1. June 2000Status of BELLE1 Beyond 10 34 e + e - Workshop The Homestead Glen Arbor, MI Daniel Marlow BELLE Princeton University June 17, 2000

2. June 2000Status of BELLE2 Initial Physics Goal Our principal physics goal is to test the KM picture of CP violation by measuring the angle (aka ) of the unitarity triangle. In phase II, we will seek to measure and ( ).

3. June 2000Status of BELLE3 Existing Constraints Existing measurements of mixing and limit the allowed region in the plane. F. Parodi et al.

4. June 2000Status of BELLE4 The Measurement tag CP Need to: Measure momenta ID leptons & K’s Measure vertices

5. June 2000Status of BELLE5 The Measurement The time-dependent asymmetry appears mainly as a mean shift in the distribution between events tagged as decays and events tagged as decays.

6. June 2000Status of BELLE6 The KEK-B Asymmetric Collider KEK-B is similar to PEP- II in many ways, although there is a (potentially) important difference in the way in which the beams are brought into collision.

7. June 2000Status of BELLE7 Recent Run Snapshot Snapshot chosen at randomly selected time.

8. June 2000Status of BELLE8 Daily Luminosity History pb -1 /day pb -1 date 80 pb -1 /day 4.5 fb -1 total

9. June 2000Status of BELLE9 The Magnet

10. June 2000Status of BELLE10 About 10 Countries, 50 Institutes, & 300 People The BELLE Collaboration

11. June 2000Status of BELLE11 The Silicon Vertex Detector (SVD) Sensors: HPK DS640 (DSSD’s) Readout: VA1 chip from IDEAS

12. June 2000Status of BELLE12 SVD Performance CDC/SVD Track Matching:

13. June 2000Status of BELLE13 CDC Performance (Cosmic Rays)

14. June 2000Status of BELLE14 CDC Performance

15. June 2000Status of BELLE15 Particle ID (dE/dx, ToF, & Aerogel)

16. June 2000Status of BELLE16 CsI EM Calorimeter Performance

17. June 2000Status of BELLE17 Muon Detection Note that there are no missing hits in the layers of the muon system, except at the sector edges, where there is support structure.

18. June 2000Status of BELLE18 Detection

19. June 2000Status of BELLE19 Inclusive Electron Spectrum

20. June 2000Status of BELLE20 Beam Constrained Mass

21. June 2000Status of BELLE21 D 0 Mass Plot 1.80 1.84 1.86 1.90 To warm up our analysis machinery, we have studied charm lifetimes.

22. June 2000Status of BELLE22 D 0 Lifetime 1000 3000 -1000 -3000 1000 3000 -1000 -3000

23. June 2000Status of BELLE23 D S Lifetimes

24. June 2000Status of BELLE24 Dilepton Mass Spectra

25. June 2000Status of BELLE25 Exclusive Mode Reconstruction

26. June 2000Status of BELLE26 Exclusive Mode Reconstruction

27. June 2000Status of BELLE27 Exclusive Mode Reconstruction MC: histogram Data: points

28. June 2000Status of BELLE28 Reconstruction The mode represents a background to the more interesting Cabbibo suppressed mode

29. June 2000Status of BELLE29 Reconstruction Particle ID is an effective tool in pulling the signal out from underneath the background. Kaon probability

30. June 2000Status of BELLE30 Reconstruction Particle ID is an effective tool in pulling the signal out from underneath the background.

31. June 2000Status of BELLE31 Neutral B Mixing

32. June 2000Status of BELLE32 B Mixing

33. June 2000Status of BELLE33 Summary and Conclusions BELLE has accumulated 4.5 fb -1 of luminosity in its first ~year of operation. The detector is working well and the analysis machinery is beginning to produce results that are competitive with previous measurements. One can hope for further increases in luminosity in the months to come.