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ベル実験によるB中間子崩壊のCPの破れの研究

Research Project

Project/Area Number 04F04754
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeSingle-year Grants
Section外国
Research Field Condensed matter physics 1
Research InstitutionHigh Energy Accelerator Research Organization

Principal Investigator

阿部 和雄  大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 教授

Co-Investigator(Kenkyū-buntansha) DRAGIC Jasna  大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 外国人特別研究員
DRAGIC Yasna  大学共同利用機関法人, 高エネルギー加速器研究機構・素粒子原子核研究所, 外国人特別研究員
Project Period (FY) 2004 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 2006: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2005: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2004: ¥500,000 (Direct Cost: ¥500,000)
KeywordsCPの破れ / 小林益川理論 / B中間子 / ファイ2 / ダリッツ解析
Research Abstract

小林益川理論によると、中性B中間子がロー中間子とパイ中間子に崩壊する頻度はB中間子と反B中間子とでは微妙に違うはずで、その測定から理論パラメターφ2が決められるはずである。本研究では終状態のロー中間子とパイ中間子が両方とも中性である崩壊過程を始めて見つけ、その崩壊分岐比を測定した。この結果が多くの理論的予想より有意に大きな値になったので話題を呼んだが、我々はさらに精度を上げた測定を行い、最初の結果が正しいことを確認した。この結果は理論の修正につながった。その後、終状態のロー中間子とパイ中間子が電荷を持ったケースについての測定もおこなわれ、両方の分岐比からφ2の決定が試みられ、現在ではφ2が10パーセントの精度で求まるまでに到っている。この過程で本研究の果たした先駆的な役割はきわめて大きい。

Report

(3 results)
  • 2006 Annual Research Report
  • 2005 Annual Research Report
  • 2004 Annual Research Report
  • Research Products

    (10 results)

All 2006 2005

All Journal Article (10 results)

  • [Journal Article] Measurement of branching fraction and direct CP asymmetry in BO ->rho0pi0 decays2006

    • Author(s)
      J.Dragic他
    • Journal Title

      Physical Review D 73

      Pages: 111105-111105

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Measurement of the Branching Fraction, Polarization, and CP Asymmetry for BO->rho+rho-Decays, and Determination of the Cabibbo-Kobayashi-Maskawa Phase phi22006

    • Author(s)
      A.Somov, J.Dragic他
    • Journal Title

      Physical Review Letters 96

      Pages: 171801-171801

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Study of B+- ->DcpK+- and D*cpK+- decays2006

    • Author(s)
      K.Abe, J.Dragic
    • Journal Title

      Physical Review D 73

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Observation of B+ to K+ eta gamma2005

    • Author(s)
      Belle Collaboration
    • Journal Title

      Physics Letters B 610

      Pages: 23-23

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Measurements of branching fractions and CP asymmetries in B to eta h decays2005

    • Author(s)
      Belle Collaboration
    • Journal Title

      Physical Review D 71

      Pages: 91106-91106

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Observation of BO to piO piO2005

    • Author(s)
      Belle Collaboration
    • Journal Title

      Physical Review Letters 94

      Pages: 181803-181803

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Observation of an Isotriplet of Excited Charmed Baryons Decaying to Sigma-c+ pi2005

    • Author(s)
      Belle Collaboration
    • Journal Title

      Physical Review Letters 94

      Pages: 122002-122002

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Measurement of the Time-Dependent CP Violating Asymmetry in BO to KsO piO gamma Decays2005

    • Author(s)
      Belle Collaboration
    • Journal Title

      Physical Review Letters 94

      Pages: 231601-231601

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Measurement of Vub near the endpoint of the electron momentum spectrum from semileptonic B-meson decays2005

    • Author(s)
      Belle Collaboration
    • Journal Title

      Physics Letters B 621

      Pages: 28-28

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Measurements of the Branching Fraction and Polarization in B+ to rho+ K*O Decays2005

    • Author(s)
      Belle Collaboration
    • Journal Title

      Physical Review Letters

      Pages: 141801-141801

    • Related Report
      2005 Annual Research Report

URL: 

Published: 2004-04-01   Modified: 2024-03-26  

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