Test of QCD by measuring a lifetime ofπK atoms-Extended DIRAC-

• Project/Area Number: 20340059
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Kyoto Sangyo University
• Principal Investigator: OKADA Kenji 京都産業大学, コンピュータ理工学部, 教授 (90093385)
• Co-Investigator(Kenkyū-buntansha): TAKEUTCHI Fujio 京都産業大学, 名誉教授 (40121537) ; CHIBA Masami 首都大学東京, 理工学研究科, 助教 (60128577) ; IWASHITA Yoshihisa 京都大学, 化学研究所, 准教授 (00144387) ; AOGAKI Souichirou 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)
• Project Period (FY): 2008 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000); Fiscal Year 2011: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000); Fiscal Year 2010: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000); Fiscal Year 2009: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000); Fiscal Year 2008: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
• Keywords: 2中間子原子 / QCD / S.波散乱長 / カイラル摂動計算 / ππ原子 / πK原子崩壊寿命 / シンチレーティングファイバーホドスコープ / Kπ原子 / Kπ原子寿命 / Kπ散乱長 / DIRAC実験 / SciFiホドスコープ / π^+π^-原子 / πK原子 / ππ散乱長 / πK散乱長 / 二中間子原子寿命 / DIRAC experiment / QCDの検証 / ππ原子寿命 / ラムシフト / パイ散乱長 / Exotic atoms / scattering length / カイラル摂動

Research Abstract

The study presents an evidence for the first observation of electromagnetically boundπ^±K^<-+-> pairs(πK-atoms) with the DIRAC experiment at the CERN-PS. The observed enhancement at low relative momentum corresponds to the production ofπK-atoms. The mean life ofπK-atoms is related to the s-waveπK-scattering lengths. We got a lower limit for the mean life of 0. 8 fs at 90% confidence level.

