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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2010, vol. 104, p. -

Observation of a charmoniumlike enhancement in the γγ→ ωJ/ψ Process

Uehara S., Aushev T., Bakich A. M., Belous K., Bhardwaj V., Bischofberger M., Bračko M., Browder T. E., Chang P., Chen A., Chen P., Cheon B. G., Chiang C. C., Cho I. S., Choi S. K., Choi Y., Dalseno J., Drutskoy A., Eidelman S., Epifanov D., Feindt M., Gabyshev N., Ha H., Haba J., Hayasaka K., Hayashii H., Hoshi Y., Hou W. S., Hsiung Y. B., Hyun H. J., Inami K., Itoh R., Iwabuchi M., Iwasaki M., Iwasaki Y., Joshi N. J., Kang J. H., Kawasaki T., Kiesling C., Kim H. J., Kim J. H., Kim Y. I., Kim Y. J., Ko B. R., Kodyš P., Korpar S., Križan P., Krokovny P., Kumita T., Kuzmin A., Kwon Y. J., Kyeong S. H., Lange J. S., Lee M. J., Lee S. H., Li J., Liu C., Liu Y., Liventsev D., Louvot R., Matyja A., McOnie S., Miyabayashi K., Miyata H., Miyazaki Y., Mizuk R., Mussa R., Nakano E., Nakao M., Nakazawa H., Natkaniec Z., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okuno S., Olsen S. L., Pakhlov P., Pakhlova G., Park C. W., Park H., Park H. K., Pestotnik R., Petrič M., Piilonen L. E., Röhrken M., Ryu S., Sahoo H., Sakai Y., Schneider O.

We report the results of a search for a charmoniumlike state produced in the process γγ→ωJ/ψ in the 3.9-4.2GeV/c2 mass region. We observe a significant enhancement, which is well described by a resonant shape with mass M=(3915±3±2)MeV/c2 and total width Γ=(17±10±3)MeV. This enhancement may be related to one or more of the three charmoniumlike states so far reported in the 3.90-3.95GeV/c2 mass region. © 2010 The American Physical Society.