1. Recent Results from Super-Kamiokande and Sudbury Neutrino Observatory R. D. McKeown California Institute of Technology January 17, 2004 IHEP Beijing

2. Two Generation Model 1.24 (P e  minimum)

3. Length & Energy Scales E = 1 GeV,  m 2 =10 -3 eV 2, L = 1240 km E = 1 MeV,  m 2 =10 -3 eV 2, L = 1.2 km E = 1 MeV,  m 2 =10 -5 eV 2, L = 125 km Super-K Chooz, Palo Verde 1.24 (P e  minimm)

5. Super-Kamiokande 30 kton H 2 0 Cherenkov 11000 20” PMT’s

6. Super-K Atmospheric  Results

7. Neutrino Oscillation Interpretation   > 0.001  K2K, MINOS

8. Super-K Atmospheric  Results Oscillation to e disfavored

9.    neutrino ?    sterile  neutrino ?  solid sterile: dashed    s s s multi-ring  partially contained  through,upward 

10. (2003)

12. Solar Neutrino Energy Spectrum

13. More missing neutrinos…

14. Neutrino Oscillations? R orbit “Just So ??? “

15. Matter Enhanced Oscillation (MSW) Mikheyev, Smirnov, Wolfenstein   

16. Neutrino Oscillations in the Sun

17. Solar Neutrino Results MSW only

18. Solar Neutrino Results (Bahcall, Krastev and Smirnov, 2001)

23. (Assume CPT)

29. SNO Results: “Salt” phase

30. Global Analysis with SNO “Salt” phase

31. Open circles: combined best fit Closed circles: experimental data

32. Results from Solar and Atmospheric Neutrino Experiments Atmospheric data explained extremely well by oscillations  looks like primarily  to  conversion  mixing angle  23 is very large, possibly maximal   m 2 ~ 2 x 10 -3 eV 2 Solar e change primarily to other active ’s  if oscillations, mixing angle  12 is large but not maximal  if oscillations,  m 2 ~ 7 x 10 -5 eV 2  matter predicted to play a role in transformation ’s transform flavor  looks like primarily  to  conversion  mixing angle  23 is very large, possibly maximal   m 2 ~ 2 x 10 -3 eV 2

33. Maki – Nakagawa – Sakata Matrix Future Reactor Experiment! CP violation