• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

2004 Fiscal Year Final Research Report Summary

Study of B-meson decays at the KEKB-Factory

Research Project

Project/Area Number 13440083
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 素粒子・核・宇宙線
Research InstitutionInstitute of Particle and Nuclear Studies (2004)
The High Energy Accelerator Research Organization (2001-2003)

Principal Investigator

TAKASAKI Fumihiko  High Energy Accelerator Research Organization, Institute of Particle and Nuclear Studies, Professor, 素粒子原子核研究所, 教授 (70011749)

Co-Investigator(Kenkyū-buntansha) SAKAI Yoshihide  Institute of Partcle and Nuclear Studies, Institute of Particle and Nuclear Studies, Professor, 素粒子原子核研究所, 教授 (90170571)
HABA Junji  Institute of Partcle and Nuclear Studies, Institute of Particle and Nuclear Studies, Professor, 素粒子原子核研究所, 教授 (60180923)
OIDE Katsunobu  Accelerator laboratory, Professor, 加速器研究施設, 教授 (50150008)
KANAZAWA Kenichi  Accelerator laboratory, Professor, 加速器研究施設, 教授 (90161158)
SUETSUGU Yusuke  Accelerator laboratory, Associate Professor, 加速器研究施設, 助教授 (20187610)
Project Period (FY) 2001 – 2004
KeywordsKobayashi-Maskawa Theory / Sanda-Bigi's notice / B-factory / B-meson / CP violation / Vertex detector
Research Abstract

In the Particle Physics, a picture based on three doublets of quarks, proposed by Kobayashi and Maskawa, is so successful that it is conceived as a part of the "Standard Model" of Particles. Originally Kobayashi-Maskawa theory was introduced in 1973 to explain the CP violation observed in the K-meson decays. The most crucial and convincing way of proving the Kobayashi-Maskawa theory is to find the CP violation in the processes other than the K-meson decays. Sanda and Bigi noticed that the effects of CP violation can be large and measurable if the life time is long enough and if the B-meson mixing is large. It turned out that this is really the case and the serious study has started in late 1980s to measure this effect experimentally.
A B-meson factory was constructed along this line of consideration and the experiment has started in 1999. The performance of the accelerator has been improving steadily and its luminosity exceeded the design goal and it is now the world best colliding beam … More accelerator ever built.
Along with the superb performance of the accelerator, the Belle experiment has been operated as it was designed and produces more that 400 million B-meson pairs by the end of March 2005. Thanks to the huge data sample, the Belle experiment has successfully observed the CP violation in 2001 as was proposed by Sanda and Bigi. This provides a very stringent basis for claiming the correctness of the Kobayashi-Maskawa theory, The Belle collaboration has already published more than 120 scientific papers in the refereed journals. The study by the Belle experiment has started to search for effects which may hint the existence of something beyond the standard model.
The success of the Belle experiment is due to the excellent performance of the Belle detector, especially its Vertex detector to measure the B-meson lifetime accurately. This detector has been built, operated and improved by the international team of the Belle collaboration.
The key of the success is also due to the excellent performance of the calorimeter to measure accurately the energy of photons and electrons produced Less

  • Research Products

    (62 results)

All 2003 2002 2001

All Journal Article (62 results)

  • [Journal Article] Studies of the Decay B^±→D_<cp> K^±2003

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL90

      Pages: 131803

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Measurement of the Electroweak Penguin Process B→Xs l^+ l^-2003

    • Author(s)
      J.Kaneko, et al.(Belle Collaboration)
    • Journal Title

      PRL90

      Pages: 021801

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Measurement of Branching Fractions for B→η_cK(^*) Decays2003

    • Author(s)
      F.Fang, et al.(Belle Collaboration)
    • Journal Title

      PRL90

      Pages: 071801

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Observation of B^0→Λ_c^+p decay2003

    • Author(s)
      N.Gabyshev, et al.(Belle Collaboration)
    • Journal Title

      PRL90

      Pages: 121802

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Observation of B^0→D^0 K^0 and B^0→D^0 K^<*0> decays2003

    • Author(s)
      P.Krokovny, et al.(Belle Collaboration)
    • Journal Title

      PRL90

      Pages: 141802

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Observation of B^0→pΛ π^-2003

