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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2007, vol. 98, p. -

Observation of a charmoniumlike state produced in association with a J/ψ in e+e- annihilation at s 10.6GeV

Abe K., Adachi I., Aihara H., Arinstein K., Asano Y., Aulchenko V., Aushev T., Aziz T., Bakich A. M., Balagura V., Barbero M., Bedny I., Bitenc U., Bizjak I., Bondar A., Bračko M., Brodzicka J., Browder T. E., Chao Y., Chen A., Cheon B. G., Chistov R., Choi S. K., Choi Y., Choi Y. K., Chuvikov A., Cole S., Dalseno J., Danilov M., Dash M., Drutskoy A., Eidelman S., Epifanov D., Fratina S., Gabyshev N., Gershon T., Gokhroo G., Golob B., Ha H. C., Haba J., Hasegawa Y., Hayasaka K., Hayashii H., Hazumi M., Hinz L., Hoshi Y., Hou S., Hou W. S., Hsiung Y. B., Iijima T., Ishikawa A., Iwasaki M., Iwasaki Y., Kapusta P., Kawasaki T., Khan H. R., Kichimi H., Kim H. J., Kim S. M., Kinoshita K., Korpar S., Krokovny P., Kuo C. C., Kuzmin A., Lange J. S., Leder G., Lesiak T., Limosani A., Lin S. W., Liventsev D., Mandl F., Matsumoto T., Matyja A., Mikami Y., Mitaroff W., Miyabayashi K., Miyata H., Mizuk R., Nagasaka Y., Nakano E., Nakao M., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okuno S., Olsen S. L., Ozaki H., Pakhlov P., Palka H., Park C. W., Park H., Park K. S., Peak L. S., Piilonen L. E., Poluektov A.

We report the first observation of a charmoniumlike state recoiling from the J/ψ in the inclusive process e+e-→J/ψ+anything at a mass of (3.943±0.006±0.006)GeV/c2. We also observe the decay of this state into D*D̄ and determine its intrinsic width to be less than 52MeV/c2 at the 90% C.L. These results are obtained from a 357fb-1 data sample collected with the Belle detector near the Υ(4S) resonance, at the KEKB asymmetric-energy e+e- collider. © 2007 The American Physical Society.