[1]Institute of High Energy Physics Chinese Academy of Science,Beijing,China
[2]Budker Institute of Nuclear Physics of the Siberian Branch of the RAS,Novosibirsk,Russian Federation
[3]Ecole Polytechnique Federale de Lausanne, Institute of Physics,Lausanne,Switzerland
[4]University of Science and Technology of China, State Key Laboratory of Particle Detection and Electronics,Hefei,China
[5]Peking University, State Key Laboratory of Nuclear Physics and Technology,Beijing,China
[6]Universite Savoie Mont Blanc,Chambery,France
[7]University of Minnesota Twin Cities,Minneapolis,United States
[8]Joint Institute for Nuclear Research, Dubna,Dubna,Russian Federation
[9]Carnegie Mellon University,Pittsburgh,United States
[10]Universitat Hamburg, Institute of Theoretical Physics,Hamburg,Germany
[11]State Key Laboratory of Particle Detection and Electronics,Beijing,China
[12]Beijing Engineering Research Center of Radiographic Techniques and Equipment,Beijing,China
[13]University of South China,Hengyang,China
[14]University of Manchester, School of Physics and Astronomy,Manchester,United Kingdom
[15]California Institute of Technology,Pasadena,United States
[16]University of Minnesota Twin Cities, School of Physics and Astronomy,Minneapolis,United States
[17]Shanghai Jiaotong University,Shanghai,China
[18]Universita degli Studi di Torino,Torino,Italy
[19]Liaoning University,Shenyang,China
[20]Zhengzhou University,Zhengzhou,China
[21]Shanxi University, Institute of Theoretical Physics,Taiyuan,China
[22]University of Science and Technology of China,Hefei,China
[23]Istituto Nazionale Di Fisica Nucleare, Frascati,Frascati,Italy
[24]Tsinghua University, Center for High Energy Physics,Beijing,China
[25]GSI Helmholtz Centre for Heavy Ion Research GmbH,Darmstadt,Germany
[26]Saratov State University, Laboratory Metamaterials,Saratov,Russian Federation
[27]Guangxi University,Nanning,China
[28]Nanjing Normal University,Nanjing,China
[29]Wuhan University,Wuhan,China
[30]University of Hawaii at Manoa,Honolulu,United States
[31]Nankai University,Tianjin,China
[32]Nanjing University, School of Information Management,Nanjing,China
[33]Huazhong Normal University,Wuhan,China
[34]University of Texas at Austin, Department of Physics,Austin,United States
[35]Nanjing University,Nanjing,China
[36]Shandong University,Jinan,China
[37]University of Tokyo, Department of Physics,Tokyo,Japan
[38]Justus Liebig University Giessen, Institute of Physics,Giessen,Germany
[39]Justus Liebig University Giessen, II. Phys. Inst.,Giessen,Germany
[40]The University of Hong Kong,Pokfulam,Hong Kong
[41]Uppsala Universitet,Uppsala,Sweden
[42]Institute of Semiconductors Chinese Academy of Sciences, Optoelectronic System Laboratory,Beijing,China
[43]Chinese Academy of Sciences, State Key Laboratory of Geomechanics and Geotechnical Engineering,Beijing,China
[44]Duke University, Department of Physics,Durham,United States
[45]an Institute of Posts and Telecommunications, School of Sciences,Xian,China
[46]Dalian University of Technology, School of Electrical Engineering,Dalian,China
[47]China Institute of Atomic Energy,Beijing,China
[48]Princeton University, Department of Physics,Princeton,United States
[49]Zhengzhou University, School of Physics and Engineering,Zhengzhou,China
[50]Sun Yat-Sen University,Guangzhou,China
[51]Inner Mongolia University for the Nationalities, College of Physics and Electronic Information,Tongliao,China
[52]Sichuan University,Chengdu,China
[53]Guangxi Normal University,Guilin,China
[54]Anhui University of Science and Technology, School of Geodesy and Geomatics,Huainan,China
[55]Shanxi University,Taiyuan,China
[56]Shanxi University, Institute of Applied Chemistry,Taiyuan,China
[57]Brookhaven National Laboratory, Department of Physics,Upton,United States
[58]Macau University of Science and Technology, Faculty of Information Technology,Taipa,Macao
[59]Tsinghua University,Beijing,China
[60]Chinese Academy of Sciences,Beijing,China
[61]Lanzhou University,Lanzhou,China
[62]Stanford University,Palo Alto,United States
[63]University of Alabama,Tuscaloosa,United States
[64]Henan Normal University, Institute of Particle and Nuclear Physics,Xinxiang,China
