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 , R=NC/CC, Nkink
In general, x = x(q,Dm2)
often x~ x(Pn1n2)

3. What SNO tells us ftotal is not low
Super-K has measured nene, which is a mixture of NC&CC
NC nienie , i=e,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  1.4
Background from charm & hadrons
0.41  0.15

5. The truth about n’s What we want to know What we know: Dm223 better
Which solar solution?
See oscillations
See t’s
see q13 or limit to 10-3
CP violation
Matter effects
Sign of Dm223
What we know:
q23~45o;
Dm223~ eV2
q12 & Dm223 SMA, LMA, LOW or just-so
sin2q13 < 0.05

6. Definitions of “Long-Baseline”
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 >> En/Dm2

7. MINOS
A neutrino beam from
Illinois to Minnesota

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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.