% confidence level.

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Research Organization:: Univ. of Oregon, Eugene, OR (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: FG02-05ER41374; SC0011640

OSTI ID:: 3008630

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 11 Vol. 2025; ISSN 1029-8479

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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