Research Products

• [Journal Article] Determination ofππscattering lengths from measurement ofπ^+π^-atom lifetime (2011)
  • Author(s): B. Adeva, M. Chiba(9番目), M. Kobayashi(36番目), K. Okada(59番目), F. Takeutchi(80番目), (他90名)
  • Journal Title: Phys. Lett Volume: B704 Issue: 1-2 Pages: 24-29
  • DOI: 10.1016/j.physletb.2011.08.074
  • Peer Reviewed
• [Journal Article] DIRAC実験におけるπK原子の検出とその寿命測定 (2011)
  • Author(s): 青垣総一郎、岡田憲志、竹内富士雄、千葉雅美、岩下芳久、小林正明
  • Journal Title: 京都産業大学先端科学技術研究所所報 Volume: 第10号 Pages: 75-75
  • NAID: 110008731041
• [Journal Article] CERN PSにおけるDIRAC実験(PS212)用dE/dx検出器用プラスチックシンチレータの性能評価 (2011)
  • Author(s): 青垣総一郎
  • Journal Title: 京都産業大学先端科学技術研究所所報 Volume: 第10号 Pages: 63-73
  • NAID: 110008731038
• [Journal Article] Satellite pulsed tiny neutron source at Kyoto University (2011)
  • Author(s): Y. Iwashita, T. Nagae, T. Tanimori, H. Fujioka, H. M. Shimizu
  • Journal Title: Nucl. Instr. Meth Volume: A634 Issue: 1 Pages: S97-S99
  • DOI: 10.1016/j.nima.2010.06.356
  • Peer Reviewed
• [Journal Article] Determination of ππ scattering lengths from measurement of π^+π^- atom lifetime (2011)
  • Author(s): B.Adeva, et al, The DIRAC collab
  • Journal Title: Phys.Letters B Volume: 704 Pages: 24-29
  • Peer Reviewed
• [Journal Article] DIRAC実験におけるπK原子の検出とその寿命測定 (2011)
  • Author(s): 青垣総一郎、岡田憲志, ほか4名
  • Journal Title: 京都産業大学先端科学技術研究所所報 Volume: 第10号 Pages: 75-84
  • NAID: 110008731041
• [Journal Article] CERN PSにおけるDIRAC実験用dE/dx検出器用プラスチックシンチレータの性能評価 (2011)
  • Author(s): 青垣総一郎
  • Journal Title: 京都産業大学先端科学技術研究所所報 Volume: 第10号 Pages: 63-73
• [Journal Article] Performance of a 511keV Gamma-ray Imager Using a LYSO(Ce) Crystal Array with Wave-Length Shifter (2010)
  • Author(s): S. Aogaki and F. Takeutchi
  • Journal Title: IEEE Trans. Nucl. Sci Volume: 57 Issue: 3 Pages: 1502-1511
  • DOI: 10.1109/tns.2010.2043853
  • Peer Reviewed
• [Journal Article] Read-out of LYSO : Ce matrix detector using wave-length-shifter fivers applicable to new PET scanner with high spatial resolution at low cost (2010)
  • Author(s): S. Aogaki and F. Takeutchi
  • Journal Title: 京都産業大学先端科学技術研究所所報 Volume: 第9号 Pages: 35-58
• [Journal Article] Practical applications of permanent magnet multipoles (2010)
  • Author(s): Y. Iwashita(1番目), M. Ichikawa
  • Journal Title: IEEE Trans. Applied Supercond Volume: 20 Issue: 3 Pages: 842-845
  • DOI: 10.1109/tasc.2010.2040604
  • Peer Reviewed
• [Journal Article] Performance of a 511keV gamma-ray imager using a LYSO(Ce) crystal array with wave length shifter. (2010)
  • Author(s): S.Aogaki, F.Takeutchi
  • Journal Title: IEEE Trans.Nucl.Sci. 57 Pages: 1502-1511
  • Peer Reviewed
• [Journal Article] Measurement of 0.511MeV gamma-rays with a thin long strip of Gd_2SiO_5 : Ce3^+ scintillator. (2010)
  • Author(s): S.Aogaki, A.Isogai, M.Kobayashi, S.Sugimoto, F.Takeutchi, Y.Tamagawa
  • Journal Title: Nucl.Instr.Meth. A614 Pages: 250-259
  • Peer Reviewed
• [Journal Article] Practical applications of permanent magnet multipoles (2010)
  • Author(s): Y.Iwashita, M.Ichikawa, 他11名
  • Journal Title: IEEE Trans.Appl.Supercond. 20 Pages: 842-845
  • Peer Reviewed
• [Journal Article] Measurement of 0.511 MeV g-rays with a thin long strip of Gd2SiO5:Ce3+ scintillator (2010)
  • Author(s): S.Aogaki, et.al
  • Journal Title: Nuclear Inst.And Methods in Phys. Res., A Volume: 614 Pages: 250-259
  • Peer Reviewed
• [Journal Article] Performance of a 511keV gamma-ray imager using a LYSO(Ce) crystal array with wave-length shifter (2010)
  • Author(s): S Aogaki, F Takeutchi
  • Journal Title: IEEE trans.Nuclear Science Volume: 57 Pages: 1502-1511
  • Peer Reviewed
• [Journal Article] Practical Applications of Permanent Magnet Multipoles (2010)
  • Author(s): Y.Iwashita, et.al.
  • Journal Title: IEEE Trans.on Applied Supercond. Volume: 20 Pages: 842-845
  • Peer Reviewed
• [Journal Article] Measurement of 0.511 MeV g-rays with a thin long strip of Gd2SiO5 : Ce3+scintillator (2010)
  • Author(s): S.Aogaki, et.al
  • Journal Title: Nuclear Inst.And Methods in Phys.Res., A 614 Pages: 250-259
  • Peer Reviewed
• [Journal Article] Performance of a 511keV gamma-ray imager using a LYSO(Ce)crystal array with wave-length shifter (2010)
  • Author(s): S Aogaki, F Takeutchi
  • Journal Title: IEEE trans.Nuclear Science 2月に受理(未定)
  • Peer Reviewed
• [Journal Article] Measurement of 0. 511 MeV gamma-rays with a thin long strip of Gd2SiO5 : Ce3+scintillator (2009)
