ηπ+ π- resonant structure around 1.8 GeV/c(2) and η(1405) in J/ψ → ωηπ+ π-. Ablikim M , Achasov M N , Alberto D , An Q , An Z H , Bai J Z , Baldini R , Ban Y , Becker J , Berger N , Bertani M , Bian J M , Bondarenko O , Boyko I , Briere R A , Bytev V , Cai X , Calcaterra A C , Cao G F , Cao X X , Chang J F , Chelkov G , Chen G , Chen H S , Chen J C , Chen M L , Chen S J , Chen Y , Chen Y B , Cheng H P , Chu Y P , Cronin-Hennessy D , Dai H L , Dai J P , Dedovich D , Deng Z Y , Denysenko I , Destefanis M , Ding Y , Dong L Y , Dong M Y , Du S X , Fan R R , Fang J , Fang S S , Feng C Q , Fu C D , Fu J L , Gao Y , Geng C , Goetzen K , Gong W X , Greco M , Grishin S , Gu M H , Gu Y T , Guan Y H , Guo A Q , Guo L B , Guo Y P , Hao X Q , Harris F A , He K L , He M , He Z Y , Heng Y K , Hou Z L , Hu H M , Hu J F , Hu T , Huang B , Huang G M , Huang J S , Huang X T , Huang Y P , Hussain T , Ji C S , Ji Q , Ji X B , Ji X L , Jia L K , Jiang L L , Jiang X S , Jiao J B , Jiao Z , Jin D P , Jin S , Jing F F , Kalantar-Nayestanaki N , Kavatsyuk M , Komamiya S , Kuehn W , Lange J S , Leung J K C , Li Cheng , Li Cui , Li D M , Li F , Li G , Li H B , Li J C , Li K , Li Lei , Li N B , Li Q J , Li W D , Li W G , Li X L , Li X N , Li X Q , Li X R , Li Z B , Liang H , Liang Y F , Liang Y T , Liao X T , Liu B J , Liu C L , Liu C X , Liu C Y , Liu F H , Liu Fang , Liu Feng , Liu G C , Liu H , Liu H B , Liu H H , Liu H M , Liu H W , Liu J P , Liu K , Liu K Y , Liu Q , Liu S B , Liu X , Liu X H , Liu Y B , Liu Y W , Liu Yong , Liu Z A , Liu Z Q , Loehner H , Lu G R , Lu H J , Lu J G , Lu Q W , Lu X R , Lu Y P , Luo C L , Luo M X , Luo T , Luo X L , Ma C L , Ma F C , Ma H L , Ma Q M , Ma T , Ma X , Ma X Y , Maggiora M , Malik Q A , Mao H , Mao Y J , Mao Z P , Messchendorp J G , Min J , Mitchell R E , Mo X H , Muchnoi N Yu , Nefedov Y , Nikolaev I B , Ning Z , Olsen S L , Ouyang Q , Pacetti S , Pelizaeus M , Peters K , Ping J L , Ping R G , Poling R , Pun C S J , Qi M , Qian S , Qiao C F , Qin X S , Qiu J F , Rashid K H , Rong G , Ruan X D , Sarantsev A , Schulze J , Shao M , Shen C P , Shen X Y , Sheng H Y , Shepherd M R , Song X Y , Sonoda S , Spataro S , Spruck B , Sun D H , Sun G X , Sun J F , Sun S S , Sun X D , Sun Y J , Sun Y Z , Sun Z J , Sun Z T , Tang C J , Tang X , Tian H L , Toth D , Varner G S , Wan X , Wang B Q , Wang K , Wang L L , Wang L S , Wang M , Wang P , Wang P L , Wang Q , Wang S G , Wang X L , Wang Y D , Wang Y F , Wang Y Q , Wang Z , Wang Z G , Wang Z Y , Wei D H , Wen Q G , Wen S P , Wiedner U , Wu L H , Wu N , Wu W , Wu Z , Xiao Z J , Xie Y G , Xu G F , Xu G M , Xu H , Xu Q J , Xu X P , Xu Y , Xu Z R , Xu Z Z , Xue Z , Yan L , Yan W B , Yan Y H , Yang H X , Yang M , Yang T , Yang Y , Yang Y X , Ye M , Ye M H , Yu B X , Yu C X , Yu L , Yu S P Yu , Yuan C Z , Yuan W L , Yuan Y , Zafar A A , Zallo A , Zeng Y , Zhang B X , Zhang B Y , Zhang C C , Zhang D H , Zhang H H , Zhang H Y , Zhang J , Zhang J W , Zhang J Y , Zhang J Z , Zhang L , Zhang S H , Zhang T R , Zhang X J , Zhang X Y , Zhang Y , Zhang Y H , Zhang Z P , Zhang Z Y , Zhao G , Zhao H S , Zhao Jiawei , Zhao Jingwei , Zhao Lei , Zhao Ling , Zhao M G , Zhao Q , Zhao S J , Zhao T C , Zhao X H , Zhao Y B , Zhao Z G , Zhao Z L , Zhemchugov A , Zheng B , Zheng J P , Zheng Y H , Zheng Z P , Zhong B , Zhong J , Zhong L , Zhou L , Zhou X K , Zhou X R , Zhu C , Zhu K , Zhu K J , Zhu S H , Zhu X L , Zhu X W , Zhu Y S , Zhu Z A , Zhuang J , Zou B S , Zou J H , Zuo J X , Null Null Physical review letters（2011）
摘要
We present results of a study of the decay J/ψ → ωηπ+ π- using a sample of (225.2 ± 2.8) × 10(6) J/ψ events collected by the BESIII detector, and report the observation of a new process J/ψ → ωX(1870) with a statistical significance of 7.2σ, in which X(1870) decays to a(0)(±)(980)π±. Fitting to ηπ+ π- mass spectrum yields a mass M = 1877.3 ± 6.3(stat)(-7.4)(+3.4)(syst) MeV/c(2), a width Γ = 57 ± 12(stat)(-4)(+19)(syst) MeV/c(2), and a product branching fraction B(J/ψ → ωX) × B(X→a(0)(±)(980)π±) × B(a(0) (±)(980) → ηπ±) = [1.50 ± 0.26(stat)(-0.36)(+0.72) (syst)] × 10(-4). Signals for J/ψ → ωf(1)(1285) and J/ψ → ω η(1405) are also clearly observed and measured.
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