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A test of QCD by measuring a life-time of hadoronic atoms.

Research Project

Project/Area Number 07454056
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 San-gyo University

Principal Investigator

TAKEUCHI Fujio  Kyoto San-gyo Univ., Dept.of Computer Sciences, Prof., 理学部, 教授 (40121537)

Co-Investigator(Kenkyū-buntansha) YOSHIDA Takuo  Osaka City College, Dept.of Physics, Associate Prof., 理学部, 助教授 (30220651)
OKADA Kenji  Kyoto San-gyo Univ., Dept.of Computer Sciences, Prof., 理学部, 教授 (90093385)
Project Period (FY) 1995 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥7,900,000 (Direct Cost: ¥7,900,000)
Fiscal Year 1997: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1996: ¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 1995: ¥3,200,000 (Direct Cost: ¥3,200,000)
KeywordsQuantum Chromo-Dynamics / Chiral Perturbation Theory / Hadoronic Atom / Topological trigger device / Scintillating fiber hodoscope / Position sensitive photomultiplier / Peak sensing circuit / DIRAC experiment (CERN-PS212) / シンチレーティングファイバホドスコープ / 位置検出型光電子増倍管 / ピークセンシング回路 / トポロジカルトリガー / シンチレーティングファイバー / QCD / カイラル対称性 / ダイメソニックアトム / 非摂動QCD / トポロジカルトリガーデバイス / ピークセンシングサ-キット / カイラル対称性の破れ
Research Abstract

A validity of QCD has not been proved yet at low energy region, where the interaction between quarks is too strong to be treated as a perturbation. The aim of this research is to test the QCD at an unperturbed low energy by measuring a life time of pionic atoms A_<2pi> (bound state of pi+pi-) with 10% accuracy. (DIRACCERN-PS212) The life time of A_<2pi> is related to the scattering length of pi-pi scattering in S-state and is preciesly predicted by a Chiral perturbation theory. To extract real rare A_<2pi> events from huge amount of background events experimentally, we have to develop a new type trigger device providing some topological information in the real time. The topological trigger device employed here consists of scintillating fiber hodoscopes (SCIFI) followed by position sensitive photo-multipliers (PSPM), peak sensing circuit (PSC) for a read-out device, and a trigger logic circuit (TLC) giving distances among multiple hit particles.
During 1995-1996, a scintillating fiber ho … More doscope and a peak sensing circuit were designed and prototypes of them were constructed. Their performances were tested by using high energy secondary particles produced by 24GeV protons. We measured such fundamental properties needed for our toporogical trigger device as an attenuation length of a scintillating fiber, a time resolution, an uniformity of pulse height distribution, cross talk among channels, a detection efficiency, an ability of multi-particle identification etc. At the same time, triggering patterns and triggering rates characteristic of the decay from the pionic atoms and those of competing background processes to be rejected were studied by a Monte Carlo simulation. Based on the simulation and the experimental results, the final design of the best suited triggering logic circuit was drawn.
In 1997, a complete set of a real size topological trigger device was constructed and tested the performance as a whole by using beam. The experimental results obtained from the trigger device were compared with the precise off-line analysis and/or the Monte Carlo simulation, and showed that the device can generate topological trigger signals with satisfactorily high performance in the event identification, time resolution, position resolution, triggering speed, detection efficiency, and partlicle multiplicity identification.
After the autumn in 1998, this trigger device will be used for thr DIRAC experiment as a second level trigger generator. Less

Report

(4 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • 1995 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] V.Agoritsas et al.: "Fast read-occt of scintillaling fiber arrays using position sensitive photo multipliers." Nucl,Instr. and Methods Phys.Res. A357. 78-86 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] V.Agoritsas et al.: "Scintillating fiber hodoscopes using position-sensitive photo multipliers." Nucl,Instr. and Methods Phys.Res. A372. 63-69 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] V.Agoritsas et al.: "Development of a scintillaling fiber dotector for fast topological triggers in ligh-liuminosity particle physics Experiments." Nucl,Inst. and Methods Phys.Res. (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] V.Agoritsas, N.Akchurin, A.M.Bergdolt, A.Bravar, O.Bing, J.Ditta, J.Dufornaud, R.Giacomich, A.M.Gorin, K.Kuroda, D.Magaudda, I.V.Manuilov, A.Michalowicz, C.Newsom, K.Okada, K.Okusawa., Y.Onel, A.Penzo, A.V.Riazantsev, V.I.Rykalin, G.Solvato, P.Schiavon, D.Sillou, F.Takeutchi, M.Tareb-Reyes and T.Yoshida: "Fast readout of scintillating fiber arrays using position-sensitive photomultipliers." Nucl.Instr.Meth.Phys Res. A357. 78-86 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] V.Agoritsas, N.Akohurin, O.Bing, A.Bravar, A.Cardini, B.Di Girolamo, J.Ditta, J., Dufournaud, V.Flaminio, A.M.Gorin, P.Khaustov, K.Kuroda, I.V.Manuilov, K.Okada, Y.Onel, A.Penzo, G.F.Rappazzo, A.V.Riazantsev, V.I.Rykalin, M.Sasaki, D.Sillou, F.Takeutchi, M.Tareb-Reyes and T.Yoshida: "Scintillating fiber hodoscopes using position-sensitive photomultipliers." Nucl.Inst.Meth.Phys.Res. A372. 63-69 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] M.Kobayashi and F.Takeutchi: "A test of QCD by a life-time measurement of pi+pi- atoms. (DIRAC)" High Energy News. Vol.16 nr.4. 85-93 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] V.Agoritsas, N.Akchurin, O.Bing, A.Bravar, A.Cardini, R.Drevenak, Mic.Finger, Mir.Finger, V.Flaminio, B.Di Girolamo, A.Gorin, A.Kulikov, K.Kuroda, I.Manuilov, K.Okada, Y.Onel, A.Penzo, D.Rapin, G.F.Rappazzo, A.Riazantsev, V.Rykalin, M.Slunecka, F.Takeutchi, S.Trusov, and T.Yoshida: "Development of a scintillating-fiber detector for fast topological triggers in high-luminosity particle physics experiments." Nucl.Inst.Meth.Phys.Res. A(to be published). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] V、Agoritsas et al.: "Read-out of scintillating fibers using a weak cross-talk position-sensitive photomultiplier." Nucl、Inst.Meth.in Phys.Research. (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] V、Agoritsas et al.: "Scintillating fiber hodoscopes using position-sensitive photomultipliers." Nucl、Inst.Meth.in Phys.Research. A327. 63-69 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] B.Bassalleck et.al.: "A multi-cell target for ΛΛhypernuclei Search." Nuclear Physics A. 585. 339c-340c (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] A.Rusek et al.: "Search for Strangelets and Other Rare Objects in Au+Pt Collisions at the AGS Using a Fixed-angle Focusing Spectrometer." Nuclear Physics A. 585. 59c-62c (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] V.Agoritsas: "Fast readout of scintillating fiberarray using PSPM." Nuclear Instruments and Methods A. 357. 78-86 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] V.Agoritsas: "Scintillating fiber hodoscope using position-sensitive photomu Hipliers." Nuclear Instruments and Methods A. 372. 63-69 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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