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Concluding Remarks

Concluding Remarks. L. Littenberg - BNL K-Rare Decays Frascati - 27 May 05. Isidori Arguments. Motivation, c’d. K  & MSSM. Contribution of K  after LHC. E949. E787/949 Events. E949 Event. Products of E787/949. SPI measurements. Analysis methods. J-PARC K +  +  LOI.

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Concluding Remarks

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  1. Concluding Remarks L. Littenberg - BNL K-Rare Decays Frascati - 27 May 05

  2. Isidori Arguments

  3. Motivation, c’d

  4. K & MSSM

  5. Contribution of K after LHC

  6. E949

  7. E787/949 Events E949 Event

  8. Products of E787/949 SPI measurements Analysis methods

  9. J-PARC K++ LOI • Stopped K+ experiment • Builds on E787/949 experience • Lower energy separated beam • Higher B spectrometer • More compact apparatus • Better resolution • Finer segmentation • Improved  veto (crystal barrel) • Aims for 50 events • Not an early experiment for J-PARC • Needs beamline • place on the floor • $ for detector

  10. K decay at rest • Decades of experience • Bckgnd <1.5 x 10-11 • Almost everything well-understood • Can confidently scale in most parameters • Biggest questions are money and will • Need appropriate beamline • Need better duty cycle • Need funding for detector • Need collaboration • Couldbe sure of ~50 SM events, maybe 100 if pnn2 region can be used

  11. NA48/3

  12. NA48/3 • Ambitious in-flight attempt to get ~65 SM events with good S:B • Benefits from several years of thought (CKM, etc.) • Brute force approach to beam • Needs some development of techniques • Has reasonable toolset • Equiv p* resolution 1.3 MeV/c (c.f. 2.3 for E949) • Redundant background rejection methods • Benefit of decay in vacuum, high energy • Concerns • There’s always a beam pion • Unanticipated background

  13. E391a KL0

  14. po produced at CC02 po produced at CV (?) KL popopo KL p+p-po KL  popo KL gg Confronting the Enemy Run 1 expected s.e.s ~ 10-8, expected BG ~310-9

  15. Responding to experience Run I  Run 2  Run 3 • Neutron background much reduced, now confronting KL decay contribution • Confident they can reduce the background to < 10-9

  16. Products of E381a Beam design & MC proofing Photonuclear SPI measurements Charged particle inefficency measurements

  17. E391a to J-PARC 50 more KL Thicker photon vetoes Deeper, more granular crystals Faster electronics Goal: 40 evts in 3 years, starting in 2009?, S:B ~ 1

  18. J-PARC KL - Part II Evts 3 options: 180 60 290

  19. KLOD IHEP 60 GeV proton beam - take off at 35 mr KL’s peak at ~6 GeV/c Aim to get 28 events/9 background in 3 years Could be ready to run in 2008?

  20. KOPIO

  21. Kinematic Separation of Signal and Backgrounds Signal Backgrounds

  22. Charged particle ineff. measurements KOPIO Products 3rd generation shashliyk Accelerator R&D Bomb detection

  23. Future History K+ SM KL

  24. K & Ke+e- • Could enhanced endpoint of K show up in Ke+e-? • With UC, predicted BR at endpoint predicted as ~10-8 • That part of Ke+e- maybe 3 larger. •  gives K  Ke+e- maybe 400 times smaller. • In amplitude 20 times smaller • Could be 10% effect in interference?

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