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Introduction to the E391a

Introduction to the E391a. E391a Collaboration. High Energy Accelerator Research Organization, KEK, Japan J oint 　I nstitute for N uclear R esearch (Dubna), Russia Department of Physics, Kyoto University, Japan N ational D efense A cademy of J apan, Japan

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Introduction to the E391a

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  1. Introduction to the E391a

  2. E391a Collaboration High Energy Accelerator Research Organization, KEK, Japan Joint 　Institute for Nuclear Research (Dubna), Russia Department of Physics, Kyoto University, Japan National Defense Academy of Japan, Japan Department of Physics, National Taiwan University, Taiwan Department of Physics, Osaka University, Japan Department of Physics, Pusan National University, Korea Research Center for Nuclear Physics, Osaka University, Japan Faculty of Science and Engineering, Saga University, Japan Department of Physics, University of Chicago, USA Department of Physics, Yamagata University, Japan

  3. KLgp0nnphysics • Flavor Changing Neutral Current • Direct CP violation (Ds =1) 　　　Im(Vtd) measurement • Very small theoretical ambiguity 　　　Only top loop in SM clean and pure • Last frontier in K-decay challenging

  4. Experimental situation- Current and future -

  5. Mile stones • Dec.1996: conditionally approved • Mar.1999: constructed the beam line • July 2001: approved • Oct. 2002: engineering run • Nov.2003: middle section (last vacuum 　　　　　　　　　　chamber) arrived • 18 Feb. 2004: Started data taking

  6. Pencil Beam Detection Method • Pencil beam • Detector with complete veto system • 4p coverage with thick calorimeter • Wide acceptance • Double decay chamber • Operation in high vacuum • High PT selection • Step by step approach • KEK-PS E391a • JPARC Detector system

  7. Detector system

  8. Detector system (Cont.)

  9. Detector Integration Jan 22, 2004

  10. Calibration using cosmic rays

  11. KL p0p0 KL p0p0p0 Clearly reconstructed KL decay modes 6-g invariant mass (GeV/c2) 4-g invariant mass (GeV/c2)

  12. JPARC http://j-parc.jp/

  13. A-line plan at JPARC

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