Outline

1
Outline

• Neutrino History
• n Oscillations
• World Tour of n Experiments
• Solar n
• Atmospheric n
• Long-Baseline Accelerator n
• Nu opportunities
• Superbeams/ n factories

2
Testing Oscillations

• In the design of any neutrino oscillation
  experiment, you want to measure something (x)
  which will be different if oscillations exist
• e.g. Nevent , RNC/CC, Nkink
• In general, x x(q,Dm2)
• often x x(Pn1?n2)

3
What SNO tells us

• Super-K has measured ne?ne, which is a mixture of
  NCCC
• NC nie?nie , ie,m,t have same cross section
• CC nee?nee only
• ? they measure a mix of ne nmnt
• SNO measures primarily ned ?ppe (CC breakup)
• Together, one gets ftotal, fe
• ftotal is not low

4
nt interaction discovery

• DONUT - Fermilab beam dump experiment published
  2000
• nt expected from Ds ?tnt decay
• 203 n events in photographic emulsion
• See 4 events, expect 4.1 ? 1.4
• Background from charm hadrons
• 
  0.41 ? 0.15

5
The truth about ns

• What we want to know
• Dm223 better
• Which solar solution?
• See oscillations
• See ts
• ----------------------------------------
• see q13 or limit to 10-3
• CP violation
• Matter effects
• Sign of Dm223

• What we know
• q2345o
• Dm223.001-.01 eV2
• q12 Dm223 SMA, LMA, LOW or just-so
• sin2q13 lt 0.05

6
How Long is Long?

• Definitions of Long-Baseline
• (my use is for accelerator based experiments)
• Webster - (long - measuring much, or more than
  usual, from end-to-end in space or time)
• Practical - Off site
• Useful (Beam) - The distance from the n source to
  the detector is much greater than the length of
  the decay pipe.
• Useful (Physics) - L gtgt En/Dm2

7
MINOS
A neutrino beam from Illinois to Minnesota
8
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9
Conclusion

• The n world is one in which there has been much
  recent progress (n mass mixing).
• New insights are expected soon (KamLAND,
  Borexino, K2K, MINOS)
• Another round of experiments at superbeams
  and n factories will tell us more.