    • Author(s)
      M.-Z.Wang, et al.(Belle Collaboration)
    • Journal Title

      PRL90

      Pages: 201802

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Evidence for B→φφ K2003

    • Author(s)
      H.-C.Huang, et al.(Belle Collaboration)
    • Journal Title

      PRL91

      Pages: 241802

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Observation for B^+→p^+ p^02003

    • Author(s)
      J.Zhang, et al.(Belle Collaboration)
    • Journal Title

      PRL91

      Pages: 221801

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Measurement of Branching Fractions and Polarization in B→φK(^*) Decays2003

    • Author(s)
      K.-F.Chen, et al.(Belle Collaboration)
    • Journal Title

      PRL91

      Pages: 201801

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Observation of D_<sJ>(2317) and D_<sJ>(2457) in B decays2003

    • Author(s)
      P.Krokovny, et al.(Belle Collaboration
    • Journal Title

      PRL91

      Pages: 262002

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Studies of the Decay B^± → D_<cp> K^±2003

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL 89

      Pages: 131803

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Measurement of the Electroweak Penguin Process B → Xs/^+Γ2003

    • Author(s)
      J.Kaneko, et al.(Belle Collaboration)
    • Journal Title

      PRL 90

      Pages: 021801

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Measurement of Branching Fractions for B →η_cK(^*) Decays2003

    • Author(s)
      F.Fang, et al.(Belle Collaboration)
    • Journal Title

      PRL 90

      Pages: 071801

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Observation of B^0 → Λ_c^+p decay2003

    • Author(s)
      N.Gabyshev, et al.(Belle Collaboration)
    • Journal Title

      PRL 90

      Pages: 121802

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Observation of B^0 → D^0 K^0 and B^0 → D^0 K^<*0> decays2003

    • Author(s)
      P.Krokovny, et al.(Belle Collaboration)
    • Journal Title

      PRL 90

      Pages: 141802

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Observation of B^0 → pΛπ^-2003

    • Author(s)
      M.-Z.Wang, et al.(Belle Collaboration)
    • Journal Title

      PRL 90

      Pages: 201802

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Evidence for B → φφK2003

    • Author(s)
      H.-C.Huang, et al.(Belle Collaboration)
    • Journal Title

      PRL 91

      Pages: 241802

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Observation of B+ → ρ^+ρ^-2003

    • Author(s)
      J.Zhang, et al.(Belle Collaboration)
    • Journal Title

      PRL 91

      Pages: 221801

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Measurement of Branching Fractions and Polarization in B φK(^*) Decays2003

    • Author(s)
      K.-F.Chen, et al.(Belle Collaboration)
    • Journal Title

      PRL 91

      Pages: 201801

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Observation of D_<sJ>(2317) and D_<sJ>(2457) in B decays2003

    • Author(s)
      P.Krokovny, et al.(Belle Collaboration)
    • Journal Title

      PRL 91

      Pages: 262002

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Observation of Color-suppressed Decay B^0→D^0π^02002

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL88

      Pages: 052002

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Observation of the Decay B→K l^+l^-2002

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL88

      Pages: 021801

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Observation of B^+→x_<c0> K^+2002

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL88

      Pages: 031802

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Production of Prompt Charmonia in e+ e- Annihilation at √s〓10.6 GeV2002

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL88

      Pages: 052001

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Measurement of Lifetime Difference in D^0 Meson Decays2002

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL88

      Pages: 162001

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Precise Measurement of B Meson Lifetimes with Hadronic Decay Final States2002

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL88

      Pages: 171801

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Observation of B^±→p p K^±2002

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL88

      Pages: 181803

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Observation of x_<c2> Production in B-meson Decay2002

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL89

      Pages: 011803

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Study of CP-Violating Asymmetries in B^0→π^+π^-Decays2002

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL89

      Pages: 071801

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Radiative B Meson Decays into Kπγ and Kππγ Final States2002

    • Author(s)
      S.Nishida, et al.(Belle Collaboration)
    • Journal Title

      PRL89

      Pages: 231801

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Observation of B^0→D(^*)^0 p p2002

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL89

      Pages: 151802

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Observation of the η_c(2S) in exclusive B→K Ks K^-π^+ decays2002

    • Author(s)
      S.-K.Choi, et al.(Belle Collaboration)
    • Journal Title

      PRL89

      Pages: 102001

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Observation of double ccbar production at e^+e^- annihilation at √s〜10.6 GeV2002

