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

Suyong Choi,S. L. Olsen,Kazuo Abe,T. Abe,I. Adachi,Byoung Sup Ahn,Hiroaki Aihara,K. Akai,M. Akatsu,M. Akemoto,Y. Asano,Tsukasa Aso,V.M. Aulchenko,T. Aushev,A. M. Bakich,Yong Ban,S. Banerjee,A. Bondar,A. Bozek,M. Bračko,Jolanta Brodzicka,T. E. Browder,P. Chang,Y. Chao,K. F. Chen,Byung Gu Cheon,R. Chistov,Y. Choi,Young-Il Choi,M. Danilov,L. Y. Dong,A. Drutskoy,Semen Eidelman,V. Eiges,J.W. Flanagan,Chikara Fukunaga,Kazuro Furukawa,N. Gabyshev,T. J. Gershon,B. Golob,H. Guler,R. Guo,C. Hagner,F. Handa,T. Hara,N. C. Hastings,H. Hayashii,Masashi Hazumi,L. Hinz,Y. Hoshi,W. S. Hou,Y. B. Hsiung,H. C. Huang,T. Iijima,K. Inami,A. Ishikawa,R. Itoh,M. Iwasaki,Y. Iwasaki,J. H. Kang,S. U. Kataoka,N. Katayama,H. Kawai,T. Kawasaki,H. Kichimi,Eiji Kikutani,H. J. Kim,Hyunwoo Kim,Jung-Hyun Kim,Seong Keun Kim,K. Kinoshita,Haruyo Koiso,Patrick Koppenburg,S. Korpar,P. Križan,P. Krokovny,Suneel Kumar,A.S. Kuzmin,J. S. Lange,G. Leder,S. H. Lee,T. Lesiak,S. W. Lin,D. Liventsev,J. MacNaughton,Gobinda Majumder,F. Mandl,Daniel Robert Marlow,T. Matsumoto,Shinichiro Michizono,Toshihiro Mimashi,W. A. Mitaroff,K. Miyabayashi,H. Miyake,D. Mohapatra,G. R. Moloney,T. Nagamine,Yasushi Nagasaka,T. Nakadaira,Takashi Nakamura

Physical Review Letters（2003）

Cited 1237|Views53

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Abstract

We report the observation of a narrow charmoniumlike state produced in the exclusive decay process B+/--->K+/-pi(+)pi(-)J/psi. This state, which decays into pi(+)pi(-)J/psi, has a mass of 3872.0+/-0.6(stat)+/-0.5(syst) MeV, a value that is very near the M(D0)+M(D(*0)) mass threshold. The results are based on an analysis of 152M B-Bmacr; events collected at the Upsilon(4S) resonance in the Belle detector at the KEKB collider. The signal has a statistical significance that is in excess of 10sigma.

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