Measurements of h(c)(1P(1)) in psi' decays. Ablikim M , Achasov M N , An L , An Q , An Z H , Bai J Z , Ban Y , Berger N , Bian J M , Boyko I , Briere R A , Bytev V , Cai X , Cao G F , Cao X X , Chang J F , Chelkov G , Chen G , Chen H S , Chen J C , Chen L P , Chen M L , Chen P , Chen S J , Chen Y B , 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 , Duan M Y , Fang J , Feng C Q , Fu C D , Fu J L , Gao Y , Geng C , Goetzen K , Gong W X , Greco M , Grishin S , Gu Y T , Guo A Q , Guo L B , Guo Y P , Han S 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 , Hu X W , Huang B , Huang G M , Huang J S , Huang X T , Huang Y P , Ji C S , Ji Q , Ji X B , Ji X L , Jia L K , Jiang L L , Jiang X S , Jiao J B , Jin D P , Jin S , Komamiya S , Kuehn W , Lange S , Leung J K C , Li Cheng , Li Cui , Li D M , Li F , Li G , Li H B , Li J , Li J C , Li Lei , Li Lu , Li Q J , Li W D , Li W G , Li X L , Li X N , Li X Q , Li X R , Li Y X , Li Z B , Liang H , Liang T R , Liang Y T , Liang Y F , Liao G R , 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 M , Liu H W , Liu J , Liu J P , Liu K , Liu K Y , Liu Q , Liu S B , Liu X H , Liu Y B , Liu Y F , Liu Y W , Liu Yong , Liu Z A , Lu G R , 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 X , Ma X Y , Maggiora M , Mao Y J , Mao Z P , Min J , Mo X H , Muchnoi N Yu , Nefedov Y , Ning F P , Olsen S L , Ouyang Q , Pelizaeus M , Peters K , Ping J L , Ping R G , Poling R , Pun C S J , Qi M , Qian S , Qiao C F , Qiu J F , Rong G , Ruan X D , Sarantsev A , Shao M , Shen C P , Shen X Y , Sheng H 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 , Tang X F , Tian H L , Toth D , Varner G S , Wan X , Wang B Q , Wang J K , Wang K , Wang L L , Wang L S , Wang P , Wang P L , Wang Q , Wang S G , Wang X D , Wang X L , Wang Y D , Wang Y F , Wang Y Q , Wang Z , Wang Z G , Wang Z Y , Wei D H , Wen S P , Wiedner U , Wu L H , Wu N , Wu W , Wu Y M , Wu Z , Xiao Z J , Xie Y G , Xu G F , Xu G M , Xu H , Xu Min , Xu Ming , Xu X P , Xu Y , Xu Z Z , Xue Z , Yan L , Yan W B , Yan Y H , Yang H X , Yang M , Yang P , Yang S M , Yang Y X , Ye M , Ye M H , Yu B X , Yu C X , Yu L , Yuan C Z , Yuan Y , Zeng Y , Zhang B X , Zhang B Y , Zhang C C , Zhang D H , Zhang H H , Zhang H Y , Zhang J W , Zhang J Y , Zhang J Z , Zhang L , Zhang S H , Zhang X Y , Zhang Y , Zhang Y H , Zhang Z P , Zhao C , 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 , Zhemchugov A , Zheng B , Zheng J P , Zheng Y H , Zheng Z P , Zhong B , Zhong J , Zhou L , Zhou Z L , Zhu C , Zhu K , Zhu K J , Zhu Q M , Zhu X W , Zhu Y S , Zhu Z A , Zhuang J , Zou B S , Zou J H , Zuo J X , Zweber P , Null Null Physical review letters（2010）
摘要
We present measurements of the charmonium state h(c)(1P(1)) made with 106x10(6) psi' events collected by BESIII at BEPCII. Clear signals are observed for psi'-->pi0 h(c) with and without the subsequent radiative decay h(c)-->gamma eta(c). First measurements of the absolute branching ratios B(psi'-->pi0 h(c)) = (8.4+/-1.3+/-1.0) x 10(-4) and B(h(c)-->gamma eta(c)) = (54.3+/-6.7+/-5.2)% are presented. A statistics-limited determination of the previously unmeasured h(c) width leads to an upper limit Gamma(h(c))<1.44 MeV (90% confidence). Measurements of M(h(c)) = 3525.40+/-0.13+/-0.18 MeV/c2 and B(psi'-->pi0 h(c)) x B(h(c)-->gamma eta(c)) = (4.58+/-0.40+/-0.50) x 10(-4) are consistent with previous results.
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