Study of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>e</mml:mi><mml:mo mathvariant="bold">+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo mathvariant="bold">−</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mo mathvariant="bold">+</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo mathvariant="bold">−</mml:mo></mml:msup><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi></mml:math>and Observation of a Charged Charmoniumlike State at Belle
Zhiqing LiuInstitute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049C. P. ShenGraduate School of Science, Nagoya University, Nagoya 464-8602C. Z. YuanInstitute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049I. AdachiHigh Energy Accelerator Research Organization (KEK), Tsukuba 305-0801H. AiharaDepartment of Physics, University of Tokyo, Tokyo 113-0033D. M. AsnerPacific Northwest National Laboratory, Richland, Washington 99352V. AulchenkoBudker Institute of Nuclear Physics SB RAS and Novosibirsk State University, Novosibirsk 630090Tagir AushevInstitute for Theoretical and Experimental Physics, Moscow 117218T. AzizTata Institute of Fundamental Research, Mumbai 400005A. M. BakichSchool of Physics, University of Sydney, New South Wales 2006A. BalaPanjab University, Chandigarh 160014K. BelousInstitute for High Energy Physics, Protvino 142281V. BhardwajNara Women’s University, Nara 630-8506B. BhuyanIndian Institute of Technology Guwahati, Assam 781039M. BischofbergerNara Women’s University, Nara 630-8506A. BondarBudker Institute of Nuclear Physics SB RAS and Novosibirsk State University, Novosibirsk 630090G. BonviciniWayne State University, Detroit, Michigan 48202A. BożekH. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342M. BračkoJ. Stefan Institute, 1000 LjubljanaJ. BrodzickaH. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342T. E. BrowderUniversity of Hawaii, Honolulu, Hawaii 96822P. ChangDepartment of Physics, National Taiwan University, Taipei 10617V. ChekelianMax-Planck-Institut für Physik, 80805 MünchenA. ChenNational Central University, Chung-li 32054P. ChenDepartment of Physics, National Taiwan University, Taipei 10617B. G. CheonHanyang University, Seoul 133-791R. ChistovInstitute for Theoretical and Experimental Physics, Moscow 117218K. ChoKorea Institute of Science and Technology Information, Daejeon 305-806V. ChobanovaMax-Planck-Institut für Physik, 80805 MünchenS.-K. ChoiGyeongsang National University, Chinju 660-701Y. ChoiSungkyunkwan University, Suwon 440-746D. CinabroWayne State University, Detroit, Michigan 48202J. DalsenoExcellence Cluster Universe, Technische Universität München, 85748 GarchingM. DanilovInstitute for Theoretical and Experimental Physics, Moscow 117218Z. DoležalFaculty of Mathematics and Physics, Charles University, 121 16 PragueZ. DrásalFaculty of Mathematics and Physics, Charles University, 121 16 PragueA. DrutskoyInstitute for Theoretical and Experimental Physics, Moscow 117218D. DuttaIndian Institute of Technology Guwahati, Assam 781039Kaustav DuttaIndian Institute of Technology Guwahati, Assam 781039S. EidelmanBudker Institute of Nuclear Physics SB RAS and Novosibirsk State University, Novosibirsk 630090D. EpifanovDepartment of Physics, University of Tokyo, Tokyo 113-0033H. FarhatWayne State University, Detroit, Michigan 48202J. FastPacific Northwest National Laboratory, Richland, Washington 99352M. FeindtInstitut für Experimentelle Kernphysik, Karlsruher Institut für Technologie, 76131 KarlsruheT. FerberDeutsches Elektronen-Synchrotron, 22607 HamburgA. FreyII. Physikalisches Institut, Georg-August-Universität Göttingen, 37073 GöttingenV. GaurTata Institute of Fundamental Research, Mumbai 400005N. GabyshevBudker Institute of Nuclear Physics SB RAS and Novosibirsk State University, Novosibirsk 630090S. GangulyWayne State University, Detroit, Michigan 48202R. GillardWayne State University, Detroit, Michigan 48202Y. M. GohHanyang University, Seoul 133-791B. GolobFaculty of Mathematics and Physics, University of Ljubljana, 1000 LjubljanaJ. HabaHigh Energy Accelerator Research Organization (KEK), Tsukuba 305-0801K. HayasakaKobayashi-Maskawa Institute, Nagoya University, Nagoya 464-8602H. HayashiiNara Women’s University, Nara 630-8506Y. HoriiKobayashi-Maskawa Institute, Nagoya University, Nagoya 464-8602Y. HoshiTohoku Gakuin University, Tagajo 985-8537W.