Observation of <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:mi>η</mml:mi><mml:msub><mml:mrow><mml:mi>h</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math> at center-of-mass energies from 4.085 to 4.600 GeV
A. Denig(Johannes Gutenberg University Mainz), Ming Chen(Institute of High Energy Physics), N. Berger(Johannes Gutenberg University Mainz), A. Calcaterra(Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati), M. Albrecht(Thomas Jefferson National Accelerator Facility), J. V. Bennett, G. F. Cao(Institute of High Energy Physics), G. Chen(Institute of High Energy Physics), H. L. Dai(Institute of High Energy Physics), I. Boyko(Joint Institute for Nuclear Research), S. J. Chen(Nanjing University), G. Cibinetto, J. F. Chang(Inner Mongolia University), Y. Ban(Peking University), Y. B. Chen(Institute of High Energy Physics), J. Chai(University of Turin), H. S. Chen(Northwest University), A. Amoroso(University of Turin), A. Dbeyssi, H. Cai(Wuhan University), S. Chen(University of Chinese Academy of Sciences), D. Bettoni(Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara), Ö. Çakır(Ankara University), М. Н. Ачасов(Uppsala University), R. A. Briere(Carnegie Mellon University), X. R. Chen(Institute of High Energy Physics), X. Chen(Institute of High Energy Physics), J. C. Chen(Institute of High Energy Physics), J. P. Dai(Shanghai Jiao Tong University), F. Bianchi(University of Turin), O. Albayrak, D. W. Bennett(Indiana University Bloomington), M. Bertani(Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati), F. F. An, D. J. Ambrose, O. Bakina(Joint Institute for Nuclear Research), X. Chu(Peking University), S. A. Çetin(Doğuş University), J. M. Bian(University of Minnesota), Z. Y. Deng(Xidian University), D. Dedovich, G. Chelkov(Joint Institute for Nuclear Research), E. Boger, S. Ahmed(Johannes Gutenberg University Mainz), J. Z. Bai, R. Baldini Ferroli, X. C. Ai(Chinese Academy of Sciences), Q. An(University of Science and Technology of China)
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