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Precise test of low energy QCD by measuring scattering lengths of pi+ pi- atoms -Lamb shift measurement of long lived pi+ pi- atoms in advanced DIRAC experiment -

Research Project

Project/Area Number 24340058
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypePartial Multi-year Fund
Section一般
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionKyoto Sangyo University

Principal Investigator

OKADA Kenji  京都産業大学, 名誉教授 (90093385)

Co-Investigator(Kenkyū-buntansha) 岩下 芳久  京都大学, 化学研究所, 准教授 (00144387)
千葉 雅美  首都大学東京, 理工学研究科, 客員研究員 (60128577)
外山 政文  京都産業大学, コンピュータ理工学部, 教授 (60180189)
神谷 好郎  東京大学, 素粒子物理国際研究センター, 助教 (90434323)
青垣 総一郎  京都産業大学, コンピュータ理工学部, 講師 (00582363)
Co-Investigator(Renkei-kenkyūsha) KOBAYASHI Masaaki  高エネルギー加速器研究機構, 素粒子原子核研究所, 名誉教授 (40013388)
Research Collaborator TAKEUTCHI Fujio  京都産業大学, 名誉教授
Project Period (FY) 2012-04-01 – 2017-03-31
Project Status Completed (Fiscal Year 2016)
Budget Amount *help
¥18,980,000 (Direct Cost: ¥14,600,000、Indirect Cost: ¥4,380,000)
Fiscal Year 2015: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2014: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2013: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2012: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Keywordsππ原子・πK原子 / ππ散乱長・πK散乱長 / ラムシフト / カイラル摂動計算 / 低エネルギー領域のQCD検証 / ππ原子・πK原子の寿命測定 / 準安定P状態 / CERN-PS加速器 / ππ原子 / ππ原子寿命測定 / ππ散乱長 / QCD / ππ原子準安定P状態 / πK原子 / ππ原子寿命 / 準安定 P状態 / 二中間子原子寿命 / DIRAC実験 / シュタルク効果
Outline of Final Research Achievements

After investigating the pi+pi- atom with the ground state lifetime of 3.15×10-15 s, the DIRAC spectrometer was upgraded in order to study simultaneously pi+pi- and piK atoms.
The experiment at the CERN PS observed for the first time long-lived states of the pi+pi- atoms. The number of pion pairs resulting from the breakup of long-lived pi+pi- atoms amounts to 436 ± 61, corresponding to sigma=7.1. This observation opens a new possibility to measure energy differences between P and S atomic states (Lamb-shift) and so to determine another combination of pi-pi scattering lengths. The piK atoms are produced by 24 GeV/c protons interacting with Pt or Ni foil targets. The breakup of piK atoms in the targets yields characteristic piK pairs with small relative momenta in the pair center of mass system. The experiment observed 349 ± 62 such atomic piK pairs, corresponding to sigma= 5.6. This is the first statistically significant observation of the strange dimesonic piK atom.

Report

(6 results)
  • 2016 Annual Research Report   Final Research Report ( PDF )
  • 2015 Annual Research Report
  • 2014 Annual Research Report
  • 2013 Annual Research Report
  • 2012 Annual Research Report
  • Research Products

    (28 results)

All 2016 2015 2014 2013 2012 Other

All Int'l Joint Research (12 results) Journal Article (11 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 7 results,  Open Access: 4 results,  Acknowledgement Compliant: 4 results) Presentation (1 results) (of which Int'l Joint Research: 1 results) Remarks (4 results)

  • [Int'l Joint Research] JINR, Dubna/IHEP, Protvino/Voronezh State University(ロシア連邦)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research] INFN, Sezione di Trieste Unit,Trieste/INFN, Laboratori Nazionali di Frascati(Italy)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research] IFIN-HH,, Bucharest(Romania)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research] CERN, Geneva/Zurich University, Zurich/Basel University(スイス)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research] Czech Technical University, Prague/Nuclear Physics Institute ASCR, Rez/Institute of Physics ASCR, Prague(チェコ)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research]

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research] JINR/IHEP/Moscow State Univ.(ロシア連邦)

    • Related Report
      2015 Annual Research Report
  • [Int'l Joint Research] INFN, Trieste and Messina Univ/INFN,Frascati(Italy)

    • Related Report
      2015 Annual Research Report
  • [Int'l Joint Research] IFIN-HH(Romania)

    • Related Report
      2015 Annual Research Report
  • [Int'l Joint Research] Albert Einstein Center Fund. Phys./CERN/Zurich Univ.(Switzerland)

    • Related Report
      2015 Annual Research Report
  • [Int'l Joint Research] Santiago de Compostela Univ.(Spain)

    • Related Report
      2015 Annual Research Report
  • [Int'l Joint Research]

    • Related Report
      2015 Annual Research Report
  • [Journal Article] Upgraded DIRAC spectrometer at CERN PS for the investigation of ππ and πK atoms2016

    • Author(s)
      B. Adeva, L. Afanasyev(2), S. Aogaki(6), M. Chiba(11), Y. Iwashita(30), V. Karpukhin(31), M. Kobayashi(33), L. Nemenov(44), K. Okada(46), A. Ryazantsev(54), F. Takeutchi(61) et al, (total 71)
    • Journal Title

      Nucl. Inst. And Meth. in Phys. Res. A

      Volume: A839 Pages: 52-85

    • DOI

      10.1016/j.nima.2016.07.049

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Observation of π-K+ and π+K- Atoms2016

    • Author(s)
      B. Adeva, L. Afanasyev(2), S. Aogaki(6), M. Chiba(10), Y. Iwashita(25),V. Karpukhin(26), M. Kobayashi(28), L. Nemenov(39), K. Okada (41), A. Ryazantsev(49), F. Takeutchi(55) et al, (total 64)
    • Journal Title

