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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2003, vol. 91, p. 2620011-2620016

Observation of a Narrow Charmoniumlike State in Exclusive B ± → K±π+π- J/Ψ Decays

Choi S. K., Olsen S. L., Abe K., Abe T., Adachi I., Ahn Byoung Sup, Aihara H., Akai K., Akatsu M., Akemoto M., Asano Y., Aso T., Aulchenko V., Aushev T., Bakich A. M., Ban Y., Banerjee S., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chang P., Chao Y., Chen K. F., Cheon B. G., Chistov R., Choi Y., Choi Y. K., Danilov M., Dong L. Y., Drutskoy A., Eidelman S., Eiges V., Flanagan J., Fukunaga C., Furukawa K., Gabyshev N., Gershon T., Golob B., Guler H., Guo R., Hagner C., Handa F., Hara T., Hastings N. C., Hayashii H., Hazumi M., Hinz L., Hoshi Y., Hou W. S., Hsiung Y. B., Huang H. C., Iijima T., Inami K., Ishikawa A., Itoh R., Iwasaki M., Iwasaki Y., Kang J. H., Kataoka S. U., Katayama N., Kawai H., Kawasaki T., Kichimi H., Kikutani E., Kim H. J., Kim Hyunwoo, Kim J. H., Kim S. K., Kinoshita K., Koiso H., Koppenburg P., Korpar S., Križan P., Krokovny P., Kumar S., Kuzmin A., Lange J. S., Leder G., Lee S. H., Lesiak T., Lin S. W., Liventsev D., MacNaughton J., Majumder G., Mandl F., Marlow D., Matsumoto T., Michizono S., Mimashi T., Mitaroff W., Miyabayashi K., Miyake H.

A narrow charmoniumlike state in exclusive B±→K ±π+π-J/φ decays was observed. This mass value and the absence of a strong signal in the γχc1 decay channel were in some disagreement with potential model expectations for the 3Dc2 charmonium state. The mass was within errors at the D0D*0 mass threshold. The results show that charmonium decays to ρJ/φ violate isospin and are expected to be suppressed.