Partial wave analyses of J/ψ→γπ+π−J/ψ→γπ+π− and γπ0π0γπ0π0

M Ablikim,J Z Bai,Y Ban,J G Bian,Xu Cai,H F Chen,J C Chen,Y B Chen,S P Chi,Y P Chu,X Z Cui,Y S Dai,L Y Diao,Z Y Deng,Q F Dong,S X Du,J Fang,S S Fang,C D Fu,C S Gao,Y N Gao,S D Gu,Y T Gu,Y N Guo,Z J Guo,F A Harris,K L He,M He,Y K Heng,H M Hu,T Hu,G S Huang,X T Huang,X B Ji,X Y Jiang,J B Jiao,D P Jin,S Jin,Yi Jin,Y F Lai,Guangda Li,H B Li,Jin Li,R Y Li,S M Li,W G Li,X L Li,Y L Li,Y F Liang,H B Liao,B J Liu,C X Liu,Feng Liu,H M Liu,J B Liu,Qi Liu,R G Liu,Z A Liu,Y C Lou,Fei Lu,G R 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,Jingxin Nie,S L Olsen,H P Peng,R G Ping,N D Qi,Huafeng Qin,J F Qiu,Z Y Ren,G Rong,L Y Shan,L Shang,C P Shen,D L Shen,X Y Shen,H Y Sheng,H S Sun,J F Sun,S S Sun,Y Z Sun,Z J Sun,Z Q Tan,Xiaoyan Tang,G L Tong,G Varner,D Y Wang,L L Wang, Mingkui Wang,P L Wang,W F Wang,Y F Wang,Z Y Wang,C L Wei,D H Wei,N Wu,X M Xia,X X Xie,G F Xu,X P Xu,Yongping Xu,M L Yan,H X Yang,Y X Yang,M H Ye,Y X Ye,Z Y Yi,G W Yu,C Z Yuan,J M Yuan,Yanwen Yuan,S L Zang,Yinming Zeng,B Y Zhang,C C Zhang,Dong H Zhang,H Y Zhang,J Y Zhang,S H Zhang,X Y Zhang,Yiyun Zhang,Z P Zhang,D X Zhao,J W Zhao,M G Zhao,P P Zhao,W R Zhao,Z G Zhao,H Q Zheng,J P Zheng,Z P Zheng,Li Zhou,N F Zhou,K J Zhu,Q M Zhu,Y C Zhu,Z A Zhu,B A Zhuang,X A Zhuang,B S Zou

Physics Letters B（2006）

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摘要

Results are presented on J/ψ radiative decays to π+π− and π0π0 based on a sample of 58M J/ψ events taken with the BES II detector. Partial wave analyses are carried out using the relativistic covariant tensor amplitude method in the 1.0 to 2.3GeV/c2ππ mass range. There are conspicuous peaks due to the f2(1270) and two 0++ states in the 1.45 and 1.75 GeV/c2 mass regions. The first 0++ state has a mass of 1466±6±20MeV/c2, a width of 108−11+14±25MeV/c2, and a branching fraction B(J/ψ→γf0(1500)→γπ+π−)=(0.67±0.02±0.30)×10−4. Spin 0 is strongly preferred over spin 2. The second 0++ state peaks at 1765−3+4±13MeV/c2 with a width of 145±8±69MeV/c2. If this 0++ is interpreted as coming from f0(1710), the ratio of its branching fractions to ππ and KK¯ is 0.41−0.17+0.11.

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12.39.Mk,13.25.Gv,14.40.Cs

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