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2011 Fiscal Year Final Research Report

Search for flavor mixing and new physics with K_L→π^0νν^^- decay

Planned Research

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Project AreaNew Developments of Flavor Physics
Project/Area Number 18071006
Research Category

Grant-in-Aid for Scientific Research on Priority Areas

Allocation TypeSingle-year Grants
Review Section Science and Engineering
Research InstitutionOsaka University

Principal Investigator

YAMANAKA Taku  大阪大学, 大学院・理学研究科, 教授 (20243157)

Co-Investigator(Kenkyū-buntansha) KOMATSUBARA Takeshi  高エネルギー加速器研究機構, 素粒子原子核研究所, 教授 (30242168)
NANJO Hajime  京都大学, 大学院・理学研究科, 助教 (40419445)
TAJIMA Yasuhisa  山形大学, 学術情報基盤センター, 准教授 (50311577)
SUZUKI Shiro  佐賀大学, 理工学部, 教授 (50089851)
MATSUMURA Toru  防衛大学校, 応用科学群, 助教 (00545957)
SASAO Noboru  京都大学, 大学院・理学研究科, 教授 (10115850)
YOSHIDA Kouji  山形大学, 学術基盤センター, 准教授 (80241727)
Co-Investigator(Renkei-kenkyūsha) INAGAKI Takao  高エネルギー加速器研究機構, 素粒子原子核研究所, 教授 (60044757)
LIM Geiyoub  高エネルギー加速器研究機構, 素粒子原子核研究所, 准教授 (90332113)
WATANABE Hiroaki  高エネルギー加速器研究機構, 素粒子原子核研究所, 助教 (00415043)
NOMURA Tadashi  高エネルギー加速器研究機構, 素粒子原子核研究所, 准教授 (10283582)
TOGAWA Manabu  大阪大学, 大学院・理学研究科, 助教 (50455359)
Project Period (FY) 2006 – 2011
KeywordsCP対称性の破れ / K中間子 / 稀崩壊 / 大強度陽子加速器 / J-PARC
Research Abstract

We set an upper limit of BR<2.6×10^<-8> (90% CL) on the branching ratio of the CP violating K_L→π^0νν^^- decay based on the data taken at KEK. We also built a new beam line and detector components for the J-PARC high intensity proton accelerator to search for the effect of new physics with a sensitivity close to the branching ratio predicted by the standard model.

  • Research Products

    (28 results)

All 2012 2011 2010 2009 2008 2007 2006 Other

All Journal Article (12 results) (of which Peer Reviewed: 12 results) Presentation (14 results) Book (1 results) Remarks (1 results)

  • [Journal Article] Measurement of K^0_L flux at the J-PARC Neutral-Kaon Beam Line2012

    • Author(s)
      K. Shiomi, T. K. Komatsubara, H. Nanjo, Y. Tajima, T. Yamanaka, et al.
    • Journal Title

      Nucl Inst. Meth. A

      Volume: 664 Pages: 264-271

    • URL

      http://dx.doi.org/doi:10.1016/j.nima.2011.11.010

    • Peer Reviewed
  • [Journal Article] Development of a Neutral Beam Profile Monitor2011

    • Author(s)
      G. Takahashi, T. K. Komatsubara, H. Nanjo, Y. Tajima, T. Yamanaka, et al.
    • Journal Title

      JJAP

      Volume: 50 Pages: 036701

    • URL

      http://dx.doi.org/doi:10.1143/JJAP.50.036701

    • Peer Reviewed
  • [Journal Article] Rare Kaon and Pion Decays : Incisive Probes for New Physics Bound to the Standard Model2011

    • Author(s)
      D. Bryman, W. J. Marciano, R. T. Tschirhart, and T. Yamanaka
    • Journal Title

      Ann. Rev. Nucl. Part. Sci.

