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

S. Uehara,Kazuo Abe,I. Adachi,Hiroaki Aihara, K. Arinstein,Y. Asano,V. M. Aulchenko,T. Aushev,A. M. Bakich,Vladislav Balagura,E. L. Barberio,I. Bedny,K. Belous,U. Bitenc,I. Bizjak,S. Blyth,A. Bondar,A. Bozek, M. Bračko,T. E. Browder,M. C. Chang,A. Chen,W. T. Chen,Byung Gu Cheon,R. Chistov,S. K. Choi,Y. Choi,Young-Il Choi,A. Chuvikov,J. Dalseno, M. Danilov,M. Dash,J. Dragic,S. Eidelman,D. Epifanov, S. Fratina,N. Gabyshev,A. Garmash, T. J. Gershon,G. Gokhroo,Andrej Gorišek, H. Ha,K. Hayasaka,H. Hayashii,Masashi Hazumi,L. Hinz,Y. Hoshi,S. R. Hou,T. Iijima, K. Inami,A. Ishikawa,R. Itoh,M. Iwasaki,Y. Iwasaki,N. Katayama,H. Kawai,T. Kawasaki,H. Kichimi,Hyun-Chul Kim,S. M. Kim,S. Korpar,P. Krokovny,R. Kulasiri,C. C. Kuo,A.S. Kuzmin,Youngil Kwon,J. S. Lange,G. Leder,S. E. Lee,T. Lesiak,J. Li,S. W. Lin,D. Liventsev,F. Mandl,T. Matsumoto,A. Matyja,W. A. Mitaroff,K. Miyabayashi,H. Miyata,Y. Miyazaki, R. Mizuk,T. Nagamine,Yasushi Nagasaka, E. Nakano,M. Nakao,H. Nakazawa,S. Nishida,O. Nitoh,S. Ogawa,T. Ohshima,T. Okabe,S. Okuno,S. L. Olsen,P. Pakhlov,C. W. Park,H. Park, R. Pestotnik,L. E. Piilonen,Anton Poluektov, Y. Sakai,Noriaki K. Sato,N. Satoyama,T. Schietinger,O. Schneider,K. Senyo,M. E. Sevior,M. Shapkin,H. Shibuya,B. Shwartz,V.A. Sidorov,Jasvinder A. Singh,A. Sokolov,A. Somov,N. Soni,Rainer Stamen,Samo Stanič,M. Starič,T. Sumiyoshi,F. Takasaki,K. Tamai,N. Tamura,M. H. Tanaka,G. N. Taylor,X. C. Tian,K. Trabelsi,T. Tsukamoto,T. Uglov,K. Ueno,S. Uno,Phillip Urquijo,Yu. V. Usov, G. S. Varner,Y. Watanabe, E. Won,Q. L. Xie,B. D. Yabsley,A. Yamaguchi,M. Yamauchi,J. Ying,C. Zhang, Jie Zhang,Long Zhang,Zhenyu Zhang,V.N. Zhilich

Physical Review Letters（2006）

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摘要

We report on a search for new resonant states in the process gamma gamma -> D (D) over bar. A candidate C-even charmonium state is observed in the vicinity of 3.93 GeV/c(2). The production rate and the angular distribution in the gamma gamma center-of-mass frame suggest that this state is the previously unobserved chi(')(c2), the 2(3)P(2) charmonium state.

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