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Test of non-perturbative QCD by means of the measurement of Kπ scattering length -Extension of DIRAC experiment-

Research Project

Project/Area Number 14340079
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 InstitutionKyoto Sangyo University

Principal Investigator

TAKEUTCHI Fujio  Kyoto Sangyo University, Faculty of Science, Professor, 理学部, 教授 (40121537)

Co-Investigator(Kenkyū-buntansha) OKADA Kenji  Kyoto Sangyo University, Faculty of Science, Professor, 理学部, 教授 (90093385)
KOBAYASHI Masaaki  High Energy Accelerator Research Organization, Professor emeritus, 名誉教授 (40013388)
CHIBA Masami  Metropolitan University, Graduate school of Science and Technology, Research Associate, 都市教養学部理工学系, 准教授 (60128577)
YOSHIMURA Yoshio  High Energy Accelerator Research Organization, Professor emeritus, 名誉教授 (50013397)
Project Period (FY) 2002 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥14,400,000 (Direct Cost: ¥14,400,000)
Fiscal Year 2005: ¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 2004: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2003: ¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 2002: ¥3,700,000 (Direct Cost: ¥3,700,000)
KeywordsDIRAC experiment / CERN PS212 / Non-perturbative QCD / Scattering length of pion / hadronic atom / Kπ atom / Scifi hodoscope / Silicon microstrip counter / π^-π^+原子 / Κπ原子 / PS212 / QCD / 二中間子原子 / カイラル摂動理論 / S波散乱波長 / CERN・PS
Research Abstract

The principal objective of this study is to carry out PS212 (DIRAC) experiment at CERN to test the non-perturbative QCD in the low-energy region. It is essential to test the theory experimentally to understand thoroughly the hadron interactions. Although is difficult to carry out reliable calculations in this region, the π-π scattering length is predicted with an exceptional precision, better than 2%. DIRAC experiment aims at measuring the pi-pi scattering length with a precision of 5% by measuring the life-time of the A_<2π> atom.
During the period of this project, the Japanese group pursued the experiment by improving the experimental setup. Parts of the experimental result have been already analyzed and published.
The collaboration undertakes a measurement of the life time of atoms formed with K and π by applying the same technique used in DIRAC. The production cross section of such atoms, however, is much smaller, and the measurement requires the development of detectors efficient in much larger beam intensities.
To solve the saturation problem of the current dE/dx counter, a fast silicon strip counter which allows a use in triggering is developed, and now it is ready. Also a scintillating fiber hodoscope using 0.28 mmΦ scintillator in stead of current 0.5 mmΦ one, and a fast readout system using F1-TDC have been developed. The detector has now an efficiency of 98%, spatial resolution of 64 μm together with a time resolution better than 500 ps, and it can be used as a tracking device as well as a triggering device.
With the development of these counters together with micro drift chamber developed by the Russian group, the detection of A_<Kπ> became possible, and the project to carry out this experiment as an extension of DIRAC has been approved in December 2005. A serious preparation is in progress.

Report

(5 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • Research Products

    (18 results)

All 2006 2005 2004 2003 2002 Other

All Journal Article (14 results) Publications (4 results)

  • [Journal Article] High resolution scintillating-fibre hodoscope and its readout using Peak-sensing algorithm2006

    • Author(s)
      A.Gorin et al.
    • Journal Title

      J.Phys.G : Nucl.Par.Phys. (印刷中)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] First measurement of the π^+ π^- atom lifetime2005

    • Author(s)
      B.Adeva et al.
    • Journal Title

      Phys.Letters B691

      Pages: 50-60

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] First measurement of the π^+π^- atom life time2005

    • Author(s)
      B.Adeva et al.
    • Journal Title

      Physics Letters B619

      Pages: 50-60

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] First measurement of the π^+π^- atom lifetime2005

    • Author(s)
      B.Adeva et al.
    • Journal Title

      Phys.Letters B619

      Pages: 50-60

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Detection of π^+ π^- atoms with the DIRAC sopectormeter at CERN2004

    • Author(s)
      B.Adeva et al.
    • Journal Title

      J.Phys,G : Nucl.Par.Phys. 30

      Pages: 1929-1946

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Detection of π^+π^- atoms with the DIRAC spectrometer at CERN2004

    • Author(s)
      B.Adeva et al.
    • Journal Title

      J.Phys.G : Nucl.Par.Phys. 30

      Pages: 1929-1946

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Detection of π^+ π^- atoms with the DIRAC spectrometer at CERN2004

    • Author(s)
      B.Adeva, et al.
    • Journal Title

      Journal of Physics G, Nucl.Part.Phys. 30

      Pages: 1929-1946

    • Related Report
      2004 Annual Research Report
  • [Journal Article] DIRAC : A higy resolution spectrometer for pionium detection2003

    • Author(s)
      B.Adeva et al.
    • Journal Title

      Nucl.Instr.and Meth.inPhys.Res. A515

      Pages: 467-496

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] DIRAC : A high resolution spectrometer for pionium detection2003

    • Author(s)
      B.Adeva et al.
    • Journal Title

      Nucl.Instr.and Meth.in Phys.Res.A 515

      Pages: 467-496

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] The multilevel trigger system of the DIRAC experiment2002

    • Author(s)
      L.Afanasyev et al.
    • Journal Title

      Nucl.Instr.and Meth.in Phys.Res. A491

      Pages: 376-389

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Silicon strip detector as a real-time,fast medium-segnmented hodoscope2002

    • Author(s)
      M.Kobayashi, et al.
    • Journal Title

      Nycl.Instr.and Meth.in Phys. Res. A487

      Pages: 353-364

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] The multilevel trigger system of the DIRAC experiment2002

    • Author(s)
      L.Afanasyev et al.
    • Journal Title

      Nucl.Instr.and Meth.in Phys.Res.A 491

      Pages: 376-389

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Silicon strip detector as a real-time, fast medium-segmented hodoscope2002

    • Author(s)
      M.Kobayashi, et al.
    • Journal Title

      Nucl.Instrum.Meth.in Phys.Res.A 487

      Pages: 353-364

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] High resolution scintillating-fibre hodoscope and its readout using Peak-sensing algorithm

    • Author(s)
      A.Gorin, et al.
    • Journal Title

      Nucl.Instrum.Meth.in Phys.Res. (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Publications] B.Adeva et al.: "DIRAC : A high resolution spectrometer for Pionium detection"Nucl.Instr.Meth.in Phys.Res.. A515. 467-496 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] L.Afanasyev et al.: "The multilevel trigger system of the DIRAC experiment"Nucl. Instr. Meth.. A491. 376-389 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Kobayashi et al.: "Silicon strip detector as a real-time, fast, medium-segmented hodoscope"Nucl. Instr. Meth.. A487. 353-364 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] F.Gomeg et al.: "DIRAC EXPERIMENT"Nucl. Phys. Proc. Suppl.. 96. 259-266 (2001)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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