Observation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Z</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub><mml:mo stretchy="false">(</mml:mo><mml:mn>3900</mml:mn><mml:msup><mml:mrow><mml:mo stretchy="false">)</mml:mo></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><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 stretchy="false">→</mml:mo><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi></mml:mrow></mml:math>
F. De Mori, M. Albrecht(Thomas Jefferson National Accelerator Facility), J. V. Bennett, Y. B. Chen(Institute of High Energy Physics), G. Chen(Institute of High Energy Physics), H. L. Dai(Institute of High Energy Physics), H. Y. Chen(Institute of High Energy Physics), I. Boyko(Joint Institute for Nuclear Research), G. Cibinetto, X. Z. Cai(State Forestry and Grassland Administration), J. P. Dai(Yunnan University), Y. Ban(Peking University), H. S. Chen(Northwest University), A. Amoroso(University of Turin), X. Ai(Johannes Gutenberg University Mainz), Mingliang Chen(Institute of High Energy Physics), A. Dbeyssi, H. Cai(Wuhan University), M. Destefanis, D. Bettoni(Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara), J. M. Bian, Ö. Çakır(Ankara University), М. Н. Ачасов(Uppsala University), R. A. Briere(Carnegie Mellon University), X. R. Chen(Institute of High Energy Physics), S. J. Chen(Nanjing University), J. C. Chen(Institute of High Energy Physics), F. Bianchi(University of Turin), Xun Chen, J. Chang(Chinese Academy of Sciences), O. Albayrak, G. F. Cao(Institute of High Energy Physics), Z. Y. Deng, J. Z. Bai(Institute of High Energy Physics), M. Bertani(Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati), F. F. An, I. Denysenko, D. Dedovich(Joint Institute for Nuclear Research), X. Chu(Peking University), S. A. Çetin(Doğuş University), H. P. Cheng, A. Denig(Johannes Gutenberg University Mainz), G. Chelkov(Joint Institute for Nuclear Research), D. Ambrose, E. Boger, D. W. Bennett, R. Baldini Ferroli, A. Calcaterra(Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati), Q. An(University of Science and Technology of China)
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