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First Measurements of eta_c Decaying into K^+K^-2(pi^+pi^-) and 3(pi^+pi^-)

M Ablikim, J Z Bai, Y Ban, J G Bian, X Cai, J F Chang, H F Chen, H F Chen, H F Chen, J C Chen, Chen Jin, Chen Jun, M L Chen, Y B Chen, S P Chi, Y P Chu, X Z Cui, H L Dai, Y S Dai, Z Y Deng, L Y Dong, Q F Dong, S X Du, Z Z Du, J Fang, S S Fang, C D Fu, H Y Fu, C S Gao, Y N Gao, M Y Gong, W X Gong, S D Gu, Y N Guo, Y N Guo, Z J Guo, F A Harris, K L He, M He, X He, Y K Heng, H M Hu, T Hu, G S Huang, X P Huang, X P Huang, X B Ji, C H Jiang, X S Jiang, D P Jin, S Jin, Y Jin, Yi Jin, Y F Lai, F Li, G Li, H H Li, J C Li, J C Li, Q J Li, R Y Li, S M Li, W G Li, W G Li, X Q Li, X Q Li, Y L Li, Y F Liang, H B Liao, C X Liu, F Liu, Fang Liu, H M Liu, H M Liu, J B Liu, J B Liu, J B Liu, R G Liu, Z X Liu, Z X Liu, F Lu, G R Lu, H J Lu, J G Lu, C L Luo, L X Luo, X L Luo, F C Ma, H L Ma, J M Ma, L L Ma, Q M Ma, X Y Ma, X Y Ma, Z P Mao, X H Mo, J Nie, Z D Nie, S L Olsen, H P Peng, N D Qi, C D Qian, H Qin, J F Qiu, Z Y Ren, G Rong, L Y Shan, L Shang, D L Shen, X Y Shen, H Y Sheng, F Shi, X Shi, H S Sun, J F Sun, S S Sun, Y Z Sun, Z J Sun, X Tang, N Tao, Y R Tian, G L Tong, G S Varner, D Y Wang, J Z Wang, K Wang, L S Wang, L S Wang, M Wang, P L Wang, P L Wang, S Z Wang, W F Wang, Y F Wang, Z Y Wang, Z Y Wang, Zhe Wand, Zheng Wang, C L Wei, D H Wei, N Wu, Y M Wu, X M Xia, X X Xie, B Xin, G F Xu, H Xu, S T Xue, M L Yan, F Yang, H X Yang, J Yang, Y X Yang, M H Ye, M H Ye, Y X Ye, L H Yi, Z Y Yi, C S Yu, G W Yu, C Z Yuan, J M Yuan, Y Yuan, S L Zang, Y Zeng, Yu Zeng, B X Zhang, B X Zhang, C C Zhang, D H Zhang, H Y Zhang, J W Zhang, J W Zhang, J W Zhang, Q J Zhang, S Q Zhang, X Y Zhang, X Y Zhang, Y Y Zhang, Yiyun Zahng, Z P Zhang, Z P Zhang, D X Zhao, J B Zhao, J B Zhao, M G Zhao, P P Zhao, W R Zhao, X J Zhao, Y B Zhao, Z G Zhao, H Q Zheng, J P Zheng, L S Zheng, Z P Zheng, X C Zhong, B Q Zhou, G M Zhou, L Zhou, N F Zhou, K J Zhu, Q M Zhu, Y S Zhu, Y S Zhu, Yingchun Zhu, Z A Zhu, B A Zhuang, X A Zhuang, B S Zou

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Abstract

The decays of eta_c to K^+K^-2(pi^+pi^-) and 3(pi^+pi^-) are observed for the first time using a sample of 5.8X10^7 J/\\psi events collected by the BESII detector. The product branching fractions are determined to be B(J/\\psi-->gamma eta_c)*B(eta_c-->K^+K^-pi^+pi^-pi^+pi^-)=(1.21+-0.32+- 0.23)X10^{-4}$,B(J/\\psi-->gamma eta_c)*B(eta_c-->K^{*0}\\bar{K}^{*0}pi^+pi^-)= (1.29+-0.43+-0.32)X10^{-4}$, and (J/\\psi-->gamma eta_c)* B(eta_c-->pi^+pi^-pi^+pi^-pi^+pi^-)= (2.59+-0.32+-0.48)X10^{-4}. The upper limit for eta_c-->phi pi^+pi^-pi^+pi^- is also obtained as B(J/\\psi-->gamma eta_c)*B(eta_c--> phi pi^+pi^-pi^+pi^-)< 6.03 X10^{-5} at the 90% confidence level.

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What this paper is about

The decays of eta_c to K^+K^-2(pi^+pi^-) and 3(pi^+pi^-) are observed for the first time using a sample of 5.8X10^7 J/\\psi events collected by the BESII detector. The product branching fractions are determined to be B(J/\\psi-->gamma eta_c)*B(eta_c-->K^+K^-pi^+pi^-pi^+pi^-)=(1.21+-0.32+- 0.23)X10^{-4}$,B(J/\\psi-->gamma eta_c)*B(eta_c-->K^{*0}\\bar{K}^{*0}pi^+pi^-)= (1.29+-0.43+-0.32)X10^{-4}$, and (J/\\psi-->gamma eta_c)* B(eta_c-->pi^+pi^-pi^+pi^-pi^+pi^-)= (2.59+-0.32+-0.48)X10^{-4}. The upper limit for eta_c-->phi pi^+pi^-pi^+pi^- is also obtained as B(J/\\psi-->gamma eta_c)*B(eta_c--> phi pi^+pi^-pi^+pi^-)< 6.03 X10^{-5} at the 90% confidence level.

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Available abstract

The decays of eta_c to K^+K^-2(pi^+pi^-) and 3(pi^+pi^-) are observed for the first time using a sample of 5.8X10^7 J/\\psi events collected by the BESII detector. The product branching fractions are determined to be B(J/\\psi-->gamma eta_c)*B(eta_c-->K^+K^-pi^+pi^-pi^+pi^-)=(1.21+-0.32+- 0.23)X10^{-4}$,B(J/\\psi-->gamma eta_c)*B(eta_c-->K^{*0}\\bar{K}^{*0}pi^+pi^-)= (1.29+-0.43+-0.32)X10^{-4}$, and (J/\\psi-->gamma eta_c)* B(eta_c-->pi^+pi^-pi^+pi^-pi^+pi^-)= (2.59+-0.32+-0.48)X10^{-4}. The upper limit for eta_c-->phi pi^+pi^-pi^+pi^- is also obtained as B(J/\\psi-->gamma eta_c)*B(eta_c--> phi pi^+pi^-pi^+pi^-)< 6.03 X10^{-5} at the 90% confidence level.

Key concepts: Pi, Physics, Chemistry, Biochemistry

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