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. 2012 Jul 27;109(4):042003.
doi: 10.1103/PhysRevLett.109.042003. Epub 2012 Jul 24.

First observation of the M1 transition ψ(3686)→γη(c)(2S)

M Ablikim  1 , M N Achasov, D J Ambrose, F F An, Q An, Z H An, J Z Bai, Y Ban, J Becker, N Berger, M Bertani, J M Bian, E Boger, O Bondarenko, I Boyko, R A Briere, V Bytev, X Cai, A Calcaterra, G F Cao, J F Chang, G Chelkov, G Chen, H S Chen, J C Chen, M L Chen, S J Chen, Y Chen, Y B Chen, H P Cheng, Y P Chu, D Cronin-Hennessy, H L Dai, J P Dai, D Dedovich, Z Y Deng, A Denig, I Denysenko, M Destefanis, W M Ding, Y Ding, L Y Dong, M Y Dong, S X Du, J Fang, S S Fang, L Fava, F Feldbauer, C Q Feng, R B Ferroli, C D Fu, J L Fu, Y Gao, 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 P Guo, Y L Han, X Q Hao, F A Harris, K L He, M He, Z Y He, T Held, Y K Heng, Z L Hou, H M Hu, J F Hu, T Hu, B Huang, G M Huang, J S Huang, X T Huang, Y P Huang, T Hussain, C S Ji, Q Ji, X B Ji, X L Ji, L K Jia, L L Jiang, X S Jiang, J B Jiao, Z Jiao, D P Jin, S Jin, F F Jing, N Kalantar-Nayestanaki, M Kavatsyuk, W Kuehn, W Lai, J S Lange, J K C Leung, C H 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, S L Li, W D Li, W G Li, X L Li, X N Li, X Q Li, X R Li, Z B Li, H Liang, Y F Liang, Y T Liang, G R Liao, X T Liao, B J Liu, B J Liu, C L Liu, C X Liu, C Y Liu, F H Liu, Fang Liu, Feng Liu, H Liu, H B Liu, H H Liu, H M Liu, H W Liu, J P Liu, K Y Liu, Kai Liu, Kun Liu, P L Liu, S B Liu, X Liu, X H Liu, Y Liu, Y B Liu, Z A Liu, Zhiqiang Liu, Zhiqing Liu, H Loehner, G R Lu, H J Lu, J G Lu, Q W Lu, X R Lu, Y P Lu, C L Luo, M X Luo, T Luo, X L Luo, M Lv, C L Ma, F C Ma, H L Ma, Q M Ma, S Ma, T Ma, X Y Ma, Y Ma, F E Maas, M Maggiora, Q A Malik, H Mao, Y J Mao, Z P Mao, J G Messchendorp, J Min, T J Min, R E Mitchell, X H Mo, C Morales Morales, C Motzko, N Yu Muchnoi, Y Nefedov, C Nicholson, I B Nikolaev, Z Ning, S L Olsen, Q Ouyang, S Pacetti, J W Park, M Pelizaeus, H P Peng, K Peters, J L Ping, R G Ping, R Poling, E Prencipe, C S J Pun, M Qi, S Qian, C F Qiao, X S Qin, Y Qin, Z H Qin, J F Qiu, K H Rashid, G Rong, X D Ruan, A Sarantsev, B D Schaefer, J Schulze, M Shao, C P Shen, X Y Shen, H Y Sheng, M R Shepherd, X Y Song, S Spataro, B Spruck, 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 Sun, C J Tang, X Tang, E H Thorndike, H L Tian, D Toth, M Ullrich, G S Varner, B Wang, B Q Wang, K Wang, L L Wang, L S Wang, M Wang, P Wang, P L Wang, Q Wang, Q J Wang, S G Wang, X F Wang, X L Wang, Y D Wang, Y F Wang, Y Q Wang, Z Wang, Z G Wang, Z Y Wang, D H Wei, P Weidenkaff, Q G Wen, S P Wen, M Werner, U Wiedner, L H Wu, N Wu, S X Wu, W Wu, Z Wu, L G Xia, Z J Xiao, Y G Xie, Q L Xiu, G F Xu, G M Xu, H Xu, Q J Xu, X P Xu, Y Xu, Z R Xu, F Xue, Z Xue, L Yan, W B Yan, Y H Yan, H X Yang, T Yang, Y Yang, Y X Yang, H Ye, M Ye, M H Ye, B X Yu, C X Yu, J S Yu, L Yu, S P Yu, C Z Yuan, W L Yuan, Y Yuan, A A Zafar, A Zallo, Y Zeng, B X Zhang, B Y Zhang, C C Zhang, D H Zhang, H H Zhang, H Y Zhang, J Zhang, J G Zhang, J Q 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, Y S Zhang, Z P Zhang, Z Y Zhang, G Zhao, H S Zhao, J W Zhao, K X 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, A Zhemchugov, B Zheng, J P Zheng, Y H Zheng, Z P Zheng, B Zhong, J Zhong, L Zhou, X K Zhou, X R Zhou, C Zhu, K Zhu, K J Zhu, S H Zhu, X L Zhu, X W Zhu, Y M Zhu, Y S Zhu, Z A Zhu, J Zhuang, B S Zou, J H Zou, J X Zuo; BESIII Collaboration
Affiliations
Free article

First observation of the M1 transition ψ(3686)→γη(c)(2S)

M Ablikim et al. Phys Rev Lett. .
Free article

Abstract

Using a sample of 106×10(6) ψ(3686) events collected with the BESIII detector at the BEPCII storage ring, we have made the first measurement of the M1 transition between the radially excited charmonium S-wave spin-triplet and the radially excited S-wave spin-singlet states: ψ(3686)→γη(c)(2S). Analyses of the processes ψ(3686)→γη(c)(2S) with η(c)(2S)→K(S)(0)K(±)π(∓) and K(+)K(-)π(0) give an η(c)(2S) signal with a statistical significance of greater than 10 standard deviations under a wide range of assumptions about the signal and background properties. The data are used to obtain measurements of the η(c)(2S) mass (M(η(c)(2S))=3637.6±2.9(stat)±1.6(syst) MeV/c(2)), width (Γ(η(c)(2S))=16.9±6.4(stat)±4.8(syst) MeV), and the product branching-fraction (B(ψ(3686)→γη(c)(2S))×B(η(c)(2S)→KKπ)=(1.30±0.20(stat)±0.30(syst))×10(-5)). Combining our result with a BABAR measurement of B(η(c)(2S)→KKπ), we find the branching fraction of the M1 transition to be B(ψ(3686)→γη(c)(2S))=(6.8±1.1(stat)±4.5(syst))×10(-4).

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