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL89

      Pages: 142001

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Observation of the decay B^0→D^<+^-> D^<*-+>2002

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL89

      Pages: 122001

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Observation of B^±→ωK^± Decay2002

    • Author(s)
      R.-S.Lu, et al.(Belle Collaboration)
    • Journal Title

      PRL89

      Pages: 191801

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Measurement of the B^0-B^0 Mixing Parameter Δm_d using Semileptonic B^0 Decays2002

    • Author(s)
      K.Hara, et al.(Belle CollaboratiofiT
    • Journal Title

      PRL89

      Pages: 251803

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Observation of D_s^+ K^- and evidence for D_s^+π^- final states in neutral B decays2002

    • Author(s)
      R.Krokovny, et al.(Belle Collaboration)
    • Journal Title

      PRL89

      Pages: 231801

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Observation of Color-suppressed Decay B^0 - D^0π^02002

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL 88

      Pages: 052002

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Observation of the Decay B → K/^+Γ2002

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL 88

      Pages: 021801

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Observation of B+ →χ_c0K^+2002

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL 88

      Pages: 031802

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Production of Prompt Charmonia in e+ e- Annihilation at √s 〓 10.6 GeV2002

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL 88

      Pages: 052001

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Measurement of Lifetime Difference in D^0 Meson Decays2002

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL 88

      Pages: 162001

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Precise Measurement of B Meson Lifetimes with Hadronic Decay Final States2002

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL 88

      Pages: 171801

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Observation of B^± → p p K^±2002

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL 88

      Pages: 181803

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Observation of χ_<c2> Production in B-meson Decay2002

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL 89

      Pages: 011803

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Study of CP-Violating Asymmetries in B^0 → π^+π^- Decays2002

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL 89

      Pages: 071801

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Radiative B Meson Decays into Kπγ and Kππγ Final States2002

    • Author(s)
      S.Nishida, et al.(Belle Collaboration)
    • Journal Title

      PRL 89

      Pages: 23801

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Observation of B^0 → D(^*)0 p p2002

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL 89

      Pages: 151802

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Observation of the η_c(2S) in exclusive B → K Ks K^-π^+ decays2002

    • Author(s)
      S.-K.Choi, et al.(Belle Collaboration)
    • Journal Title

      PRL 89

      Pages: 102001

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Observation of double ccbar production at e^+e^- annihilation at √s〜10.6 GeV2002

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL 89

      Pages: 142001

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Observation of the decay B^0 → D^<+-> D^<*-+>2002

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL 89

      Pages: 122001

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Observation of B± → ωK^± Decay2002

    • Author(s)
      R.-S.Lu, et al.(Belle Collaboration)
    • Journal Title

      PRL 89

      Pages: 191801

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Measurement of the B^0-B^0 Mixing Parameter Δm_d using Semileptonic B^0 Decays2002

    • Author(s)
      K.Hara, et al.(Belle Collaborations)
    • Journal Title

      PRL 89

      Pages: 251803

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Observation of D_s^+ K^- and evidence for D_s^+π^- final states in neutral B decays2002

    • Author(s)
      P.Krokovny, et al.(Belle Collaboration)
    • Journal Title

      PRL 89

      Pages: 231804

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Observation of Large CP Violation in the Neutral B Meson System2001

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL87

      Pages: 091802

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Measurement of Branching Fractions for B→ππ, Kπ and KK Decays2001

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL87

      Pages: 101801

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Observation of Cabibbo suppressed B→D(^*)K^- decays at Belle2001

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL87

      Pages: 111801

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Observation of B→J/Ψ K_1(1270)2001

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL87

      Pages: 161601

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Observation of Large CP Violation in the Neutral B Meson System2001

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL 87

      Pages: 091802

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Measurement of Branching Fractions for B →ππ, Kπ and KK Decays2001

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL 87

      Pages: 101801

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Observation of Cabibbo suppressed B →D(^*)K^- decays at Belle2001

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL 87

      Pages: 111801

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Observation of B → J/ΨK_1(1270)2001

    • Author(s)
      K.Abe, et al.(Belle Collaboration)
    • Journal Title

      PRL 87

      Pages: 161601

    • Description
      「研究成果報告書概要(欧文)」より

URL: 

Published: 2006-07-11  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi