Observation of a Narrow Charmoniumlike State in Exclusive<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mo>±</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:msup><mml:mi>K</mml:mi><mml:mo>±</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi></mml:math>Decays
S.-K. ChoiGyeongsang National University, ChinjuS. L. OlsenUniversity of Hawaii, Honolulu, Hawaii 96822K. AbeHigh Energy Accelerator Research Organization (KEK), TsukubaI. AdachiHigh Energy Accelerator Research Organization (KEK), TsukubaByoung Sup AhnKorea University, SeoulH. AiharaDepartment of Physics, University of Tokyo, TokyoK. AkaiHigh Energy Accelerator Research Organization (KEK), TsukubaM. AkatsuNagoya University, NagoyaM. AkemotoHigh Energy Accelerator Research Organization (KEK), TsukubaY. AsanoUniversity of Tsukuba, TsukubaT. AsoToyama National College of Maritime Technology, ToyamaK. F. ChenBudker Institute of Nuclear Physics, NovosibirskT. AushevInstitute for Theoretical and Experimental Physics, MoscowA. M. BakichUniversity of Sydney, Sydney, New South WalesY. BanPeking University, BeijingSw. BanerjeeTata Institute of Fundamental Research, BombayA. BondarBudker Institute of Nuclear Physics, NovosibirskA. BożekH. Niewodniczanski Institute of Nuclear Physics, KrakowM. BračkoJ. Stefan Institute, LjubljanaJ. BrodzickaH. Niewodniczanski Institute of Nuclear Physics, KrakowT. E. BrowderUniversity of Hawaii, Honolulu, Hawaii 96822P. ChangDepartment of Physics, National Taiwan University, TaipeiY. ChaoDepartment of Physics, National Taiwan University, TaipeiB. G. CheonSungkyunkwan University, SuwonR. ChistovInstitute for Theoretical and Experimental Physics, MoscowY. ChoiSungkyunkwan University, SuwonY. K. ChoiSungkyunkwan University, SuwonM. DanilovInstitute for Theoretical and Experimental Physics, MoscowL. Y. DongInstitute of High Energy Physics, Chinese Academy of Sciences, BeijingA. DrutskoyInstitute for Theoretical and Experimental Physics, MoscowS. EidelmanBudker Institute of Nuclear Physics, NovosibirskV. EigesInstitute for Theoretical and Experimental Physics, MoscowJ. FlanaganHigh Energy Accelerator Research Organization (KEK), TsukubaC. FukunagaTokyo Metropolitan University, TokyoK. FurukawaHigh Energy Accelerator Research Organization (KEK), TsukubaN. GabyshevHigh Energy Accelerator Research Organization (KEK), TsukubaT. GershonHigh Energy Accelerator Research Organization (KEK), TsukubaB. GolobJ. Stefan Institute, LjubljanaH. GulerUniversity of Hawaii, Honolulu, Hawaii 96822R. GuoNational Kaohsiung Normal University, KaohsiungC. HagnerVirginia Polytechnic Institute and State University, Blacksburg, Virginia 24061F. HandaTohoku University, SendaiT. HaraOsaka University, OsakaN. C. HastingsHigh Energy Accelerator Research Organization (KEK), TsukubaH. HayashiiNara Women’s University, NaraM. HazumiHigh Energy Accelerator Research Organization (KEK), TsukubaL. HinzInstitut de Physique des Hautes Énergies, Université de Lausanne, LausanneY. HoshiTohoku Gakuin University, TagajoW.-S. HouDepartment of Physics, National Taiwan University, TaipeiY. HsiungDepartment of Physics, National Taiwan University, TaipeiHsuan‐Cheng HuangDepartment of Physics, National Taiwan University, TaipeiT. IijimaNagoya University, NagoyaK. InamiNagoya University, NagoyaA. IshikawaNagoya University, NagoyaR. ItohHigh Energy Accelerator Research Organization (KEK), TsukubaM. IwasakiDepartment of Physics, University of Tokyo, TokyoJ. H. KangYonsei University, SeoulS.U. KataokaNara Women’s University, NaraN. KatayamaHigh Energy Accelerator Research Organization (KEK), TsukubaH. KawaiChiba University, ChibaT. KawasakiNiigata University, NiigataH. KichimiHigh Energy Accelerator Research Organization (KEK), TsukubaE. KikutaniHigh Energy Accelerator Research Organization (KEK), TsukubaH. J. KimKorea University, SeoulHyunwoo KimKorea University, SeoulJ. H. KimSungkyunkwan University, SuwonS. K. KimSeoul National University, SeoulK. KinoshitaUniversity of Cincinnati, Cincinnati, Ohio 45221H. KoisoHigh Energy Accelerator Research Organization (KEK), TsukubaP. KoppenburgHigh Energy Accelerator Research Organization (KEK), TsukubaS. KorparJ. Stefan Institute, LjubljanaP. KrižanJ. Stefan Institute, LjubljanaP. KrokovnyBudker Institute of Nuclear Physics, NovosibirskSuneel KumarPanjab University, ChandigarhA. KuzminBudker Institute of Nuclear Physics, NovosibirskJ. S. LangeRIKEN BNL Research Center, Upton, New York 11973G. LederInstitute of High Energy Physics, ViennaS. H. LeeSeoul National University, SeoulT. LesiakH. Niewodniczanski Institute of Nuclear Physics, KrakowS.-W. LinDepartment of Physics, National Taiwan University, TaipeiD. LiventsevInstitute for Theoretical and Experimental Physics, MoscowJ. MacNaughtonInstitute of High Energy Physics, ViennaD. MajumderTata Institute of Fundamental Research, BombayF. MandlInstitute of High Energy Physics, ViennaD. MarlowPrinceton University, Princeton, New Jersey 08545T. MatsumotoTokyo Metropolitan University, TokyoShinichiro MichizonoHigh Energy Accelerator Research Organization (KEK), TsukubaT. MimashiHigh Energy Accelerator Research Organization (KEK), TsukubaW. MitaroffInstitute of High Energy Physics, ViennaK. MiyabayashiNara Women’s University, NaraH. MiyakeOsaka University, OsakaD. MohapatraVirginia Polytechnic Institute and State University, Blacksburg, Virginia 24061G. R. MoloneyUniversity of Melbourne, VictoriaT. NagamineTohoku University, SendaiY. NagasakaHiroshima Institute of Technology, HiroshimaT. NakadairaDepartment of Physics, University of Tokyo, TokyoT. NakamuraHigh Energy Accelerator Research Organization (KEK), Tsukuba
2003lv
ABI
Annotatsiya
We report the observation of a narrow charmoniumlike state produced in the exclusive decay process ${B}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}{K}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}J/\ensuremath{\psi}$. This state, which decays into ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}J/\ensuremath{\psi}$, has a mass of $3872.0\ifmmode\pm\else\textpm\fi{}0.6\mathrm{(}\mathrm{s}\mathrm{t}\mathrm{a}\mathrm{t}\mathrm{)}\ifmmode\pm\else\textpm\fi{}0.5\mathrm{(}\mathrm{s}\mathrm{y}\mathrm{s}\mathrm{t}\mathrm{)}\text{ }\text{ }\mathrm{M}\mathrm{e}\mathrm{V}$, a value that is very near the ${M}_{{D}^{0}}+{M}_{{D}^{*0}}$ mass threshold. The results are based on an analysis of 152M $B$-$\overline{B}$ events collected at the $\ensuremath{\Upsilon}(4S)$ resonance in the Belle detector at the KEKB collider. The signal has a statistical significance that is in excess of $10\ensuremath{\sigma}$.
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