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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2003, vol. 70, p. 071102-1

Study of double charmonium production in e<sup>+</sup>e<sup>-</sup> annihilation at √s ≈ 10.6 GeV

Abe K., Abe K., Aihara H., Asano Y., Aulchenko V., Aushev T., Bahinipati S., Bakich A. M., Ban Y., Bedny I., Bitenc U., Bizjak I., Blyth S., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chao Y., Cheon B. G., Chistov R., Choi S. K., Choi Y., Chuvikov A., Cole S., Danilov M., Dash M., Dong L. Y., Eidelman S., Eiges V., Fang F., Fratina S., Gabyshev N., Gershon T., Gokhroo G., Golob B., Guo R., Haba J., Hastings N. C., Hayasaka K., Hayashii H., Hazumi M., Higuchi T., Hinz L., Hokuue T., Hoshi Y., Hou W. S., Hsiung Y. B., Iijima T., Imoto A., Inami K., Ishikawa A., Itoh R., Iwasaki H., Iwasaki M., Iwasaki Y., Kang J. H., Kang J. S., Katayama N., Kawai H., Kawasaki T., Khan H. R., Kim H. J., Koppenburg P., Križan P., Krokovny P., Kumar S., Kwon Y. J., Lange J. S., Leder G., Lesiak T., Li J., Lin S. W., MacNaughton J., Majumder G., Mandl F., Matsumoto T., Matyja A., Mitaroff W., Miyake H., Miyata H., Mizuk R., Mori T., Nagamine T., Nagasaka Y., Nakano E., Nakao M., Natkaniec Z., Nishida S., Nozaki T., Ogawa S., Ohshima T., Okabe T., Okuno S., Olsen S. L., Ostrowicz W., Ozaki H.

We present a new analysis of double charmonium production in e <sup>+</sup>e<sup>-</sup> annihilation. The observation of the processes e <sup>+</sup> e<sup>-</sup> → J/ψη<inf>c</inf>, J/ ψχ<inf>c0</inf>, and J/ψη<inf>c</inf>(2S) is confirmed using a data set more than 3 times larger than that of Belle's previous report, and no evidence for the process e<sup>+</sup>e<sup>-</sup> → J/ψJ/ψ is found. We perform an angular analysis for J/ψη<inf>c</inf> production and set an upper limit on the production of J/ψJ/ψ. Processes of the type e<sup>+</sup>e<sup>-</sup> → ψ(2S)(cc)<inf>res</inf> have been observed for the first time; their rates are found to be comparable to those of e<sup>+</sup>e<sup>-</sup> → J/ψ(cc)<inf>res</inf> processes.