Observation of a Charmoniumlike State Produced in Association with a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi></mml:math>in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>Annihilation at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>≈</mml:mo><mml:mn>10.6</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>GeV</mml:mi></mml:math>
K. AbeHigh Energy Accelerator Research Organization (KEK), Tsukuba, JapanI. AdachiHigh Energy Accelerator Research Organization (KEK), TsukubaH. AiharaThe University of Tokyo, Tokyo, JapanK. ArinsteinBudker Institute of Nuclear Physics, Novosibirsk, RussiaY. AsanoUniversity of Tsukuba, Tsukuba, JapanK. F. ChenBudker Institute of Nuclear Physics, Novosibirsk, RussiaTagir AushevInstitute for Theoretical and Experimental Physics, MoscowT. AzizTata Institute of Fundamental Research, Mumbai, IndiaA. M. BakichUniversity of Sydney, Sydney, AustraliaV. BalaguraInstitute for Theoretical and Experimental Physics, MoscowM. BarberoUniversity of Hawaii, Honolulu, Hawaii 96822I. BednyBudker Institute of Nuclear Physics, Novosibirsk, RussiaU. BitencJ. Stefan Institute, LjubljanaI. BizjakJ. Stefan Institute, LjubljanaA. BondarBudker Institute of Nuclear Physics, Novosibirsk, RussiaM. BračkoUniversity of Maribor, Maribor, SloveniaJ. BrodzickaPolish Academy of Sciences, Warsaw, PolandT. E. BrowderUniversity of Hawaii, Honolulu, Hawaii 96822Y. ChaoNational Taiwan University, Taipei, TaiwanA. ChenNational Central University, Taoyuan City, TaiwanB. G. CheonChonnam National University, Gwangju, South KoreaR. ChistovInstitute for Theoretical and Experimental Physics, MoscowS.-K. ChoiGyeongsang National University, Jinju, South KoreaY. ChoiSungkyunkwan University, Seoul, South KoreaA. ChuvikovPrinceton University, Princeton, United StatesS. ColeUniversity of Sydney, Sydney, AustraliaJ. DalsenoUniversity of Melbourne, Melbourne, AustraliaM. DanilovInstitute for Theoretical and Experimental Physics, MoscowM. DashVirginia Tech, Blacksburg, United StatesA. DrutskoyUniversity of Cincinnati, Cincinnati, United StatesS. EidelmanBudker Institute of Nuclear Physics, Novosibirsk, RussiaD. EpifanovBudker Institute of Nuclear Physics, Novosibirsk, RussiaS. FratinaJ. Stefan Institute, LjubljanaN. GabyshevBudker Institute of Nuclear Physics, Novosibirsk, RussiaT. GershonHigh Energy Accelerator Research Organization (KEK), TsukubaG. GokhrooTata Institute of Fundamental Research, Mumbai, IndiaB. GolobUniversity of Ljubljana, Ljubljana, SloveniaH. C. HaKorea University, Seoul, South KoreaJ. HabaHigh Energy Accelerator Research Organization (KEK), TsukubaY. HasegawaShinshu University, Matsumoto, JapanK. HayasakaNagoya University, Nagoya, JapanH. HayashiiNara Women's University, Nara, JapanM. HazumiHigh Energy Accelerator Research Organization (KEK), TsukubaL. HinzÉcole Polytechnique Fédérale de Lausanne, Lausanne, SwitzerlandY. HoshiTohoku Gakuin University, Sendai, JapanS. HouNational Central University, Taoyuan City, TaiwanW.