Observation of Large<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">CP</mml:mi></mml:math>Violation in the Neutral<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">B</mml:mi></mml:math>Meson System
K. AbeHigh Energy Accelerator Research Organization (KEK), TsukubaR. AbeNiigata University, NiigataI. AdachiHigh Energy Accelerator Research Organization (KEK), TsukubaByoung Sup AhnKorea University, SeoulH. AiharaUniversity of Tokyo, TokyoM. AkatsuNagoya University, NagoyaGianluca AlimontiHonolulu UniversityK. AsaiNara Women's University, NaraMakoto AsaiHiroshima Institute of Technology, HiroshimaY. 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 WalesE. BanaśH. Niewodniczanski Institute of Nuclear Physics, KrakowS. BehariHigh Energy Accelerator Research Organization (KEK), TsukubaP. K. BeheraUtkal University, BhubaneswerD. BeilineBudker Institute of Nuclear Physics, NovosibirskA. BondarBudker Institute of Nuclear Physics, NovosibirskA. BożekH. Niewodniczanski Institute of Nuclear Physics, KrakowT. E. BrowderUniversity of Hawaii, Honolulu, HawaiiB. C. K. CaseyUniversity of Hawaii, Honolulu, HawaiiP. ChangNational Taiwan University, TaipeiY. ChaoNational Taiwan University, TaipeiB. G. CheonSungkyunkwan University, SuwonR. ChistovInstitute for Theoretical and Experimental Physics, MoscowS.-K. ChoiGyeongsang National University, ChinjuY. ChoiSungkyunkwan University, SuwonL. Y. DongInstitute of High Energy Physics, Chinese Academy of Sciences, BeijingJ. DragicUniversity of Melbourne, VictoriaA. DrutskoyInstitute for Theoretical and Experimental Physics, MoscowS. EidelmanBudker Institute of Nuclear Physics, NovosibirskV. EigesInstitute for Theoretical and Experimental Physics, MoscowY. EnariNagoya University, NagoyaR. EnomotoHigh Energy Accelerator Research Organization (KEK), TsukubaC.W. EvertonUniversity of Melbourne, VictoriaF. FangUniversity of Hawaii, Honolulu, HawaiiH. FujiiHigh Energy Accelerator Research Organization (KEK), TsukubaC. FukunagaTokyo Metropolitan University, TokyoM. FukushimaInstitute for Cosmic Ray Research, University of Tokyo, TokyoN. GabyshevHigh Energy Accelerator Research Organization (KEK), TsukubaA. GarmashBudker Institute of Nuclear Physics, NovosibirskT.J. GershonHigh Energy Accelerator Research Organization (KEK), TsukubaAscelin GordonUniversity of Melbourne, VictoriaK. GotowVirginia Polytechnic Institute and State University, Blacksburg, VirginiaH. GulerUniversity of Hawaii, Honolulu, HawaiiR. GuoNational Kaohsiung Normal University, KaohsiungJ. HabaHigh Energy Accelerator Research Organization (KEK), TsukubaH. HamasakiHigh Energy Accelerator Research Organization (KEK), TsukubaK. HanagakiPrinceton University, Princeton, New JerseyF. HandaTohoku University, SendaiK. HaraOsaka University, OsakaT. HaraOsaka University, OsakaN. C. HastingsUniversity of Melbourne, VictoriaH. HayashiiNara Women's University, NaraM. HazumiOsaka University, OsakaE.M. HeenanUniversity of Melbourne, VictoriaY. HigasinoNagoya University, NagoyaI. HiguchiTohoku University, SendaiToshiro HiguchiUniversity of Tokyo, TokyoT. HiraiTokyo Institute of Technology, TokyoHiroyuki HiranoTokyo University of Agriculture and Technology, TokyoT. HojoOsaka University, OsakaT. HokuueNagoya University, NagoyaY. HoshiTohoku Gakuin University, TagajoK. HoshinaTokyo University of Agriculture and Technology, TokyoS. HouNational Taiwan University, TaipeiW.-S. HouNational Taiwan University, TaipeiS.‐C. HsuNational Taiwan University, TaipeiHsuan‐Cheng HuangNational Taiwan University, TaipeiY. IgarashiHigh Energy Accelerator Research Organization (KEK), TsukubaT. IijimaHigh Energy Accelerator Research Organization (KEK), TsukubaH. IkedaHigh Energy Accelerator Research Organization (KEK), TsukubaKiyohiro IkedaNara Women's University, NaraK. InamiNagoya University, NagoyaA. IshikawaNagoya University, NagoyaH IshinoTokyo Institute of Technology, TokyoR. ItohHigh Energy Accelerator Research Organization (KEK), TsukubaG. IwaiNiigata University, NiigataM. IwasakiHigh Energy Accelerator Research Organization (KEK), TsukubaY. IwasakiHigh Energy Accelerator Research Organization (KEK), TsukubaD. J. JacksonOsaka University, OsakaP. JałochaH. Niewodniczanski Institute of Nuclear Physics, KrakowHyejin JangSeoul National University, SeoulM. JonesUniversity of Hawaii, Honolulu, HawaiiR. KaganInstitute for Theoretical and Experimental Physics, MoscowH. KakunoTokyo Institute of Technology, TokyoJ. KanekoTokyo Institute of Technology, TokyoJ. H. KangKorea University, SeoulJ. S. KangKorea University, SeoulP. KapustaH. Niewodniczanski Institute of Nuclear Physics, KrakowN KatayamaHigh Energy Accelerator Research Organization (KEK), TsukubaH. KawaiChiba University, ChibaH. KawaiUniversity of Tokyo, TokyoY. KawakamiNagoya University, NagoyaN. KawamuraAomori University, AomoriT. KawasakiNiigata University, NiigataH KichimiHigh Energy Accelerator Research Organization (KEK), Tsukuba
2001en
ABI
Аннотация
We present a measurement of the standard model $\mathrm{CP}$ violation parameter $\mathrm{sin}2{\ensuremath{\varphi}}_{1}$ based on a $29.1{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected at the $\ensuremath{\Upsilon}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. One neutral $B$ meson is fully reconstructed as a $J/\ensuremath{\psi}{K}_{S}$, $\ensuremath{\psi}(2S){K}_{S}$, ${\ensuremath{\chi}}_{c1}{K}_{S}$, ${\ensuremath{\eta}}_{c}{K}_{S}$, $J/\ensuremath{\psi}{K}_{L}$, or $J/\ensuremath{\psi}{K}^{*0}$ decay and the flavor of the accompanying $B$ meson is identified from its decay products. From the asymmetry in the distribution of the time intervals between the two $B$ meson decay points, we determine $\mathrm{sin}2{\ensuremath{\varphi}}_{1}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.99\ifmmode\pm\else\textpm\fi{}0.14(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.06(\mathrm{syst})$. We conclude that we have observed $\mathrm{CP}$ violation in the neutral $B$ meson system.
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