[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]LNF-INFN,,Italy
[6]Peking University, State Key Laboratory of Nuclear Physics and Technology,Beijing,China
[7]Ruhr-Universitat Bochum,Bochum,Germany
[8]Universite Savoie Mont Blanc,Chambery,France
[9]Laboratori Nazionali di Frascati di INFN,Frascati,Italy
[10]University of Minnesota Twin Cities,Minneapolis,United States
[11]Joint Institute for Nuclear Research, Dubna,Dubna,Russian Federation
[12]Carnegie Mellon University,Pittsburgh,United States
[13]Universitat Hamburg, Institute of Theoretical Physics,Hamburg,Germany
[14]State Key Laboratory of Particle Detection and Electronics,Beijing,China
[15]Beijing Engineering Research Center of Radiographic Techniques and Equipment,Beijing,China
[16]University of Manchester, School of Physics and Astronomy,Manchester,United Kingdom
[17]Huangshan College,,China
[18]University of Minnesota Twin Cities, School of Physics and Astronomy,Minneapolis,United States
[19]Shanghai Jiaotong University,Shanghai,China
[20]Universita degli Studi di Torino,Torino,Italy
[21]Liaoning University,Shenyang,China
[22]Zhengzhou University,Zhengzhou,China
[23]Shanxi University, Institute of Theoretical Physics,Taiyuan,China
[24]Johannes Gutenberg Universitat Mainz,Mainz,Germany
[25]University of Science and Technology of China,Hefei,China
[26]Istituto Nazionale Di Fisica Nucleare, Frascati,Frascati,Italy
[27]Tsinghua University, Center for High Energy Physics,Beijing,China
[28]GSI Helmholtz Centre for Heavy Ion Research GmbH,Darmstadt,Germany
[29]Saratov State University, Laboratory Metamaterials,Saratov,Russian Federation
[30]Guangxi University,Nanning,China
[31]Nanjing Normal University,Nanjing,China
[32]Henan Normal University,Xinxiang,China
[33]University of Hawaii at Manoa,Honolulu,United States
[34]Nankai University,Tianjin,China
[35]Huazhong Normal University,Wuhan,China
[36]University of Texas at Austin, Department of Physics,Austin,United States
[37]Nanjing University,Nanjing,China
[38]University of the Punjab Lahore,Lahore,Pakistan
[39]Shandong University,Jinan,China
[40]
[41]University of Tokyo, Department of Physics,Tokyo,Japan
[42]Justus Liebig University Giessen, Institute of Physics,Giessen,Germany
[43]The University of Hong Kong,Pokfulam,Hong Kong
[44]University of Science and Technology of China, Department of Modern Physics,Hefei,China
[45]Uppsala Universitet,Uppsala,Sweden
[46]Institute of Semiconductors Chinese Academy of Sciences, Optoelectronic System Laboratory,Beijing,China
[47]Chinese Academy of Sciences, State Key Laboratory of Geomechanics and Geotechnical Engineering,Beijing,China
[48]Duke University, Department of Physics,Durham,United States
[49]Rice University,Houston,United States
[50]Liaocheng University, Shandong Provincial Key Laboratory of Optical Communication Science and Technology,Liaocheng,China
[51]China Institute of Atomic Energy,Beijing,China
[52]Princeton University, Department of Physics,Princeton,United States
[53]Sun Yat-Sen University,Guangzhou,China
[54]Sichuan University,Chengdu,China
[55]Guangxi Normal University,Guilin,China
[56]Ohio State University,Columbus,United States
[57]Shanxi University,Taiyuan,China
[58]Shanxi University, Institute of Applied Chemistry,Taiyuan,China
[59]Wuhan University,Wuhan,China
[60]Macau University of Science and Technology, Faculty of Information Technology,Taipa,Macao
[61]Tsinghua University,Beijing,China
[62]Chinese Academy of Sciences,Beijing,China
[63]Lanzhou University,Lanzhou,China
[64]Peking University, College of Environmental Science and Engineering,Beijing,China
[65]City University of Hong Kong, School of Creative Media,Hong Kong,China
[66]Henan Normal University, Institute of Particle and Nuclear Physics,Xinxiang,China
[67]Fermi National Accelerator Laboratory,Batavia,United States
