Precision Study of η^{'}→γπ^{+}π^{-} Decay Dynamics.

M Ablikim,M N Achasov,S Ahmed,X C Ai,O Albayrak,M Albrecht,D J Ambrose,A Amoroso,F F An,Q An, J Z Bai,R Baldini Ferroli,Y Ban,D W Bennett,J V Bennett,N Berger,M Bertani,D Bettoni,J M Bian,F Bianchi,E Boger,I Boyko,R A Briere,H Cai,X Cai,O Cakir,A Calcaterra,G F Cao,S A Cetin,J Chai, J F Chang,G Chelkov,G Chen,H S Chen,J C Chen,M L Chen, S Chen, S J Chen,X Chen,X R Chen,Y B Chen,H P Cheng,X K Chu,G Cibinetto,H L Dai,J P Dai,A Dbeyssi,D Dedovich,Z Y Deng,A Denig,I Denysenko,M Destefanis,F De Mori,Y Ding,C Dong,J Dong,L Y Dong,M Y Dong,Z L Dou, S X Du,P F Duan,J Z Fan,J Fang,S S Fang,X Fang,Y Fang,R Farinelli,L Fava,O Fedorov,S Fegan, F Feldbauer,G Felici,C Q Feng,E Fioravanti,M Fritsch, C D Fu,Q Gao,X L Gao,Y Gao,Z Gao,I Garzia,K Goetzen,L Gong, W X Gong,W Gradl,M Greco,M H Gu, Y T Gu,Y H Guan,A Q Guo, L B Guo,R P Guo,Y Guo,Y P Guo,Z Haddadi,A Hafner,S Han, X Q Hao,F A Harris, K L He, F H Heinsius,T Held,Y K Heng,T Holtmann,Z L Hou,C Hu,H M Hu,J F Hu,T Hu,Y Hu,G S Huang,J S Huang,X T Huang,X Z Huang, Y Huang,Z L Huang,T Hussain,Q Ji,Q P Ji,X B Ji,X L Ji,L W Jiang,X S Jiang,X Y Jiang, J B Jiao,Z Jiao, D P Jin,S Jin,T Johansson,A Julin,N Kalantar-Nayestanaki,X L Kang,X S Kang,M Kavatsyuk, B C Ke,P Kiese,R Kliemt,B Kloss,O B Kolcu,B Kopf,M Kornicer,A Kupsc,W Kühn,J S Lange,M Lara,P Larin,H Leithoff,C Leng,C Li,Cheng Li,D M Li,F Li,F Y Li,G Li,H B Li,H J Li,J C Li,Jin Li,K Li,K Li,Lei Li,P R Li,Q Y Li,T Li,W D Li,W G Li,X L Li,X N Li,X Q Li,Y B Li,Z B Li,H Liang,Y F Liang,Y T Liang,G R Liao,D X Lin,B Liu,B J Liu,C X Liu,D Liu,F H Liu,Fang Liu,Feng Liu,H B Liu,H H Liu,H H Liu,H M Liu,J Liu,J B Liu,J P Liu,J Y Liu,K Liu,K Y Liu,L D Liu,P L Liu,Q Liu,S B Liu,X Liu,Y B Liu,Y Y Liu,Z A Liu,Zhiqing Liu,H Loehner,Y F Long,X C Lou, H J Lu,J G Lu,Y Lu,Y P Lu,C L Luo,M X Luo,T Luo,X L Luo, X R Lyu,F C Ma,H L Ma,L L Ma,M M Ma,Q M Ma,T Ma,X N Ma,X Y Ma,Y M Ma,F E Maas,M Maggiora,Q A Malik, Y J Mao, Z P Mao,S Marcello,J G Messchendorp,G Mezzadri,J Min,T J Min, R E Mitchell,X H Mo,Y J Mo,C Morales Morales, N Yu Muchnoi,H Muramatsu,P Musiol,Y Nefedov,F Nerling,I B Nikolaev,Z Ning,S Nisar,S L Niu,X Y Niu,S L Olsen,Q Ouyang,S Pacetti,Y Pan,P Patteri,M Pelizaeus, H P Peng,K Peters,J Pettersson,J L Ping, R G Ping,R Poling,V Prasad,H R Qi,M Qi,S Qian,C F Qiao,L Q Qin,N Qin,X