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

Measurement of the e+e-→π+π-J/ψ cross section via initial-state radiation at Belle

Yuan C. Z., Shen C. P., Wang P., McOnie S., Adachi I., Aihara H., Aulchenko V., Aushev T., Bahinipati S., Balagura V., Barberio E., Bedny I., Bitenc U., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chang M. C., Chang P., Chen A., Chen K. F., Chen W. T., Cheon B. G., Chistov R., Cho I. S., Choi Y., Dalseno J., Danilov M., Dash M., Eidelman S., Fratina S., Gabyshev N., Golob B., Ha H., Haba J., Hayasaka K., Hayashii H., Hazumi M., Heffernan D., Hokuue T., Hoshi Y., Hou W. S., Hsiung Y. B., Hyun H. J., Iijima T., Ikado K., Inami K., Ishikawa A., Itoh R., Iwasaki Y., Kah D. H., Kaji H., Kang J. H., Katayama N., Kawai H., Kawasaki T., Kichimi H., Kim Y. J., Kinoshita K., Korpar S., Križan P., Krokovny P., Kumar R., Kuo C. C., Kuzmin A., Kwon Y. J., Lee S. E., Lesiak T., Lin S. W., Liu Y., Liventsev D., Mandl F., Marlow D., Matyja A., Medvedeva T., Mitaroff W., Miyabayashi K., Miyake H., Miyata H., Miyazaki Y., Mizuk R., Mori T., Nagasaka Y., Nakao M., Natkaniec Z., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okuno S., Olsen S. L., Ozaki H., Pakhlov P., Pakhlova G.

The cross section for e+e-→π+π-J/ψ between 3.8 and 5.5GeV/c2 is measured using a 548fb-1 data sample collected on or near the Υ(4S) resonance with the Belle detector at KEKB. A peak near 4.25GeV/c2, corresponding to the so called Y(4260), is observed. In addition, there is another cluster of events at around 4.05GeV/c2. A fit using two interfering Breit-Wigner shapes describes the data better than one that uses only the Y(4260), especially for the lower-mass side of the 4.25 GeV enhancement. © 2007 The American Physical Society.