Статья

Observation of a Resonancelike Structure in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>π</mml:mi><mml:mrow><mml:mo>+</mml:mo><mml:mo>−</mml:mo></mml:mrow></mml:msup><mml:msup><mml:mi>ψ</mml:mi><mml:mo>′</mml:mo></mml:msup></mml:math>Mass Distribution in Exclusive<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi><mml:mo>→</mml:mo><mml:mi>K</mml:mi><mml:msup><mml:mi>π</mml:mi><mml:mrow><mml:mo>+</mml:mo><mml:mo>−</mml:mo></mml:mrow></mml:msup><mml:msup><mml:mi>ψ</mml:mi><mml:mo>′</mml:mo></mml:msup></mml:math>Decays

S.-K. ChoiGyeongsang National University, ChinjuS. L. OlsenInstitute of High Energy Physics, Chinese Academy of Sciences, BeijingI. AdachiHigh Energy Accelerator Research Organization (KEK), TsukubaH. AiharaDepartment of Physics, University of Tokyo, TokyoV. AulchenkoBudker Institute of Nuclear Physics, NovosibirskTagir AushevInstitute for Theoretical and Experimental Physics, MoscowT. AzizTata Institute of Fundamental Research, MumbaiA. M. BakichUniversity of Sydney, Sydney, New South WalesV. BalaguraInstitute for Theoretical and Experimental Physics, MoscowI. BednyBudker Institute of Nuclear Physics, NovosibirskU. BitencJ. Stefan Institute, LjubljanaA. BondarBudker Institute of Nuclear Physics, NovosibirskA. BożekH. Niewodniczanski Institute of Nuclear Physics, KrakowM. BračkoJ. Stefan Institute, LjubljanaJ. BrodzickaHigh Energy Accelerator Research Organization (KEK), TsukubaT. E. BrowderUniversity of Hawaii SystemP. ChangDepartment of Physics, National Taiwan University, TaipeiY. ChaoDepartment of Physics, National Taiwan University, TaipeiK. F. ChenNational Central University, Chung-liW. T. ChenNational Central University, Chung-liB. G. CheonHanyang University, SeoulR. ChistovInstitute for Theoretical and Experimental Physics, MoscowY. ChoiSungkyunkwan University, SuwonJ. DalsenoUniversity of Melbourne, School of Physics, Victoria 3010M. DanilovInstitute for Theoretical and Experimental Physics, MoscowM. DashVirginia Polytechnic Institute and State University, Blacksburg, Virginia 24061S. EidelmanBudker Institute of Nuclear Physics, NovosibirskN. GabyshevBudker Institute of Nuclear Physics, NovosibirskB. GolobJ. Stefan Institute, LjubljanaJ. HabaHigh Energy Accelerator Research Organization (KEK), TsukubaT. HaraOsaka University, OsakaK. HayasakaNagoya University, NagoyaH. HayashiiNara Women’s University, NaraM. HazumiHigh Energy Accelerator Research Organization (KEK), TsukubaD. HeffernanOsaka University, OsakaY. HoshiTohoku Gakuin University, TagajoW.-S. HouDepartment of Physics, National Taiwan University, TaipeiH. J. HyunKyungpook National University, TaeguT. IijimaNagoya University, NagoyaK. InamiNagoya University, NagoyaA. IshikawaSaga University, SagaH. IshinoTokyo Institute of Technology, TokyoR. ItohHigh Energy Accelerator Research Organization (KEK), TsukubaM. IwasakiDepartment of Physics, University of Tokyo, TokyoD. H. KahKyungpook National University, TaeguJ. H. KangYonsei University, SeoulN. KatayamaHigh Energy Accelerator Research Organization (KEK), TsukubaH. KawaiChiba University, ChibaT. KawasakiNiigata University, NiigataH. KichimiHigh Energy Accelerator Research Organization (KEK), TsukubaH. O. KimKyungpook National University, TaeguS. K. KimSeoul National University, SeoulY. J. KimThe Graduate University for Advanced Studies, HayamaK. KinoshitaUniversity of Cincinnati, Cincinnati, Ohio 45221P. KrižanJ. Stefan Institute, LjubljanaP. KrokovnyHigh Energy Accelerator Research Organization (KEK), TsukubaR. KumarPanjab University, ChandigarhC. C. KuoNational Central University, Chung-liA. KuzminBudker Institute of Nuclear Physics, NovosibirskY.-J. KwonYonsei University, SeoulJ. S. LangeJustus-Liebig-Universität Gießen, GießenJ. S. LeeSungkyunkwan University, SuwonM. J. LeeSeoul National University, SeoulS. E. LeeSeoul National University, SeoulT. LesiakH. Niewodniczanski Institute of Nuclear Physics, KrakowA. LimosaniUniversity of Melbourne, School of Physics, Victoria 3010S.-W. LinDepartment of Physics, National Taiwan University, TaipeiY. LiuThe Graduate University for Advanced Studies, HayamaD. LiventsevInstitute for Theoretical and Experimental Physics, MoscowF. MandlInstitute of High Energy Physics, ViennaA. MatyjaH. Niewodniczanski Institute of Nuclear Physics, KrakowS. McOnieUniversity of Sydney, Sydney, New South WalesT. MedvedevaInstitute for Theoretical and Experimental Physics, MoscowW. MitaroffInstitute of High Energy Physics, ViennaK. MiyabayashiNara Women’s University, NaraH. MiyakeOsaka University, OsakaH. MiyataNiigata University, NiigataY. MiyazakiNagoya University, NagoyaR. MizukInstitute for Theoretical and Experimental Physics, MoscowG. R. MoloneyUniversity of Melbourne, School of Physics, Victoria 3010E. NakanoOsaka City University, OsakaM. NakaoHigh Energy Accelerator Research Organization (KEK), TsukubaS. NishidaHigh Energy Accelerator Research Organization (KEK), TsukubaO. NitohTokyo University of Agriculture and Technology, TokyoT. NozakiHigh Energy Accelerator Research Organization (KEK), TsukubaS. OgawaToho University, FunabashiT. OhshimaNagoya University, NagoyaS. OkunoKanagawa University, YokohamaH. OzakiHigh Energy Accelerator Research Organization (KEK), TsukubaP. PakhlovInstitute for Theoretical and Experimental Physics, MoscowG. PakhlovaInstitute for Theoretical and Experimental Physics, MoscowC. W. ParkSungkyunkwan University, SuwonH. ParkKyungpook National University, TaeguL. S. PeakUniversity of Sydney, Sydney, New South WalesM. PiccoloJ. Stefan Institute, LjubljanaL. E. PiilonenVirginia Polytechnic Institute and State University, Blacksburg, Virginia 24061H. SahooUniversity of Hawaii, Honolulu, Hawaii 96822Y. SakaiHigh Energy Accelerator Research Organization (KEK), Tsukuba