      Phys. Rev. Letters

      Volume: 117 Issue: 11 Pages: 1120011-6

    • DOI

      10.1103/physrevlett.117.112001

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] First observation of long-lived π+π- atoms2015

    • Author(s)
      B.Adeva, L.Afanasyev, S.Aogaki, M.Chiba, D.Drijard, O.Gorchakov, K.Gritsay, Y.Iwashita, V.Karpukhin, M.Kobayashi, L.Nemenov, K.Okada, M.Pentia, A.Ryazantsev, J.Schacher, F.Takeutchi, V.Yazkov, DIRAC collaboration(64 persons)
    • Journal Title

      Physics Letters B

      Volume: 751 Pages: 12-18

    • DOI

      10.1016/j.physletb.2015.09.060

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] First πK atom lifetime and πK scattering length measurements,2014

    • Author(s)
      DIRAC Collaboration, (B. Adeva, S.Aogaki, M.Chiba, Y.Iwashita, V.Karpukhin, M.Kobayashi, L.Nemenov, K.Okada, F.Takeutchi, 69peoples)
    • Journal Title

      Physics Letters B

      Volume: 735 Pages: 288-294

    • DOI

      10.1016/j.physletb.2014.06.043

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] First πK atom lifetime and πK scattering length measurements2014

    • Author(s)
      B. Adeva, L. Afanasyev, Y. Allkofer, C. Amsler, A. Anania, S.Aogaki(6), A. Benelli, V.Brekhovskikh, T. Cechak, M. Chiba(10), …,Y. Iwashita(28),... L. Nemenov(42), M. Nikitin, K. Okada(44), ..., F. Takeutchi(59),(total68)
    • Journal Title

      CERN Document Server(cds.ch)

      Volume: CERN-PH-EP-2014-030 Pages: 1-12

    • Related Report
      2013 Annual Research Report
  • [Journal Article] Performance test of the new dE/dx counter in the DIRAC beam line2013

    • Author(s)
      S. Aogaki, M. Chiba, K. Okada and F. Takeutchi
    • Journal Title

      京都産業大学先端科学技術研究所所報

      Volume: 第12号 Pages: 9-20

    • NAID

      110009623862

    • Related Report
      2013 Annual Research Report
  • [Journal Article] CERN PSにおけるDIRAC実験(PS212)用dE/dx検出器の宇宙線を用いた性能評価2013

    • Author(s)
      青垣総一郎、岡田憲志、竹内富士雄
    • Journal Title

      京都産業大学先端科学技術研究所所報

      Volume: 第12号 Pages: 1-8

    • NAID

      110009623861

    • Related Report
      2013 Annual Research Report
  • [Journal Article] Search for neutrino-less double beta decay by CANDLES2013

    • Author(s)
      S. Umehara , T. Kishimoto, M. Nomachi, S. Yoshida, S. Ajimura, K. Suzuki, K. Ichimura, K. Matsuoka, N. Nakatani,…., K. Fushimi, R. Hazama, H. Ohsumi and K. Okada(29)
    • Journal Title

      AIP Conf. Proc.

      Volume: 1533 Pages: 115-120

    • DOI

      10.1063/1.4806786

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A permanent magnet to search for long-lived π+π- atoms.2012

    • Author(s)
      S. Aogaki, M.Chiba, Y.Iwashita, M.Kobayashi, K.Okada, F. Takeutchi
    • Journal Title

      先端科学技術研究所所報

      Volume: 11 Pages: 41-55

    • Related Report
      2012 Annual Research Report
  • [Journal Article] Study of Ca-48 double beta decay by CANDLES CANDLES Collaboration2012

    • Author(s)
      I. Ogawa (Fukui U.), T. Kishimoto (Osaka U. & Osaka U., Res. Ctr. Nucl. Phys.) , S. Umehara (Osaka U., Res. Ctr. Nucl. Phys.) , G. Ito, K. Yasuda, H. Kakubata, M. Miyashita, K. Takubo, K. Matsuoka, M. Nomachi, M. Saka, K. Seki (Osaka U.) , K. Fushimi (Tok
    • Journal Title

      J.Phys.Conf.Ser.

      Volume: 375 Issue: 4 Pages: 42018-42018

    • DOI

      10.1088/1742-6596/375/1/042018

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Search for neutrino-less double beta decay with CANDLES2012

    • Author(s)
      S. Umehara
    • Journal Title

      AIP Conf. Proc.

      Volume: 1441 Pages: 448-450

    • DOI

      10.1063/1.3700581

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Presentation] First observation of π-K+ and π+K- atoms, their lifetime measurement and πK scattering length evaluation2016

    • Author(s)
      L. Afanasyev
    • Organizer
      38th Int. Conf. on High Energy Physics
    • Place of Presentation
      Chicago, USA
    • Year and Date
      2016-08-03
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Remarks] Welcome to DIRAC

    • URL

      http://dirac.web.cern.ch/DIRAC/

    • Related Report
      2016 Annual Research Report
  • [Remarks] Collaboration DIRAC

    • URL

      http://dirac.web.cern.ch/DIRAC

    • Related Report
      2015 Annual Research Report
  • [Remarks] Collaboration DIRAC

    • URL

      http://dirac.web.cern.ch/DIRAC/

    • Related Report
      2014 Annual Research Report
  • [Remarks]

    • URL

      http://dirac.web.cern.ch/DIRAC/

    • Related Report
      2012 Annual Research Report

URL: 

Published: 2012-04-24   Modified: 2022-02-16  

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