First Evidence of ψ(3770) Hadronic Transition to J/ψπ<SUP>+</SUP>π<SUP>—</SUP>

BES Collaboration<BR>BAI Jing-Zhi; BAN Yong; BIAN Jian-Guo; CAI Xiao; CHANG Jin-Fan; CHEN Hai-Xuan; CHEN He-Sheng; CHEN Hong-Fang; CHEN Jiang-Chuan; CHEN Jin; CHEN Jun; CHEN Ma-Li; CHEN Yuan-Bo; CHI Shao-Peng; CHU Yuan-Ping; CUI Xiang-Zong; DAI Hong-Liang; DAI You-Shan; DENG Zi-Yan; DONG Liao-Yuan; DU Shu-Xian; DU Zhi-Z

Chinese Physics C> 2004, Vol. 28> Issue(4) : 325-331

First Evidence of ψ(3770) Hadronic Transition to J/ψπ⁺π^—

Institute of High Energy Physics,CAS,Beijing 100039,China1 Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China2 Department of Physics,Shandong University,Jinan 250100,China3 Department of Physics,Zhejiang University,Hangzhou 310028,China4 Department of Applied Physics,Shanghai Jiaotong University,Shanghai 200030,China5 School of Physics and Department of Technical Physics,Peking University,Beijing 100871,China6 Institute of Partcle Physics,Huazhong Normal University,Wuhan 430079,China7 China Center for Advanced Science and Technology CCAST,Beijing 100080,China8 School of Physics,Nankai University,Tianjin 300071,China9 School of Physics and Information Engineering,Henan Normal University,Xinxiang 453002,China10 School of Physics and Electric Information,Wuhan University,Wuhan 430072,China11 Department of Applied Physics,Hunan University,Changsha 410082,China12 Department of Physics,Liaoning University,Shenyang 110036,China13 Department of Physics,Sichuan University,Chengdu 610064,China14 Department of Physics,Tsinghua University,Beijing 100084,China15 Department of Physics Electric Science,Guangxi Normal University,Guilin 541004,China16 Department of Physics,Nanjing Normal University,Nanjing 210097,China

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Abstract：
Evidence of ψ(3770) decays to a non-DD final state is observed. A total of 6.8±3.0 ψ(3770)→J/ψ→π⁺π^— events are obtained from a data sample of 8.0±0.5 pb^-1 taken at center-of-mass energies around 3.773GeV using the BES-Ⅱ detector at the BEPC. The branching fraction is determined to be BF(ψ(3770)→J/ψ→π⁺π^—)=(0.59±0.26±0.16)%, corresponding to the partial width of Γ(ψ(3770)→J/ψπ⁺π^—)=(139±61±41)keV.

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BES Collaboration
BAI Jing-Zhi, BAN Yong, BIAN Jian-Guo, CAI Xiao, CHANG Jin-Fan, CHEN Hai-Xuan, CHEN He-Sheng, CHEN Hong-Fang, CHEN Jiang-Chuan, CHEN Jin, CHEN Jun, CHEN Ma-Li, CHEN Yuan-Bo, CHI Shao-Peng, CHU Yuan-Ping, CUI Xiang-Zong, DAI Hong-Liang, DAI You-Shan, DENG Zi-Yan, DONG Liao-Yuan, DU Shu-Xian and DU Zhi-Z. First Evidence of ψ(3770) Hadronic Transition to J/ψπ⁺π^—[J]. Chinese Physics C, 2004, 28(4): 325-331.

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Received: 2004-02-16
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

First Evidence of ψ(3770) Hadronic Transition to J/ψπ⁺π^—

Institute of High Energy Physics,CAS,Beijing 100039,China1 Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China2 Department of Physics,Shandong University,Jinan 250100,China3 Department of Physics,Zhejiang University,Hangzhou 310028,China4 Department of Applied Physics,Shanghai Jiaotong University,Shanghai 200030,China5 School of Physics and Department of Technical Physics,Peking University,Beijing 100871,China6 Institute of Partcle Physics,Huazhong Normal University,Wuhan 430079,China7 China Center for Advanced Science and Technology CCAST,Beijing 100080,China8 School of Physics,Nankai University,Tianjin 300071,China9 School of Physics and Information Engineering,Henan Normal University,Xinxiang 453002,China10 School of Physics and Electric Information,Wuhan University,Wuhan 430072,China11 Department of Applied Physics,Hunan University,Changsha 410082,China12 Department of Physics,Liaoning University,Shenyang 110036,China13 Department of Physics,Sichuan University,Chengdu 610064,China14 Department of Physics,Tsinghua University,Beijing 100084,China15 Department of Physics Electric Science,Guangxi Normal University,Guilin 541004,China16 Department of Physics,Nanjing Normal University,Nanjing 210097,China

Received Date: 2004-02-16

Accepted Date: 1900-01-01

Available Online: 2004-04-05

Abstract: Evidence of ψ(3770) decays to a non-DD final state is observed. A total of 6.8±3.0 ψ(3770)→J/ψ→π⁺π^— events are obtained from a data sample of 8.0±0.5 pb^-1 taken at center-of-mass energies around 3.773GeV using the BES-Ⅱ detector at the BEPC. The branching fraction is determined to be BF(ψ(3770)→J/ψ→π⁺π^—)=(0.59±0.26±0.16)%, corresponding to the partial width of Γ(ψ(3770)→J/ψπ⁺π^—)=(139±61±41)keV.

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First Evidence of ψ(3770) Hadronic Transition to J/ψπ⁺π^—

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First Evidence of ψ(3770) Hadronic Transition to J/ψπ⁺π^—