Search for the double-charmonium state with ηcJ/ψ at Belle

Yin, J. H.; Li, Y. B.; Won, E.; Adachi, I.; Aihara, H.; Al Said, S.; Asner, D. M.; Aushev, T.; Ayad, R.; Babu, V.; Banerjee, Sw; Behera, P.; Belous, K.; Bennett, J.; Bessner, M.; Bilka, T.; Biswas, D.; Bodrov, D.; Bonvicini, G.; Borah, J.; Bozek, A.; Bračko, M.; Branchini, P.; Browder, T. E.; Budano, A.; Červenkov, D.; Chang, M. -C.; Cheon, B. G.; Chilikin, K.; Cho, H. E.; Cho, K.; Choi, S. -K.; Choi, Y.; Choudhury, S.; Cinabro, D.; Cochran, J.; Das, S.; De Nardo, G.; De Pietro, G.; Dhamija, R.; Di Capua, F.; Dingfelder, J.; Doležal, Z.; Dong, T. V.; Epifanov, D.; Ferber, T.; Ferlewicz, D.; Fulsom, B. G.; Gaur, V.; Giri, A.; Goldenzweig, P.; Graziani, E.; Gu, T.; Guan, Y.; Gudkova, K.; Hadjivasiliou, C.; Halder, S.; Hara, T.; Hayasaka, K.; Hayashii, H.; Herrmann, D.; Hou, W. -S.; Hsu, C. -L.; Iijima, T.; Ipsita, N.; Ishikawa, A.; Itoh, R.; Iwasaki, M.; Jacobs, W. W.; Ji, Q. P.; Jia, S.; Jin, Y.; Joo, K. K.; Kahn, J.; Kaliyar, A. B.; Kawasaki, T.; Kiesling, C.; Kim, C. H.; Kim, D. Y.; Kim, K. -H.; Kim, Y. -K.; Kindo, H.; Kinoshita, K.; Kodyš, P.; Korobov, A.; Korpar, S.; Kovalenko, E.; Križan, P.; Krokovny, P.; Kuhr, T.; Kumar, M.; Kumar, R.; Kumara, K.; Lam, T.; Lange, J. S.; Lee, S. C.; Li, L. K.; Li, Y.; Libby, J.; Lieret, K.; Lin, Y. -R.; Liventsev, D.; Masuda, M.; Matsuda, T.; Matvienko, D.; Maurya, S. K.; Meier, F.; Merola, M.; Metzner, F.; Mizuk, R.; Mohanty, G. B.; Mussa, R.; Nakamura, I.; Narwal, D.; Natkaniec, Z.; Natochii, A.; Nayak, L.; Nayak, M.; Nisar, N. K.; Nishida, S.; Ogawa, S.; Ono, H.; Oskin, P.; Pakhlova, G.; Pardi, S.; Park, H.; Park, J.; Park, S. -H.; Passeri, A.; Patra, S.; Paul, S.; Pestotnik, R.; Piilonen, L. E.; Podobnik, T.; Prencipe, E.; Prim, M. T.; Rout, N.; Russo, G.; Sandilya, S.; Sangal, A.; Santelj, L.; Savinov, V.; Schnell, G.; Schwanda, C.; Seino, Y.; Senyo, K.; Shan, W.; Shapkin, M.; Sharma, C.; Shiu, J. -G.; Solovieva, E.; Starič, M.; Stottler, Z. S.; Sumihama, M.; Takizawa, M.; Tanida, K.; Tenchini, F.; Tiwary, R.; Uchida, M.; Uglov, T.; Unno, Y.; Uno, S.; Usov, Y.; Vahsen, S. E.; Varner, G.; Vinokurova, A.; Wang, D.; Wang, E.; Wang, M. -Z.; Wang, X. L.; Watanuki, S.; Werbycka, O.; Xu, X.; Yabsley, B. D.; Yan, W.; Yang, S. B.; Yelton, J.; Yook, Y.; Yuan, C. Z.; Zhang, Z. P.; Zhilich, V.; Zhukova, V.

doi:10.1007/jhep08(2023)121

Title: Search for the double-charmonium state with ηcJ/ψ at Belle

Journal Article · 18 August 2023 · Journal of High Energy Physics (Online)

DOI: https://doi.org/10.1007/jhep08(2023)121 · OSTI ID:2424184

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We measure the cross section of e⁺e^- → ηcJ/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^- → ηcJ/ψ via initial state radiation near the ηcJ/ψ threshold. No evident signal of the double charmonium state is found, but evidence for the e⁺e^- → ηcJ/ψ process is found with a statistical significance greater than 3.3σ near the ηcJ/ψ threshold. The average cross section near the threshold is measured and upper limits of cross sections are set for other regions.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Sciences Laboratory (EMSL)

Sponsoring Organization:: USDOE

Contributing Organization:: Belle collaboration

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 2424184

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 8 Vol. 2023; ISSN 1029-8479

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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