Measurement Of The Matrix Elements For The Decays Eta -> Pi(+)Pi(-)Pi(0) And Eta/Eta ' -> Pi(0)Pi(0)Pi(0)

M Ablikim,H L Ren,T Hussain, Hui Wu Yu,T Held, G Varner,F H Liu, T Li,W X Gong,Z Y He,X Tang,Wei Shan,Y Hu,J F Qiu, Z Y Zhang,Siwei Zhu,J Z Zhao,R A Briere, P F Duan,A Zhemchugov,K Goetzen,J S Yu,S L Olsen,H M Hu,M Kavatsyuk,K Peters,I Tapan,Y G Xie,L S Wang,Y N Pu,Y F Wang,Z Y Deng, S A Cetin,H P Peng,Min Wang,S Pacetti,Bohong Zheng,Z G Zhao,Y J Mao, I Boyko,S X Du,H L Dai,M Destefanis, Gamg M Huang,H P Cheng,T Luo,Martin Albrecht,Y P Guo,Y B Zhao,P L Wang,Teng Ma,A Kupsc,Q Gao, H Y Zhang, K Y Liu,C C Zhang,B L Wang,Yun Huang, J Y Zhang,M N Achasov,D X Lin,Thomas P Weber,C H Li,K Moriya,U Wiedner,Z H Wang,Y J Mo,Y H Guan, B Y Zhang, T Hu,X X Liu, Xiu Feng Wang, C Dong,X T Huang,Z B Li,Zongxia Jiao, L Zotti,H P Huang,E Fioravanti,J C Li, J L Ping,R E Mitchell,G Rong,D Bettoni, Lei Li, S Marcello,H Y Sheng,D M Li, Z Ning,Jonas Pettersson,Y J Sun,Z Haddadi,A Calcaterra,X N Ma,T C Zhao,S S Fang, Lizhong Zhou,F C Ma,I Uman, S Sosio,A Q Guo, B J Liu, I Garzia, C Z Yuan,L G Xia,Q P Ji,L Q Qin,Quanfu An,A G Denig, J S Lange,X Y Song,W J Zheng,Shuang Han, J S Huang, A Zallo,C X Yu,A Hafner,D Y Wang,C D Fu,O Cakir,K L He, E H Thorndike,J P Zheng, J P Liu, M Tiemens,M Shao,Z A Zhu, M Qi,Z A Liu,S P Wen,K Schoenning,O Albayrak,X Y Shen, Y B Liu,G F Xu,C F Qiao,X R Chen,Y T Gu, Q W Zhao,J C Chen,H B Li,J B Jiao,Y Nefedov,F E Maas,A Amoroso, L Fava,F F An,Ch Rosner,G Cibinetto,H J Lu,X Y Niu,H Liang,Y H Zheng,L H Wu,Z T Sun, D W Bennett,B X Yu,Z H Qin,F Bianchi,S J Zhao,Yan Ding,Genming Zhao,Xin Cai, A Dbeyssi, C L Luo,R Baldini Ferroli, L W Jiang,Qun Ouyang, C P Shen,Ling Yan, R Kliemt,P R Li, M X Luo, C F Redmer,Y S Zhu,Qiong Liu,M Pelizaeus,X C Ai,Y P Lu,H L Ma,Jinsheng Fang,Haifeng Ye,N Qin,W D Li, X L Luo, L D Liu,L Y Dong, J B Wei, B C Ke,B Zhong,Z J Xiao, R Poling, S B Liu,J Min,W Gradl, H Y Chen,T J Min,A V Sarantsev,Xiuqin Fang, P L Liu,L B Guo, B S Zou,C Q Feng,X L Ji, H Loehner,Yanzhi Xia,H Muramatsu,X Y Gao, G Li,C J Tang,C X Liu,Lin Xu,E Boger,M Maggiora,Jing Dong,Z P Mao, A Yuncu, Y H Yan,D Xiao,J F Chang,W Kuhn,H M Liu,M L Chen,Sijin Qian, M Ripka,Changzheng Hu,Y B Chen,F A Harris,Xi Peng Xu,S G Wang,Z Gao,Kuhan Wang,J F Sun,G Felici,Lixin Yang, C Geng,S Nisar, J H Yin,C Morales Morales,S S Sun, M Bertani, K J Zhu,X Q Hao, J Z Bai,M H Ye,Q M Ma,K H Rashid,X C Lou,V Santoro,D P Jin,N Kalantarnayestanaki, L L Ma,M G Zhao, A Julin,X S Kang, D V Dedovich, F Nerling,J M Bian,Keshen Li, Y Zeng,D H Wei,M H Gu, J G Messchendorp,R G Ping,X Y Jiang,Vinod K Prasad,J Z Fan,N Yu Muchnoi, D H Zhang,Jian Hua Zou,M Greco,X N Li, E E Eren,Y F Liang,G R Liao,P Weidenkaff,X D Ruan,Zefei Wu,J V Bennett, Q J Xu,Wenhua Wang,P Patteri, X R Zhou,I Denysenko, S H Zhang,Tord Johansson,W L Yuan,Yushun Gao,M Kornicer,Chenlei Leng,I B Nikolaev, P Kiese,G Chen,W M Song, P Larin,S Schumann,Lei Zhao,M Y Dong,Ming Lv,X H Mo,Lei Zhang,X S Qin,J F Hu,Y Qin, B Kloss,G F Cao,W B Yan,S Spataro,Y Fang,S J Chen,X K Chu,M S Ullrich, H J Yang, M Wolke,M Savrie, S L Niu, X Y Zhang,Fangting Li, Y Ban,J P Dai, O B Kolcu,J G Lu, P X Shen,A A Zafar, B Kopf,J Zhuang, Yi Na Zhang,K Zhang, S Jin,M Lara,Y Yuan,Q L Xiu,Y X Yang, Z L Hou, R Q Lu,Gueorgui Chelkov,Hui Cai,D Ambrose,F Feldbauer,F De Mori,M Fritsch, X L Zhu,Y K Heng,G X Sun, X R Lyu,Y L Han

PHYSICAL REVIEW D（2015）

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摘要

Based on a sample of 1.31 x 10(9) J/psi events collected with the BESIII detector at the BEPCII collider, Dalitz plot analyses of selected 79,625 eta -> pi(+)pi(-)pi(0) events, 33,908 eta -> pi(0)pi(0)pi(0) events, and 1,888 eta' -> pi(0)pi(0)pi(0) events are performed. The measured matrix elements of eta -> pi(+)pi(-)pi(0) are in reasonable agreement with previous measurements. The Dalitz plot slope parameters of eta -> pi(0)pi(0)pi(0) and eta' -> pi(0)pi(0)pi(0) are determined to be -0.055 +/- 0.014 +/- 0.004 and -0.640 +/- 0.046 +/- 0.047, respectively, where the first uncertainties are statistical and the second systematic. Both values are consistent with previous measurements, while the precision of the latter one is improved by a factor of 3. Final state interactions are found to have an important role in those decays.

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