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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2006, vol. 96, p. -

Observation of a χc2′ candidate in γγ→DD̄ production at belle

Uehara S., Abe K., Adachi I., Aihara H., Arinstein K., Asano Y., Aulchenko V., Aushev T., Bakich A. M., Balagura V., Barberio E., Bedny I., Belous K., Bitenc U., Bizjak I., Blyth S., Bondar A., Bozek A., Bračko M., Browder T. E., Chang M. C., Chen A., Chen W. T., Cheon B. G., Chistov R., Choi S. K., Choi Y., Choi Y. K., Chuvikov A., Dalseno J., Danilov M., Dash M., Dragic J., Eidelman S., Epifanov D., Fratina S., Gabyshev N., Garmash A., Gershon T., Gokhroo G., Gorišek A., Ha H. C., Hayasaka K., Hayashii H., Hazumi M., Hinz L., Hoshi Y., Hou S., Iijima T., Inami K., Ishikawa A., Itoh R., Iwasaki M., Iwasaki Y., Katayama N., Kawai H., Kawasaki T., Kichimi H., Kim H. J., Kim S. M., Korpar S., Krokovny P., Kulasiri R., Kuo C. C., Kuzmin A., Kwon Y. J., Lange J. S., Leder G., Lee S. E., Lesiak T., Li J., Lin S. W., Liventsev D., Mandl F., Matsumoto T., Matyja A., Mitaroff W., Miyabayashi K., Miyata H., Miyazaki Y., Mizuk R., Nagamine T., Nagasaka Y., Nakano E., Nakao M., Nakazawa H., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okabe T., Okuno S., Olsen S. L., Pakhlov P., Park C. W., Park H.

We report on a search for new resonant states in the process γγ→DD̄. A candidate C-even charmonium state is observed in the vicinity of 3.93GeV/c2. The production rate and the angular distribution in the γγ center-of-mass frame suggest that this state is the previously unobserved χc2′, the 2P23 charmonium state. © 2006 The American Physical Society.