-S. HouDepartment of Physics, National Taiwan University, Taipei 10617Y. HsiungDepartment of Physics, National Taiwan University, Taipei 10617H. J. HyunKyungpook National University, Daegu 702-701T. IijimaGraduate School of Science, Nagoya University, Nagoya 464-8602K. InamiGraduate School of Science, Nagoya University, Nagoya 464-8602A. IshikawaTohoku University, Sendai 980-8578R. ItohHigh Energy Accelerator Research Organization (KEK), Tsukuba 305-0801M. IwasakiHigh Energy Accelerator Research Organization (KEK), Tsukuba 305-0801D. JoffeKennesaw State University, Kennesaw, Georgia 30144T. JuliusSchool of Physics, University of Melbourne, Victoria 3010D. H. KahKyungpook National University, Daegu 702-701J. H. KangYonsei University, Seoul 120-749T. KawasakiNiigata University, Niigata 950-2181C. KieslingMax-Planck-Institut für Physik, 80805 MünchenH. J. KimKyungpook National University, Daegu 702-701J. B. KimKorea Institute of Science and Technology Information, Daejeon 305-806J. H. KimKorea Institute of Science and Technology Information, Daejeon 305-806K. T. KimKorea University, Seoul 136-713M. J. KimKyungpook National University, Daegu 702-701Y. J. KimKorea Institute of Science and Technology Information, Daejeon 305-806K. KinoshitaUniversity of Cincinnati, Cincinnati, Ohio 45221J. KlucarJ. Stefan Institute, 1000 LjubljanaB. R. KoKorea University, Seoul 136-713P. KodyšFaculty of Mathematics and Physics, Charles University, 121 16 PragueS. KorparJ. Stefan Institute, 1000 LjubljanaP. KrižanFaculty of Mathematics and Physics, University of Ljubljana, 1000 LjubljanaP. KrokovnyBudker Institute of Nuclear Physics SB RAS and Novosibirsk State University, Novosibirsk 630090T. KuhrInstitut für Experimentelle Kernphysik, Karlsruher Institut für Technologie, 76131 KarlsruheY.-J. KwonYonsei University, Seoul 120-749J. S. LangeJustus-Liebig-Universität Gießen, 35392 GießenSoohyung LeeKorea University, Seoul 136-713J. LiSeoul National University, Seoul 151-742Y. LiCNP, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061J. LibbyIndian Institute of Technology Madras, Chennai 600036C. LiuUniversity of Science and Technology of China, Hefei 230026P. LukinBudker Institute of Nuclear Physics SB RAS and Novosibirsk State University, Novosibirsk 630090D. MatvienkoBudker Institute of Nuclear Physics SB RAS and Novosibirsk State University, Novosibirsk 630090K. MiyabayashiNara Women’s University, Nara 630-8506H. MiyataNiigata University, Niigata 950-2181R. MizukInstitute for Theoretical and Experimental Physics, Moscow 117218G. B. MohantyTata Institute of Fundamental Research, Mumbai 400005A. MollExcellence Cluster Universe, Technische Universität München, 85748 GarchingR. MussaINFN-Sezione di Torino, 10125 Torino
2013lv
ABI
Аннотация
The cross section for ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}J/\ensuremath{\psi}$ between 3.8 and 5.5 GeV is measured with a $967\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected by the Belle detector at or near the $\ensuremath{\Upsilon}(nS)$ ($n=1,2,\dots{},5$) resonances. The $Y(4260)$ state is observed, and its resonance parameters are determined. In addition, an excess of ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}J/\ensuremath{\psi}$ production around 4 GeV is observed. This feature can be described by a Breit-Wigner parametrization with properties that are consistent with the $Y(4008)$ state that was previously reported by Belle. In a study of $Y(4260)\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}J/\ensuremath{\psi}$ decays, a structure is observed in the $M({\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}J/\ensuremath{\psi})$ mass spectrum with $5.2\ensuremath{\sigma}$ significance, with mass $M=(3894.5\ifmmode\pm\else\textpm\fi{}6.6\ifmmode\pm\else\textpm\fi{}4.5)\text{ }\text{ }\mathrm{MeV}/{c}^{2}$ and width $\ensuremath{\Gamma}=(63\ifmmode\pm\else\textpm\fi{}24\ifmmode\pm\else\textpm\fi{}26)\text{ }\text{ }\mathrm{MeV}/{c}^{2}$, where the errors are statistical and systematic, respectively. This structure can be interpreted as a new charged charmoniumlike state.
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