  • Author(s): S. Aogaki, S. Isogai, M. Kobayashi, S. Sugi moto, F. Takeutchi and Y. Tamagawa
  • Journal Title: Nucl. Instr. Meth Volume: A614 Issue: 2 Pages: 250-259
  • DOI: 10.1016/j.nima.2009.12.041
  • Peer Reviewed
• [Journal Article] Evidence forπK-atoms with DIRAC (2009)
  • Author(s): B. Adeva, M. Chiba(10番目), M. Kobayashi(34番目), K. Okada(52番目), F. Takeutchi(69番目)
  • Journal Title: Physics Letters Volume: B 674 Issue: 1 Pages: 11-16
  • DOI: 10.1016/j.physletb.2009.03.001
  • Peer Reviewed
• [Journal Article] 低価格高分解能PET制作を目的としたガンマ線イメージャー (2009)
  • Author(s): 青垣総一郎、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8号 Pages: 27-48
• [Journal Article] Rader for salt ultra-high-energy neutrino detector and contribution of W-gluon fusion process to collision of neutrinos against protons (2009)
  • Author(s): M. Chiba(1番目), Y. Arakawa, (他10名)
  • Journal Title: Nucl. Instr. Meth Volume: A604 Issue: 1-2 Pages: S233-S235
  • DOI: 10.1016/j.nima.2009.03.066
  • Peer Reviewed
• [Journal Article] A small angle neutron scattering(SANS) experiment using very cold neutrons(VCN) (2009)
  • Author(s): M. Bleuel, Y. Iwashita(7番目), (他9名)
  • Journal Title: Physica B, Elsevier Volume: 404 Issue: 17 Pages: 2629-2632
  • DOI: 10.1016/j.physb.2009.06.048
  • Peer Reviewed
• [Journal Article] Development of modulating permanent magnet sextupole lens for focusingof pulsed cold neutrons (2009)
  • Author(s): M. Yamada, Y. Iwashita(5番目), M. Ichikawa, (他22名)
  • Journal Title: Physica B, Elsevier Volume: 404 Issue: 17 Pages: 2646-2651
  • DOI: 10.1016/j.physb.2009.06.132
  • Peer Reviewed
• [Journal Article] Evidence for πK-atoms with DIRAC. (2009)
  • Author(s): B.Adeva, M.Chiba, M.Kobayashi, K.Okada, F.Takeutchi, 他75名
  • Journal Title: Phys.Letters B674 Pages: 11-16
  • Peer Reviewed
• [Journal Article] Evidence for pK-atoms with DIRAC (2009)
  • Author(s): B.Adeva, et.al
  • Journal Title: Physics Letters B 674 Pages: 11-16
  • Peer Reviewed
• [Journal Article] Evidence for πK-atoms with DIRAC (2009)
  • Author(s): B. Adeva, et. al
  • Journal Title: Physics Letters B 674 Pages: 11-16
  • Peer Reviewed
• [Journal Article] Depth of interaction measured with LYSO(Ce) scintillator in a new method (2008)
  • Author(s): S. Aogaki, H. Kotaka, I. Moritani and F. Takeutchi
  • Journal Title: 京都産業大学先端科学技術研究所所報 Volume: 第7号 Pages: 115-124
  • NAID: 110006952151
• [Journal Article] Study on the light insulator between scintillator crystals (2008)
  • Author(s): H. Kotaka, S. Aogaki, I. Moritani, F. Takeutchi and F. M. Toyama
  • Journal Title: 京都産業大学先端科学技術研究所所報 Volume: 第7号 Pages: 93-114
  • NAID: 110006951395
• [Journal Article] Variable permanent magnet sextupole lens for forcusing of pulsed cold neutrons (2008)
  • Author(s): Y. Iwashita(1番目), Y. Tajima, (他5名)
  • Journal Title: Nucl. Instr. Meth Volume: A586 Issue: 1 Pages: 73-76
  • DOI: 10.1016/j.nima.2007.11.058
  • Peer Reviewed
• [Journal Article] Study on the light insulator between scintillator crystals (2008)
  • Author(s): H.Kotaka,S.Aogaki, I.Moritani, F.Takeutchi, F.M.Toyama
  • Journal Title: 京都産業大学先端科学技術研究所所報 第7号 Pages: 93-114
  • NAID: 110006951395
• [Presentation] Performance of a 511keV gamma-ray imager using a LYSO(Ce) crystal array with wave-length shifter (2009)
  • Author(s): S. Aogaki, F. Takeutchi
  • Organizer: 10th Int. Conf. on Inorganic Scintillators and their Applications
  • Place of Presentation: 韓国済州道西帰浦市
  • Year and Date: 2009-06-10
• [Presentation] Performance of a 511keV gamma-ray imager using a LYSO(Ce)crystal array with wave-length shifter (2009)
  • Author(s): F Takeutchi
  • Organizer: 10th International Conference on Inorganic Scintillators and their Applications
  • Place of Presentation: 韓国済州道西帰浦市
  • Year and Date: 2009-06-10
• [Presentation] Investigation of pp and pK atoms at DIRAC (2009)
  • Author(s): V.Yazkov(DIRAC Collaboration)
  • Organizer: Proc.6th Int.Workshop on Chiral Dynamics 2009
  • Place of Presentation: Bern [Switzerland]
• [Presentation] Measurement of the pionium lifetime (2008)
  • Author(s): M.Zhabitsky(DIRAC Collaboration)
  • Organizer: 34th Int.Conf.on High Energy Physics
  • Place of Presentation: Philadelphia[USA]
• [Remarks]
  • URL: http://dirac.web.cern.ch/DIRAC/
• [Remarks]
  • URL: http://dirac.web.cern.ch/DIRAC/
• [Remarks]
  • URL: http://dirac.web.cern.ch/DIRAC/
• [Remarks]
  • URL: http://dirac.web.cern.ch/DIRAC/
• [Remarks]
  • URL: http://dirac.web.cern.ch/DIRAC/