1. Italian Physical Society International School of Physics “Enrico Fermi”

2. Towards the discovery of B meson CPV in B decays Towards the asymmetric collider Reasons for success Future

3. The Nobel Prize in Physics 1976 Lederman’s sholder

5. Ellis Gaillard Nanopoulos Rudaz 1977 Bander Silverman Soni 1979 Cater & AIS, Bigi & AIS 1980 Discovery of Υ(4S) Phys. Rev. Lett. 45, 219–221 (1980) [Issue 4 – 28 July 1980 ]

6. t d b b W W t d

8. We thought that m t was about 20 GeV t d b b W W t d

9. ARGUS 87

10. B meson life time about 1ps This is very long Longevity leads to happiness e b c 1982 MAC-MARKII Discovery: Longevity of B

11. There is good news and bad news: ● Good news is that there is CP violation in heavy meson decays ● Bad news is that it is very small Phys.Rev.D12:2744-2750,1975 Arguments apply to any heavy quark

12. B is definitely different from K!

13. qeq ii i i   3x3 unitary matrix has 9 real parameters For 6 quarks, there are 5 phases we can adjust Three families needed B system b c u d K system

16. Can we find an observable related to Φ １ ?

17. B π + π － B

19. Can we find large CP asymmetry in major decay modes of B? b c W d u W s d u d B b c W d u W s d u d B KSKS KSKS These diagrams will not interfere

20. Carter AIS 1980 Final state is not CP eigenstate B B K S +X

21. Nothing was known about the KM matrix Today’s values Carter and AIS PR D23 (1980) We thought 20 GeV is almost ∞ 1982 MAC-MARKII Discovery: Longevity of B

22. With Ikaros

24. Big Asym Even Br small is better B ψK S Bigi AIS 1981

25.  K d B b c s d c s W

27. b c d ｘ t

28. the asymmetry vanishes for J=1 BB state if we don’t observe time S-Wave No photon has been detected! Out for CLEO Problem

29. Symmetric Collider 20μm separation This is impossible to measure

30. 9GeV+3GeV 200μm separation

34. SLAC machine physicists build machines for physics discovery. Go for conservative, well known technology. I got the impression that KEK machine physicists want to also play with new innovation.

35. 11mrad

40. Where do we go from here? asymmetries discovered July, 2000

43. ?? +52 T violation +51 +47 CPTV … +17 +20 +9 +7 1946 1980 discoveries CP violation

49. Jim Cronin

50. We don’t expect new physics effect to be sticking out at 10 % level. We don’t know if it will stick out at 1% level. But, we should go for unexpected discoveries! Not those classified as expected triumph of a peculiar theory

51. 1.Don’t forget, without flavor physics, we don’t have the standard model 2. B physics will be producing results 30 years from now. 3. Precision experiments can reveal new physics if it is out there around 1 TeV.