Recent Results from Super-Kamiokande

andSudbury Neutrino

Observatory

R. D. McKeownCalifornia Institute of Technology

January 17, 2004

IHEP Beijing

Two Generation Model

1.24

(Pe minimum)

Length & Energy Scales

E= 1 GeV, m2=10-3 eV2 , L = 1240 km

E= 1 MeV, m2=10-3 eV2 , L = 1.2 km

E= 1 MeV, m2=10-5 eV2 , L = 125 km

Super-K

Chooz,Palo Verde

1.24

(Pe minimm)

Super-Kamiokande

30 kton H20 Cherenkov 11000 20” PMT’s

Super-K Atmospheric Results

Super-K Atmospheric ResultsNeutrino Oscillation Interpretation

> 0.001

K2K, MINOS

Super-K Atmospheric Results

Oscillation to e disfavored

neutrino ? sterileneutrino ?

solid sterile: dashed

s

s

s

multi-ring

partially contained

through,upward

(2003)

(2003)

Solar Neutrino Energy Spectrum

More missing neutrinos…

Neutrino Oscillations?

Rorbit

“Just So ??? “

Matter Enhanced Oscillation (MSW)Mikheyev, Smirnov, Wolfenstein

Neutrino Oscillations in the Sun

Solar Neutrino ResultsMSW 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 fitClosed 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 m2 ~ 2 x 10-3 eV2

• Solar e change primarily to other active ’s

if oscillations, mixing angle 12 is large but not maximal if oscillations, m2 ~ 7 x 10-5 eV2

matter predicted to play a role in transformation

• ’s transform flavor

looks like primarily to conversion mixing angle 23 is very large, possibly maximal m2 ~ 2 x 10-3 eV2

Maki – Nakagawa – Sakata Matrix

Future ReactorExperiment!

CP violation