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    Yin, J. H.; Li, Y. B.; Asner, D. M.; Aushev, T.; Behera, P.; Bessner, M.; Biswas, D.; Bodrov, D.; Bonvicini, G.; Bozek, A.; Bračko, M.; Budano, A.; Chang, M.-C.; Chilikin, K.; Cho, K.; Choi, S.-K.; Cinabro, D.; Cochran, J.; Das, S.; De Nardo, G.; De Pietro, G.; Dhamija, R.; Dingfelder, J.; Dong, T. V.; Epifanov, D.; Ferlewicz, D.; Giri, A.; Goldenzweig, P.; Graziani, E.; Gudkova, K.; Hadjivasiliou, C.; Hayashii, H.; Ishikawa, A.; Itoh, R.; Iwasaki, M.; Ji, Q. P.; Jia, S.; Jin, Y.; Kahn, J.; Kiesling, C.; Kim, C. H.; Kim, D. Y.; Kinoshita, K.; Kodyš, P.; Korpar, S.; Krokovny, P.; Kuhr, T.; Kumar, R.; Kumara, K.; Lam, T.; Lange, J. S.; Lee, S. C.; Libby, J.; Lieret, K.; Lin, Y.-R.; Liventsev, D.; Masuda, M.; Matvienko, D.; Merola, M.; Mussa, R.; Narwal, D.; Natkaniec, Z.; Natochii, A.; Nayak, L.; Nayak, M.; Ono, H.; Pardi, S.; Park, H.; Park, J.; Patra, S.; Paul, S.; Pestotnik, R.; Podobnik, T.; Prencipe, E.; Rout, N.; Sangal, A.; Santelj, L.; Savinov, V.; Schnell, G.; Schwanda, C.; Senyo, K.; Shapkin, M.; Solovieva, E.; Starič, M.; Sumihama, M.; Tanida, K.; Tenchini, F.; Uchida, M.; Usov, Y.; Vahsen, S. E.; Varner, G.; Wang, D.; Werbycka, O.; Yan, W.; Yang, S. B.; Yelton, J.; Yuan, C. Z.; Zhang, Z. P.; Zhilich, V.; Zhukova, V.

    The journal of high energy physics, 08/2023, Volume: 2023, Issue: 8
    Journal Article

    A bstract We measure the cross section of e + e − → η c J/ψ at the Υ( nS )( n = 1–5) on-resonance and 10.52 GeV off-resonance energy points using the full data sample collected by the Belle detector with an integrated luminosity of 955 fb − 1 . We also search for double charmonium production in e + e − → η c J/ψ via initial state radiation near the η c J/ψ threshold. No evident signal of the double charmonium state is found, but evidence for the e + e − → η c J/ψ process is found with a statistical significance greater than 3 . 3 σ near the η c J/ψ threshold. The average cross section near the threshold is measured and upper limits of cross sections are set for other regions.