      Volume: 61 Pages: 331

    • URL

      http://dx.doi.org/doi:10.1146/annurev-nucl-102010-130431

    • Peer Reviewed
  • [Journal Article] Study of the K^0_L→π^0π^0νν^^- decay2011

    • Author(s)
      R. Ogata, T. K. Komatsubara, T. Matsumura, H. Nanjo, Y. Tajima, T. Yamanaka, et al. (E391a Collaboration)
    • Journal Title

      Phys. Rev. D

      Volume: 84 Pages: 052009

    • URL

      http://dx.doi.org/doi:10.1103/PhysRevD.84.052009

    • Peer Reviewed
  • [Journal Article] Experimental Study of the Decay K_L→π^0νν^^-2010

    • Author(s)
      J. K. Ahn, T. K. Komatsubara, H. Nanjo, S. Suzuki, Y. Tajima, T. Yamanaka, H. Morii, et al.
    • Journal Title

      Phys. Rev. D

      Volume: 81 Pages: 072004

    • URL

      http://dx.doi.org/doi:10.1103/PhysRevD.81.072004

    • Peer Reviewed
  • [Journal Article] Testing the CKM Model with Kaon Experiments2009

    • Author(s)
      E. Blucher, B. Winstein and T. Yamanaka
    • Journal Title

      Prog. Theo. Phys.

      Volume: 122 Pages: 81

    • URL

      http://dx.doi.org/doi:10.1143/PTP.122.81

    • Peer Reviewed
  • [Journal Article] Search for a Light Pseudoscalar Particle in the Decay K^0_L→π^0π^0X2009

    • Author(s)
      Y. C. Tung, T. K. Komatsubara, H. Nanjo, S. Suzuki, Y. Tajima, T. Yamanaka, et al.
    • Journal Title

      Phys. Rev. Lett.

      Volume: 102 Pages: 051802

    • URL

      http://dx.doi.org/doi:10.1103/PhysRevLett.102.051802

    • Peer Reviewed
  • [Journal Article] B, D and K decays2008

    • Author(s)
      G. Buchalla, T. K. Komatsubara, F. Muheim, L. Silvestrini, et al.
    • Journal Title

      Eur. Phys. J. C

      Volume: 57 Pages: 309-492

    • URL

      http://dx.doi.org/doi:10.1140/epjc/s10052-008-0716-1

    • Peer Reviewed
  • [Journal Article] Search for the Decay K_L→π^0νν^^-2008

    • Author(s)
      J. K. Ahn, T. Sumida, T. K. Komatsubara, H. Nanjo, S. Suzuki, Y. Tajima, T. Yamanaka, et al.
    • Journal Title

      Phys. Rev. Lett.

      Volume: 100 Pages: 201802

    • URL

      http://dx.doi.org/doi:10.1103/PhysRevLett.100.201802

    • Peer Reviewed
  • [Journal Article] Barrel Photon Detector of the KEK K_L→π^0νν^^- Experiment2008

    • Author(s)
      Y. Tajima, T. K. Komatsubara, T. Yamanaka
    • Journal Title

      Nucl. Inst. Meth. A

      Volume: 592 Pages: 261-272

    • URL

      http://dx.doi.org/doi:10.1016/j.nima.2008.04.080

    • Peer Reviewed
  • [Journal Article] First Search for K_L→π^0π^0νν^^-2007

    • Author(s)
      J. Nix, T. K. Komatsubara, S. Suzuki, Y. Tajima, T. Yamanaka, et al.
    • Journal Title

      Phys. Rev. D

      Volume: 76 Pages: 011101(R)

    • URL

      http://dx.doi.org/doi:10.1103/PhysRevD.76.011101

    • Peer Reviewed
  • [Journal Article] New Limit on the K_L→π^0νν^^- Decay Rate2006

    • Author(s)
      J. K. Ahn, T. Inagaki, T. K. Komatsubara, G. Y. Lim, N. Sasao, H. Watanabe, M. Yamaga, T. Yamanaka, et al.
    • Journal Title

      Phys. Rev. D

      Volume: 74 Pages: 051105(R)

    • URL

      http://dx.doi.org/doi:10.1103/PhysRevD.74.051105

    • Peer Reviewed
  • [Presentation] Experiments with K-Meson Decays2012

    • Author(s)
      Takeshi Komatsubara
    • Organizer
      KEK Flavor Factory Workshop (KEK-FF2012)
    • Place of Presentation
      KEK, Japan
    • Year and Date
      20120308-10
  • [Presentation] Kaon Experiments in Japan : J-PARC KOTO2011

