First observation of χcJ→ωω decays

M. Ablikim,J. Z. Bai,Y. Ban,J. G. Bian,XZ（蔡翔舟） Cai,H. F. Chen,H. S. Chen,Huirun Chen,J. C. Chen,Jin Chen,Y. B. Chen,S. P. Chi,Y. P. Chu,Xingzhu Cui,Y. S. Dai,Z. Y. Deng,L. Y. Dong,Q. F. Dong,S. X. Du,Z. Z. Du,J. Fang,S. S. Fang,C. D. Fu,C. S. Gao,Y. N. Gao,S. D. Gu,Y. T. Gu,Y. N. Guo,Y. Q. Guo,Z.J. Guo,F. A. Harris,K. L. He,M. He,Y. K. Heng,H. M. Hu,T. Hu,G. S. Huang,Xiru Huang,X. T. Huang,X. B. Ji,X. S. Jiang,J. B. Jiao,D. P. Jin,S. Jin,Yi Jin,Y. F. Lai,G. Li,H. B. Li,Hangxu Li,J. C. Li,R. Y. Li,S. M. Li,W. D. Li,W. G. Li,X.L. Li,X. Q. Li,Y.L. Li, Y. F. Liang,H.B. Liao,C. X. Liu,F. Liu,Fang Liu,H. H. Liu,H. M. Liu,J. H. Liu,J. B. Liu,J. P. Liu,R. G. Liu,Z. A. Liu,F. Lu,G. R. Lu,Houbing Lu,J. G. Lu,C. L. Luo,F. C. Ma,H. L. Ma,L. L. Ma,Q. M. Ma,X. B. Ma,Z. P. Mao,X. H. Mo,J. Nie,S.L. Olsen,Haiping Peng,N. D. Qi,H. Qin,J. F. Qiu,Z. Y. Ren,G. Rong,Lianyou Shan,Shang Lunlin,D. L. Shen,X. Y. Shen,H. Y. Sheng,Feng Shi, X. Shi,H. S. Sun,Jianwei Sun,S. S. Sun,Y. Z. Sun

Physics Letters B（2005）

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摘要

Decays Of Xc0,2 -> omega omega are observed for the first time using a sample of 14.0 x 10(6) Psi(2S) events collected with the BESII detector. The branching ratios are determined to be B(Xc0 -> omega omega) = (2.29 +/- 0.58 +/- 0.41) x 10(-3) and B(Xc2 -> omega omega = (1.77 +/- 0.47 +/- 0.36) x 10(-3), where the first errors are statistical and the second systematic. The significances of the two signals are 4.4 sigma and 4.7 sigma, respectively. (c) 2005 Elsevier B.V. All rights reserved.

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decays,first observation

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