Minutes of the neutrino factory study meeting 
December 7, 1999

H. Schellman


 

Theory Scenario IV - Sterile neutrinos - Albright

Assume LSND confirmed
	SNO sees suppression
	SuperK is seeing numu->nutau
	Solar is nnue -> nus
	

4x4 matrix , 6 angles, 3 phases 

Simplify by assuming 
delta m12 ~ delta m34 << delta M23 ~ 0.3 eV2 
(1,2) are sterile/electron

No CP violation here.

See this scenario at: 

http://www-theory.fnal.gov/people/parke/nutheory/


Neutrino Oscillation/detection Bernstein

Look for nue->nutau with signal being a muminus

Using a simple analysis and a MINOS like detector, the backgrounds are
of order 10-4, 10-3 with pi/K decay dominating at low Enu, neutral
current charm production
Dominating at high Enu.  Much comment that the cuts are somewhat
primitive and much improvement is likely.


ICANOE type detector - Mario Campanelli by phone from CERN.
Due to problems with Video, he could not show his slides.
They should should appear on the oscillations measurements group page
soon.  He did a 10Kton detector with 7000 km baseline.  Looks at the
energy distribution for

Electrons, mu+, mu-, nolepton events for both mu+ and mu-
Beams.  Gives 8 distributions.  Predict what they should be for various
parameters, see what you get out of a fit to the simulation.  Fits
converge and don't seem to be finding
Strange results.  Will try our scenarios.

More on beam characteristics/event rates - Heidi Schellman

http://www.nuhep.nwu.edu/~schellma/neutrino_factory/ now 
has a rate study which has tables of event rates for various target
sizes for total charged current and charm production cross sections. 
Use these to predict event rates for a set of experiments.

Rate on a 1m diameter 2 m liquid H2 target is 50M/year for 10^20 50 GeV
muminus decays, 5% of events are charm.

Rate on a W-Si sandwich 20cm by 20cm with 2 m of total material is 450M
events/year at 50 GeV, 25M charm, 2.5M
Tagged charm -> mu.  Kevin McFarland is doing more detailed studies.
This is about 2 orders of magnitude larger than existing tagged charm
samples.  Much better limit on D0/D0bar mixing.

We will have another meeting in 2 weeks time, Dec 21.
'Workshop' is tentatively scheduled for Feb 17-18.