S Qin,Z H Qin,J F Qiu,K H Rashid,C F Redmer, M Ripka,G Rong,Ch Rosner,X D Ruan,A Sarantsev,M Savrié,C Schnier,K Schoenning,S Schumann,W Shan,M Shao,C P Shen,P X Shen,X Y Shen, H Y Sheng,M Shi,W M Song,X Y Song, S Sosio,S Spataro,G X Sun,J F Sun,S S Sun,X H Sun,Y J Sun,Y Z Sun,Z J Sun,Z T Sun,C J Tang,X Tang,I Tapan, E H Thorndike,M Tiemens,I Uman,G S Varner,B Wang,B L Wang,D Wang, D Y Wang,K Wang,L L Wang,L S Wang,M Wang,P Wang,P L Wang,W Wang,W P Wang,X F Wang, Y Wang, Y D Wang,Y F Wang, Y Q Wang,Z Wang, Z G Wang, Z H Wang, Z Y Wang, Z Y Wang,T Weber,D H Wei,P Weidenkaff,S P Wen,U Wiedner,M Wolke,L H Wu,L J Wu,Z Wu,L Xia,L G Xia,Y Xia,D Xiao,H Xiao,Z J Xiao,Y G Xie,Q L Xiu,G F Xu,J J Xu,L Xu,Q J Xu,Q N Xu, X P Xu,L Yan,W B Yan,W C Yan,Y H Yan,H J Yang,H X Yang,L Yang,Y X Yang,M Ye,M H Ye,J H Yin,Z Y You,B X Yu,C X Yu,J S Yu,C Z Yuan,W L Yuan,Y Yuan, A Yuncu,A A Zafar,A Zallo,Y Zeng,Z Zeng,B X Zhang,B Y Zhang,C Zhang,C C Zhang, D H Zhang,H H Zhang, H Y Zhang,J Zhang, J J Zhang,J L Zhang, J Q Zhang,J W Zhang,J Y Zhang,J Z Zhang,K Zhang,L Zhang, S Q Zhang,X Y Zhang,Y Zhang,Y Zhang, Y H Zhang,Y N Zhang,Y T Zhang, Yu Zhang,Z H Zhang,Z P Zhang,Z Y Zhang,G Zhao,J W Zhao,J Y Zhao,J Z Zhao,Lei Zhao,Ling Zhao,M G Zhao,Q Zhao,Q W Zhao,S J Zhao,T C Zhao,Y B Zhao,Z G Zhao,A Zhemchugov,B Zheng,J P Zheng,W J Zheng,Y H Zheng,B Zhong,L Zhou,X Zhou,X K Zhou,X R Zhou,X Y Zhou,K Zhu,K J Zhu,S Zhu, S H Zhu,X L Zhu,Y C Zhu,Y S Zhu,Z A Zhu,J Zhuang,L Zotti,B S Zou, J H Zou

PHYSICAL REVIEW LETTERS（2018）

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摘要

Using a low background data sample of 9.7 x 10(5) J/psi -> gamma eta',eta' -> gamma pi(+)pi(-) events, which are 2 orders of magnitude larger than those from the previous experiments, recorded with the BESIII detector at BEPCII, the decay dynamics of eta' -> gamma pi(+)pi(-) are studied with both model-dependent and model-independent approaches. The contributions of. and the rho(770)-omega interference are observed for the first time in the decays eta' -> gamma pi(+)pi(-) in both approaches. Additionally, a contribution from the box anomaly or the rho(1450) resonance is required in the model-dependent approach, while the process specific part of the decay amplitude is determined in the model-independent approach.

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