[65]Fermi National Accelerator Laboratory,Batavia,United States
[66]Zhejiang University,Hangzhou,China
[67]Liaoning University, Department of Chemistry,Shenyang,China
[68]Vanderbilt University,Nashville,United States
[69]Seoul National University,Seoul,South Korea
[70]Ruhr-Universitat Bochum,Bochum,Germany
[71]The University of Hong Kong, Department of Physics,Pokfulam,Hong Kong
[72]Universitat Bonn, Helmholtz-Institut für Strahlen- und Kernphysik,Bonn,Germany
[73]Beihang University,Beijing,China
[74]University of Tokyo,Tokyo,Japan
[75]Johannes Gutenberg Universitat Mainz,Mainz,Germany
[76]Henan Normal University, College of Physics and Electronic Engineering,Xinxiang,China
[77]Indiana University,Bloomington,United States
[78]University of Minnesota System,,United States
[79]National Taiwan University,Taipei,Taiwan
[80]Chengdu Institute of Organic Chemistry Chinese Academy of Sciences,Chengdu,China
[81]University of Chinese Academy of Sciences, College of Physical Sciences,Beijing,China
[82]McGill University, Department of Physics,Montreal,Canada
[83]Zhejiang University, Department of Biomedical Engineering,Hangzhou,China
[84]University of Florida,Gainesville,United States
[85]Helmholtz Institute Mainz,Mainz,Germany
[86]Soochow University,Suzhou,China
[87]Fudan University, Department of Environmental Science and Engineering,Shanghai,China
[88]Texas Tech University at Lubbock,Lubbock,United States
[89]East China Normal University, Department of Mathematics,Shanghai,China
[90]Institute of Plasma Physics Chinese Academy of Sciences,Hefei,China
[91]Nanjing Normal University, Department of Physics,Nanjing,China
[92]Huazhong Normal University, Institute of Particle Physics,Wuhan,China
[93]Peking University,Beijing,China
[94]East China Normal University, Department of Chemistry,Shanghai,China
[95]Shanghai Jiaotong University, School of Mechanical Engineering,Shanghai,China
[96]Jiangxi University of Science and Technology, College of Applied Science,Ganzhou,China
[97]Ecole Polytechnique Federale de Lausanne,Lausanne,Switzerland
[98]University of Science and Technology of China, Department of Chemical Physics,Hefei,China
[99]Hunan University,Changsha,China
[100]University of Shanghai for Science and Technology, School of Energy and Power Engineering,Shanghai,China
[101]China Academy of Engineering Physics, Institute of Chemical Materials,Chengdu,China
[102]Universitetet i Bergen, Department of Physics and Technology,Bergen,Norway
[103]China Center of Advanced Science and Technology World Laboratory,Beijing,China
[104]Wuhan Electric Power Technical College,Wuhan,China
[105]Hunan University, School of Physics and Microelectronics Science,Changsha,China
[106]University of California, San Francisco, Department of Medicine,San Francisco,United States
[107]Chongqing University,Chongqing,China
[108]Shanghai Institute of Applied Physics, Chinese Academy of Sciences,Shanghai,China
[109]Huashan Hospital, Department of Neurosurgery,Shanghai,China
[110]Peking University, School of Physics,Beijing,China
[111]University of Science and Technology of China, Department of Modern Physics,Hefei,China
[112]Sichuan University, Department of Periodontics,Chengdu,China
[113]Tianjin University, School of Environmental Science and Engineering,Tianjin,China
[114]Faculdade de Ciencias e Tecnologia, New University of Lisbon, Dep Fisica,Caparica,Portugal
[115]Institute of High Energy Physics Chinese Academy of Science, Experimental Physics Division,Beijing,China
We present measurements of the charmonium state hc(P11) made with 106×106 ψ′ events collected by BESIII at BEPCII. Clear signals are observed for ψ′→π0hc with and without the subsequent radiative decay hc→γηc. First measurements of the absolute branching ratios B(ψ′→π0hc)=(8. 4±1.3±1.0)×10-4 and B(hc→γηc)=(54. 3±6.7±5.2)% are presented. A statistics-limited determination of the previously unmeasured hc width leads to an upper limit Γ(hc)<1. 44MeV (90% confidence). Measurements of M(hc)=3525.40±0.13±0. 18MeV/c2 and B(ψ′→π0hc) ×B(hc→γηc)=(4.58±0.40±0.50)×10 -4 are consistent with previous results. ? 2010 The American Physical Society.
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