    • Author(s)
      Taku Yamanaka
    • Organizer
      Fundamental Physics at the Intensity Frontier
    • Place of Presentation
      Rockville MD, USA
    • Year and Date
      20111130-1202
  • [Presentation] J-PARC Flavor Program2011

    • Author(s)
      Tadashi Nomura
    • Organizer
      Flavor Physics and CP Violation 2011
    • Place of Presentation
      Kibbuts Maale Hachamisha, Israel
    • Year and Date
      20110523-27
  • [Presentation] The new K_L→π^0νν^^- experiment (KOTO) at J-PARC2010

    • Author(s)
      Hiroaki Watanabe
    • Organizer
      ICHEP2010
    • Place of Presentation
      Paris, France
    • Year and Date
      20100722-28
  • [Presentation] Kaon Experiments at J-PARC2010

    • Author(s)
      Gei-Youb Lim
    • Organizer
      BEACH 2010 -IX International Conference on Hyperons, Charm and Beauty Hadrons
    • Place of Presentation
      Perugia, Italy
    • Year and Date
      20100621-26
  • [Presentation] KEK-PS E391a実験におけるK_L→π^0νν^^-崩壊モード探索の最終結果2010

    • Author(s)
      森井秀樹
    • Organizer
      日本物理学会第65回年次大会
    • Place of Presentation
      岡山大学
    • Year and Date
      20100320-23
  • [Presentation] Status of the J-PARC E14 Experiment for the K_L→π^0νν^^-2009

    • Author(s)
      Taku Yamanaka
    • Organizer
      WIN'09-Weak Interactions and Neutrinos
    • Place of Presentation
      Perugia, Italy
    • Year and Date
      20090914-19
  • [Presentation] Lower power PMT base for KOTO experiment using Cockcroft-Walton circuit2009

    • Author(s)
      Takahiko Masuda
    • Organizer
      PIC2009-XXXIX Physics In Collision
    • Place of Presentation
      Kobe, Japan
    • Year and Date
      20090830-0902
  • [Presentation] Kaons-Recent Results and Future Plans2009

    • Author(s)
      Takeshi Komatsubara
    • Organizer
      Lepton Photon 2009-XXIV International Symposium on Lepton Photon Interactions at High Energies
    • Place of Presentation
      Hamburg, Germany
    • Year and Date
      20090817-22
  • [Presentation] J-PARC E14 KOTO Experiment for K_L→π^0νν^^-2009

    • Author(s)
      Hajime Nanjo
    • Organizer
      KAON 2009
    • Place of Presentation
      Tsukuba, Japan
    • Year and Date
      20090609-12
  • [Presentation] Reach of Future Kaon Efforts2008

    • Author(s)
      Tadashi Nomura
    • Organizer
      FPCP08-Flavor Physics and CP Violation
    • Place of Presentation
      Taipei, Taiwan
    • Year and Date
      20080505-09
  • [Presentation] KEK-PS E391a実験におけるK_L→π^0νν^^-崩壊の探索2008

    • Author(s)
      隅田土詞
    • Organizer
      日本物理学会第63回年次大会
    • Place of Presentation
      近畿大学
    • Year and Date
      20080322-26
  • [Presentation] J-PARC2007

    • Author(s)
      Taku Yamanaka
    • Organizer
      Workshop on Physics with a High Intensity Proton Source
    • Place of Presentation
      Fermilab, USA.
    • Year and Date
      20071116-17
  • [Presentation] Flavor Physics at J-Parc2006

    • Author(s)
      Taku Yamanaka
    • Organizer
      CKM2006-4th International Workshop on CKM Unitarity Triangle
    • Place of Presentation
      Nagoya, Japan(Plenary talk)
    • Year and Date
      20061212-16
  • [Book] K中間子, 素粒子物理学ハンドブック(山田作衛、相原博昭、岡田安弘、坂井典祐、西川公一郎編), ISBN978-4-254-131000-0)2010

    • Author(s)
      山中卓
    • Total Pages
      343-354
    • Publisher
      朝倉書店
  • [Remarks]

    • URL

      http://koto.kek.jp/

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Published: 2013-07-31   Modified: 2024-10-04  

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