2008lv

ABI

Аннотация

A distinct peak is observed in the ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\psi}}^{\ensuremath{'}}$ invariant mass distribution near 4.43 GeV in $B\ensuremath{\rightarrow}K{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\psi}}^{\ensuremath{'}}$ decays. A fit using a Breit-Wigner resonance shape yields a peak mass and width of $M=4433\ifmmode\pm\else\textpm\fi{}4(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}2(\mathrm{syst})\text{ }\text{ }\mathrm{MeV}$ and $\ensuremath{\Gamma}={45}_{\ensuremath{-}13}^{+18}(\mathrm{stat}{)}_{\ensuremath{-}13}^{+30}(\mathrm{syst})\text{ }\text{ }\mathrm{MeV}$. The product branching fraction is determined to be $\mathcal{B}\mathbf{(}{B}^{0}\ensuremath{\rightarrow}{K}^{\ensuremath{\mp}}{Z}^{\ifmmode\pm\else\textpm\fi{}}(4430)\mathbf{)}\ifmmode\times\else\texttimes\fi{}\mathcal{B}\mathbf{(}{Z}^{\ifmmode\pm\else\textpm\fi{}}(4430)\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\psi}}^{\ensuremath{'}}\mathbf{)}=(4.1\ifmmode\pm\else\textpm\fi{}1.0(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}1.4(\mathrm{syst}))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$, where ${Z}^{\ifmmode\pm\else\textpm\fi{}}(4430)$ is used to denote the observed structure. The statistical significance of the observed peak is $6.5\ensuremath{\sigma}$. These results are obtained from a $605\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample that contains $657\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs collected near the $\ensuremath{\Upsilon}(4S)$ resonance with the Belle detector at the KEKB asymmetric energy ${e}^{+}{e}^{\ensuremath{-}}$ collider.

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Идентификаторы

DOI: 10.1103/physrevlett.100.142001

Цитирования и источники

Цитирований: 3Использованных источников: 0

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