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

Two Generation Model 1.24 (P e  minimum)

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)

Super-Kamiokande 30 kton H 2 0 Cherenkov ” PMT’s

Super-K Atmospheric  Results

Neutrino Oscillation Interpretation   >  K2K, MINOS

Super-K Atmospheric  Results Oscillation to e disfavored

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

(2003)

Solar Neutrino Energy Spectrum

More missing neutrinos…

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

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

Neutrino Oscillations in the Sun

Solar Neutrino Results MSW only

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

(Assume CPT)

SNO Results: “Salt” phase

Global Analysis with SNO “Salt” phase

Open circles: combined best fit Closed circles: experimental data

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 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 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 eV 2

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