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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2007, vol. 99, p. -

Observation of two resonant structures in e+e-→π+π-ψ(2S) via initial-state radiation at Belle

Wang X. L., Yuan C. Z., Shen C. P., Wang P., Adachi I., Aihara H., Arinstein K., Aushev T., Bakich A. M., Barberio E., Bedny I., Bhardwaj V., Bitenc U., Blyth S., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chang P., Chen A., Chen K. F., Cheon B. G., Chiang C. C., Chistov R., Cho I. S., Choi S. K., Choi Y., Dalseno J., Danilov M., Dash M., Drutskoy A., Eidelman S., Epifanov D., Gabyshev N., Go A., Gokhroo G., Ha H., Hayasaka K., Hayashii H., Hazumi M., Heffernan D., Hoshi Y., Hou W. S., Hyun H. J., Iijima T., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki Y., Kah D. H., Kang J. H., Kawai H., Kawasaki T., Kichimi H., Kim H. O., Kim S. K., Kim Y. J., Kinoshita K., Korpar S., Križan P., Krokovny P., Kumar R., Kuo C. C., Kuzmin A., Lange J. S., Lee J. S., Lee M. J., Lee S. E., Lesiak T., Limosani A., Lin S. W., Liu Y., Liventsev D., Mandl F., McOnie S., Medvedeva T., Miyabayashi K., Miyake H., Miyata H., Mizuk R., Mori T., Nakano E., Nakao M., Nakazawa H., Natkaniec Z., Nishida S., Nitoh O., Noguchi S., Ogawa S., Ohshima T., Okuno S., Olsen S. L., Ozaki H.

The cross section for e+e-→π+π-ψ(2S) between threshold and s=5.5GeV is measured using 673fb-1 of data on and off the Υ(4S) resonance collected with the Belle detector at KEKB. Two resonant structures are observed in the π+π-ψ(2S) invariant-mass distribution, one at 4361±9±9MeV/c2 with a width of 74±15±10MeV/c2, and another at 4664±11±5MeV/c2 with a width of 48±15± 3MeV/c2, if the mass spectrum is parametrized with the coherent sum of two Breit-Wigner functions. These values do not match those of any of the known charmonium states. © 2007 The American Physical Society.