[68]Zhejiang University,Hangzhou,China
[69]Liaoning University, Department of Chemistry,Shenyang,China
[70]Brookhaven National Laboratory, Department of Physics,Upton,United States
[71]Lawrence Livermore National Laboratory,Livermore,United States
[72]Vanderbilt University,Nashville,United States
[73]Indiana University,Bloomington,United States
[74]Helmholtz-Institut Mainz,Mainz,Germany
[75]Seoul National University,Seoul,South Korea
[76]Universita degli Studi di Perugia,Perugia,Italy
[77]The University of Hong Kong, Department of Physics,Pokfulam,Hong Kong
[78]Universitat Bonn, Helmholtz-Institut für Strahlen- und Kernphysik,Bonn,Germany
[79]Technische Universitat Berlin, Institute for Solid State Physics,Berlin,Germany
[80]Beihang University,Beijing,China
[81]University of Tokyo,Tokyo,Japan
[82]Henan Normal University, College of Physics and Electronic Engineering,Xinxiang,China
[83]University of Minnesota System,,United States
[84]National Taiwan University,Taipei,Taiwan
[85]Chengdu Institute of Organic Chemistry Chinese Academy of Sciences,Chengdu,China
[86]McGill University, Department of Physics,Montreal,Canada
[87]University of Florida,Gainesville,United States
[88]Helmholtz Institute Mainz,Mainz,Germany
[89]Soochow University,Suzhou,China
[90]Texas Tech University at Lubbock,Lubbock,United States
[91]East China Normal University, Department of Mathematics,Shanghai,China
[92]Nanjing Normal University, Department of Physics,Nanjing,China
[93]Huazhong Normal University, Institute of Particle Physics,Wuhan,China
[94]Peking University,Beijing,China
[95]East China Normal University, Department of Chemistry,Shanghai,China
[96]Nankai University, School of Physics,Tianjin,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 Center of Advanced Science and Technology World Laboratory,Beijing,China
[102]Wuhan Electric Power Technical College,Wuhan,China
[103]Hunan University, School of Physics and Microelectronics Science,Changsha,China
[104]Donghua University, College of Materials Science and Engineering,Shanghai,China
[105]Argonne National Laboratory, High Energy Physics Division,Argonne,United States
[106]Chongqing University,Chongqing,China
[107]Shanghai Institute of Applied Physics, Chinese Academy of Sciences,Shanghai,China
[108]s University, Kingston, Department of Physics,Kingston,Canada
[109]Huashan Hospital, Department of Neurosurgery,Shanghai,China
[110]Peking University, School of Physics,Beijing,China
[111]Hefei National Laboratory for Physical Sciences at Microscale, Synergetic Innovation Center of Quantum Information and Quantum Physics,Hefei,China
[112]Sichuan University, Department of Periodontics,Chengdu,China
[113]Tianjin University, School of Environmental Science and Engineering,Tianjin,China
[114]Guangxi University, Physics Science and Engineering Technology Department,Nanning,China
[115]University of South China,Hengyang,China
[116]Faculdade de Ciencias e Tecnologia, New University of Lisbon, Dep Fisica,Caparica,Portugal
[117]University of Science and Technology Liaoning,Anshan,China
[118]Institute of High Energy Physics Chinese Academy of Science, Experimental Physics Division,Beijing,China
With a sample of (225.2±2.8)×106 J/ψ events registered in the BESIII detector, J/ψ→γπ+π -η′ is studied using two η′ decay modes: η′→π+π-η and η′→γρ0. The X(1835), which was previously observed by BESII, is confirmed with a statistical significance that is larger than 20σ. In addition, in the π+π -η′ invariant-mass spectrum, the X(2120) and the X(2370), are observed with statistical significances larger than 7.2σ and 6.4σ, respectively. For the X(1835), the angular distribution of the radiative photon is consistent with expectations for a pseudoscalar. ? 2011 American Physical Society.
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