-S. HouNational Taiwan University, Taipei, TaiwanY. HsiungNational Taiwan University, Taipei, TaiwanT. IijimaNagoya University, Nagoya, JapanA. IshikawaHigh Energy Accelerator Research Organization (KEK), TsukubaM. IwasakiThe University of Tokyo, Tokyo, JapanP. KapustaPolish Academy of Sciences, Warsaw, PolandT. KawasakiNiigata University, Niigata, JapanH. R. KhanTokyo Institute of Technology, Tokyo, JapanH. KichimiKyungpook National University, TaeguH. J. KimKyungpook National University, Daegu, South KoreaSeajeong KimSungkyunkwan University, Seoul, South KoreaK. KinoshitaUniversity of Cincinnati, Cincinnati, United StatesS. KorparUniversity of Maribor, Maribor, SloveniaP. KrokovnyBudker Institute of Nuclear Physics, Novosibirsk, RussiaC. C. KuoNational Central University, Taoyuan City, TaiwanA. KuzminBudker Institute of Nuclear Physics, Novosibirsk, RussiaJ. S. LangeGoethe University Frankfurt, Frankfurt am Main, GermanyG. LederAustrian Academy of Sciences, Vienna, AustriaT. LesiakPolish Academy of Sciences, Warsaw, PolandA. LimosaniHigh Energy Accelerator Research Organization (KEK), TsukubaS.-W. LinNational Taiwan University, Taipei, TaiwanD. LiventsevInstitute for Theoretical and Experimental Physics, MoscowF. MandlAustrian Academy of Sciences, Vienna, AustriaT. MatsumotoTokyo Metropolitan University, Tokyo, JapanA. MatyjaPolish Academy of Sciences, Warsaw, PolandY. MikamiTohoku University, Sendai, JapanW. MitaroffAustrian Academy of Sciences, Vienna, AustriaK. MiyabayashiNara Women's University, Nara, JapanH. MiyataNiigata University, Niigata, JapanR. MizukInstitute of High Energy Physics, Chinese Academy of Sciences, BeijingY. NagasakaHiroshima Institute of Technology, Hiroshima, JapanE. NakanoOsaka City University, Osaka, JapanM. NakaoInstitute of High Energy Physics, Chinese Academy of Sciences, BeijingS. NishidaInstitute of High Energy Physics, Chinese Academy of Sciences, BeijingO. NitohTokyo University of Agriculture and Technology, Tokyo, JapanS. OgawaToho University, Tokyo, JapanT. OhshimaNagoya University, Nagoya, JapanS. OkunoKanagawa University, Yokohama, JapanS. L. OlsenUniversity of Hawaii, Honolulu, Hawaii 96822H. OzakiInstitute of High Energy Physics, Chinese Academy of Sciences, BeijingP. PakhlovInstitute of High Energy Physics, Chinese Academy of Sciences, BeijingH. PałkaPolish Academy of Sciences, Warsaw, PolandC. W. ParkSungkyunkwan University, Seoul, South KoreaH. ParkKyungpook National University, Daegu, South KoreaK. S. ParkSungkyunkwan University, Seoul, South KoreaL. S. PeakUniversity of Sydney, Sydney, AustraliaL. E. PiilonenVirginia Tech, Blacksburg, United StatesA. PoluektovBudker Institute of Nuclear Physics, Novosibirsk, RussiaY. SakaiInstitute of High Energy Physics, Chinese Academy of Sciences, BeijingN. SatoNagoya University, Nagoya, JapanT. SchietingerÉcole Polytechnique Fédérale de Lausanne, Lausanne, SwitzerlandO. SchneiderÉcole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
2007lv
ABI
Annotatsiya
We report the first observation of a charmoniumlike state recoiling from the $J/\ensuremath{\psi}$ in the inclusive process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}J/\ensuremath{\psi}+\mathrm{\text{anything}}$ at a mass of $(3.943\ifmmode\pm\else\textpm\fi{}0.006\ifmmode\pm\else\textpm\fi{}0.006)\text{ }\text{ }\mathrm{GeV}/{c}^{2}$. We also observe the decay of this state into ${D}^{*}\overline{D}$ and determine its intrinsic width to be less than $52\text{ }\text{ }\mathrm{MeV}/{c}^{2}$ at the 90% C.L. These results are obtained from a $357\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected with the Belle detector near the $\ensuremath{\Upsilon}(4S)$ resonance, at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider.
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