Recent Results from Super-Kamiokande and Sudbury Neutrino Observatory R. D. McKeown California...
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![Page 1: Recent Results from Super-Kamiokande and Sudbury Neutrino Observatory R. D. McKeown California Institute of Technology January 17, 2004 IHEP Beijing.](https://reader034.fdocuments.in/reader034/viewer/2022051215/56649e665503460f94b60c6b/html5/thumbnails/1.jpg)
Recent Results from Super-Kamiokande
andSudbury Neutrino
Observatory
R. D. McKeownCalifornia Institute of Technology
January 17, 2004
IHEP Beijing
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Two Generation Model
1.24
(Pe minimum)
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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)
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Super-Kamiokande
30 kton H20 Cherenkov 11000 20” PMT’s
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Super-K Atmospheric Results
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Super-K Atmospheric ResultsNeutrino Oscillation Interpretation
> 0.001
K2K, MINOS
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Super-K Atmospheric Results
Oscillation to e disfavored
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neutrino ? sterileneutrino ?
solid sterile: dashed
s
s
s
multi-ring
partially contained
through,upward
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(2003)
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(2003)
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Solar Neutrino Energy Spectrum
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More missing neutrinos…
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Neutrino Oscillations?
Rorbit
“Just So ??? “
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Matter Enhanced Oscillation (MSW)Mikheyev, Smirnov, Wolfenstein
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Neutrino Oscillations in the Sun
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Solar Neutrino ResultsMSW only
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Solar Neutrino Results
(Bahcall, Krastev and Smirnov, 2001)
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(Assume CPT)
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SNO Results: “Salt” phase
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Global Analysis with SNO “Salt” phase
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Open circles: combined best fitClosed circles: experimental data
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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
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Maki – Nakagawa – Sakata Matrix
Future ReactorExperiment!
CP violation