Minutes of the Neutrino Factory Study Group Meeting

November 23, 1999 - H. Schellman


General Announcements:
	
A 2 day meeting is planned for early February to finalize the content of
the document (due March 31).  Jan 31-Feb 1
Or Feb. 1-2 are likely dates.

Oscillations/detectors

Bob Bernstein showed results from the neutrino oscillations detector
studies. They are using a MINOS like detector, results are still limited
by MC statistics but the simulation included realistic detector
resolutions and offsets and backgrounds. He showed the effect on a
confidence interval in delta M2 theta space of a 1% flux determination
error.

Steve Geer showed optimization studies of detector distance and beam
energy for a mu-disappearance expt. Results are definitely different for
different detector locations for likely scenarios.  Some discussion of
the effects of backgrounds on these predictions as different
configurations have different signal to noise.

Debbie Harris reported further on the simulations studies for
sensitivity of a magnetized iron detector.  Campagneli is doing similar
work for an ICANOE style detector.  Early results show that charm
backgrounds can probably be reduced to 10-6 (for muon appearance?)  

Theory Scenarios

Theory Scenarios will report on sterile scenarios/4-flavor mixing next
meeting. A list of recent theory papers in this area has been posted to
the theory scenarios web site.

The Next 5-10 years

Hitoshi Murayama of LBL gave a detailed description of the results
expected for the next few years.

SuperK should get 3 times the statistics over the next 5 years.  Should
be able to tell numu-> nutau from numu->nusterile at the 3 sigma level
(2 sigma already?).  Even now pi0/e ration favors nutau.

MINOS/K2K should be able to confirm nmu disappearance. ICANOE should be
able to detect nutau appearance.

Several new experiments, MONOLITH in Gran Sasso and AQUARICH also become
important on the 10 year time scale.

On nmu->nue, BOOK, MINOS, K2K and OPERA/ICANOE should have something to
say.  Kamland may be able to rule out deltaM2 down to 10-5!

Non-oscillations

Kevin McFarland has been studying electroweak measurements in neutrino
electron scattering.  Need 10's of millions of events to be competitive,
this implies a detector mass of several tons.

Heidi Schellman reported that Ntuple version 0 with total cross section
for charge current DIS is available from the non-osc web page.  (Version
1 will have neutrino kinematics).

Basic summary, event rate is 7M/gr/cm^2/10^20 muon decays  at 50 GeV. 
Angular acceptance of detector is ~50%.  Total rate scales with energy,
angular acceptance goes from 25-80% as energy rises from 25-250 GeV.

The dominant cause of acceptance loss is wide angle decays from muons
which decay at the beginning of the straight section many 100 m from the
detector.  See note on the non-osc web page for details. 

Next Meeting

The next full meeting will be December 7, 1999 at 11:30 at the normal
time.