Observation of the ψ(1 3D2) State in e+e-→π+π-γχc1 at BESIII.

M Ablikim,M N Achasov,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,M Bertani,D Bettoni,J M Bian,F Bianchi,E Boger,O Bondarenko,I Boyko,R A Briere,H Cai,X Cai,O Cakir,A Calcaterra,G F Cao,S A Cetin,J F Chang,G Chelkov,G Chen,H S Chen,H Y Chen,J C Chen,M L Chen,S J Chen,X Chen,X R Chen,Y B Chen,H P Cheng,X K Chu,G Cibinetto,D Cronin-Hennessy,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,S X Du,P F Duan,J Z Fan,J Fang,S S Fang,X Fang,Y Fang,L Fava,F Feldbauer,G Felici,C Q Feng,E Fioravanti,M Fritsch,C D Fu,Q Gao,Y Gao,Z Gao,I Garzia,C Geng,K Goetzen,W X Gong,W Gradl,M Greco,M H Gu,Y T Gu,Y H Guan,A Q Guo,L B Guo,Y Guo,Y P Guo,Z Haddadi,A Hafner,S Han,Y L Han,X Q Hao,F A Harris,K L He,Z Y He,T Held,Y K Heng,Z L Hou,C Hu,H M Hu,J F Hu,T Hu,Y Hu,G M Huang,G S Huang,H P Huang,J S Huang,X T Huang,Y Huang,T Hussain,Q Ji,Q P Ji,X B Ji,X L Ji,L L Jiang,L W Jiang,X S 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,R Kliemt,B Kloss,O B Kolcu,B Kopf,M Kornicer,W Kuehn,A Kupsc,W Lai,J S Lange,M Lara,P Larin,C Leng,C H Li,Cheng Li,D M Li,F Li,G Li,H B Li,J C Li,Jin Li,K Li,K Li,Lei Li,P R Li,T Li,W D Li,W G Li,X L Li,X M Li,X N Li,X Q Li,Z B Li,H Liang,Y F Liang,Y T Liang,G R Liao,D X Lin,B J Liu,C X Liu,F H Liu,Fang Liu,Feng Liu,H B Liu,H H Liu,H H Liu,H M Liu,J 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,X X Liu,Y B Liu,Z A Liu,Zhiqiang Liu,Zhiqing Liu,H Loehner,X C Lou,H J Lu,J G Lu,R Q Lu,Y Lu,Y P Lu,C L Luo,M X Luo,T Luo,X L Luo,M Lv,X R Lyu,F C Ma,H L Ma,L L Ma,Q M Ma,S Ma,T Ma,X N Ma,X Y Ma,F E Maas,M Maggiora,Q A Malik,Y J Mao,Z P Mao,S Marcello,J G Messchendorp,J Min,T J Min,R E Mitchell,X H Mo,Y J Mo,C Morales Morales,K Moriya,N Yu Muchnoi,H Muramatsu,Y Nefedov,F Nerling,I B Nikolaev,Z Ning,S Nisar,S L Niu,X Y Niu,S L Olsen,Q Ouyang,S Pacetti,P Patteri,M Pelizaeus,H P Peng,K Peters,J Pettersson,J L Ping,R G Ping,R Poling,Y N Pu,M Qi,S Qian,C F Qiao,L Q Qin,N Qin,X S Qin,Y Qin,Z H Qin,J F Qiu,K H Rashid,C F Redmer,H L Ren,M Ripka,G Rong,X D Ruan,V Santoro,A Sarantsev,M Savrié,K Schoenning,S Schumann,W Shan,M Shao,C P Shen,P X Shen,X Y Shen,H Y Sheng,W M Song,X Y Song,S Sosio,S Spataro,G X Sun,J F Sun,S S 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,D Toth,M Ullrich,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,Q J Wang,S G Wang,W Wang,X F Wang,Y D Wang,Y F Wang,Y Q Wang,Z Wang,Z G Wang,Z H Wang,Z Y Wang,T Weber,D H Wei,J B Wei,P Weidenkaff,S P Wen,U Wiedner,M Wolke,L H Wu,Z Wu,L G Xia,Y Xia,D Xiao,Z J Xiao,Y G Xie,Q L Xiu,G F Xu,L Xu,Q J Xu,Q N Xu,X P Xu,L Yan,W B Yan,W C Yan,Y H Yan,H X Yang,L Yang,Y Yang,Y X Yang,H Ye,M Ye,M H Ye,J H Yin,B X Yu,C X Yu,H W Yu,J S Yu,C Z Yuan,W L Yuan,Y Yuan,A Yuncu,A A Zafar,A Zallo,Y Zeng,B X Zhang,B Y Zhang,C Zhang,C C Zhang,D H Zhang,H H Zhang,H Y Zhang,J J Zhang,J L Zhang,J Q Zhang,J W Zhang,J Y Zhang,J Z Zhang,K Zhang,L Zhang,S H Zhang,X Y Zhang,Y Zhang,Y H Zhang,Y T 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,Li Zhou,X Zhou,X K Zhou,X R Zhou,X Y Zhou,K Zhu,K J Zhu,S 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（2015）

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摘要

We report the observation of the X(3823) state in the process e+e-→π+π-X(3823)→π+π-γχc1 with a statistical significance of 6.2σ, in data samples at center-of-mass energies sqrt[s]=4.230, 4.260, 4.360, 4.420, and 4.600 GeV collected with the BESIII detector at the BEPCII electron positron collider. The measured mass of the X(3823) state is (3821.7±1.3±0.7) MeV/c2, where the first error is statistical and the second systematic, and the width is less than 16 MeV at the 90% confidence level. The products of the Born cross sections for e+e-→π+π-X(3823) and the branching ratio B[X(3823)→γχc1,c2] are also measured. These measurements are in good agreement with the assignment of the X(3823) state as the ψ(1 3D2) charmonium state.

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