Se p 19 99 ψ ( 2 S ) → π + π − J / ψ Decay Distributions †
J. Z. Bai,Y. Ban,J. G. Bian,I. Blum,G. P. Chen,H. F. Chen,J. Chen,J. C. Chen,Y. Chen,Y. B. Chen,Y. Q. Chen,B. S. Cheng,X. Z. Cui,H. L. Ding,L. Y. Dong,Z. Z. Du,W. Dunwoodie,C. S. Gao,M. L. Gao,S. Q. Gao,P. Gratton,J. H. Gu,S. D. Gu,W. X. Gu,Y. F. Gu,Z. J. Guo,Y. N. Guo,S. W. Han,Y. Han,F. A. Harris,J. He,J. T. He,K. L. He,M. He,Y. K. Heng,D. G. Hitlin,G. Y. Hu,H. M. Hu,J. L. Hu,Q. H. Hu,T. Hu,X. Q. Hu,G. S. Huang,Y. Z. Huang,J. M. Izen,C. H. Jiang,Y. Jin,B. D. Jones,X. Ju,Z. J. Ke,M. H. Kelsey,B. K. Kim,D. Kong,Y. F. Lai,P. F. Lang,A. Lankford,C. G. Li,D. Li,H. B. Li,J. Li,J. C. Li,P. Q. Li,R. B. Li,W. Li,W. G. Li,X. H. Li,X. N. Li,H. M. Liu,J. Liu,R. G. Liu,Y. Liu,X. C. Lou,B. Lowery,F. Lu,J. G. Lu,X. L. Luo,E. C. Ma,J. M. Ma,R. Malchow,H. S. Mao,Z. P. Mao,X. C. Meng,J. Nie,S. L. Olsen,J. Oyang,D. Paluselli,L. J. Pan,J. Panetta,F. Porter,N. D. Qi,X. R. Qi,C. D. Qian,J. F. Qiu,Y. H. Qu,Y. K. Que,G. Rong,M. Schernau,Y. Y. Shao,B. W. Shen,D. L. Shen,H. Shen,X. Y. Shen,H. Y. Sheng,H. Z. Shi,X. F. Song,J. Standifird,F. Sun,H. S. Sun,Y. Sun,Y. Z. Sun,S. Q. Tang,W. Toki,G. L. Tong,G. S. Varner,F. Wang,L. S. Wang,L. Z. Wang,M. Wang,P. Wang,P. L. Wang,S. M. Wang,T. J. Wang,Y. Y. Wang,M. Weaver,C. L. Wei,N. Wu,Y. G. Wu,D. M. Xi,X. M. Xia,P. P. Xie,Y. Xie,Y. H. Xie,G. F. Xu,S. T. Xue,J. Yan,W. G. Yan,C. M. Yang,C. Y. Yang,H. X. Yang,J. Yang,W. Yang,X. F. Yang,M. H. Ye,S. W. Ye,Y. X. Ye,C. S. Yu,C. X. Yu,G. W. Yu,Y. H. Yu,Z. Q. Yu,C. Z. Yuan,Y. Yuan,B. Y. Zhang,C. Zhang,C. C. Zhang,D. H. Zhang,Dehong Zhang,H. L. Zhang,J. Zhang,J. W. Zhang,L. Zhang,L. S. Zhang,P. Zhang,Q. J. Zhang,S. Q. Zhang,X. Y. Zhang,Y. Y. Zhang,D. X. Zhao,H. W. Zhao,Jiawei Zhao,J. W. Zhao,M. Zhao,W. R. Zhao,Z. G. Zhao,J. P. Zheng,L. S. Zheng,Z. P. Zheng,B. Q. Zhou,G. P. Zhou,H. S. Zhou,L. Zhou,K. J. Zhu,Q. M. Zhu,Y. C. Zhu,Y. S. Zhu,B. A. Zhuang
semanticscholar（2008）
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摘要
Using a sample of 3.8 M ψ(2S) events accumulated with the BES detector, the process ψ(2S) → π+π−J/ψ is studied. The angular distributions are compared with the general decay amplitude analysis of Cahn. We find that the dipion system requires some D-wave, as well as S-wave. On the other hand, the J/ψ (π+π−) relative angular momentum is consistent with being pure S-wave. The decay distributions have been fit to heavy quarkonium models, including the Novikov-Shifman model. This model, which is written in terms of the parameter κ, predicts that D-wave should be present. We determine κ = 0.183 ± 0.002 ± 0.003 based on the joint mππ cos θ π distribution. The fraction of D-wave as a function of mππ is found to decrease with increasing mππ, in agreement with the model. We have also fit the Mannel-Yan model, which is another model that allows D-wave.
