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Physics Colloquium-28 November 2001

•“The Neutrino Oscillation Industry” Maury Goodman, Argonne National Lab

Outline

Neutrino HistoryOscillationsWorld Tour of Experiments

Solar Atmospheric Long-Baseline Accelerator

Nu opportunities– Superbeams/ factories



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(,m2)

often x~ x(P12)



What SNO tells us

Super-K has measured ee, which is a mixture of NC&CC

• NC ieie , i=e,have same cross section

• CC eeee only

they measure a mix of e

SNO measures primarily ed ppe (CC breakup)

Together, one gets total, e

total is not low



interaction discovery

• DONUT - Fermilab beam dump experiment published 2000

• expected from Ds decay

• 203 events in photographic emulsion • See 4 events, expect 4.1 • Background from charm & hadrons

0.41



The truth about ’s

What we know:23~45o;

m223~.001-.01 eV2

12 & m223 SMA, LMA,

LOW or just-so sin213 < 0.05

What we want to knowm2

23 better

Which solar solution? See oscillations See’s ----------------------------------------

see 13 or limit to 10-3

CP violation Matter effects Sign of m2

23



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 source to the detector is much greater than the length of the decay pipe.

• Useful (Physics) - L >> E/m2



MINOS

A neutrino beam fromIllinois to Minnesota



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• Neutrino Oscillation Industry Web Page http://www.hep.anl.gov/ndk/hypertext/nuindustry.html



Conclusion

The world is one in which there has been much recent progress ( mass; mixing).

New insights are expected soon (KamLAND, Borexino, K2K, MINOS)

Another round of experiments at “superbeams” and factories will tell us more.

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