Minerna nm, m2 Magnetic Moment Limit

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May 14, 2004
Minerna - nm, m(2) Magnetic Moment Limit
Physics
For massless neutrinos mn disappears, simple
extension of Standard Model
? SM prediction Very small!
An unexpected large magnetic moment - New Physics
and model dependent extraction of absolute
neutrino mass. Present limits lt 6.8 ?10-10 mB
LSND 2001 (Miniboone claims a projected
factor of 2 improvement) from nm- e scattering.

V. Paolone/UPitt
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May 14, 2004
Experimental Signature EM coupling to atomic
electrons -
Kinematic Constraint Very forward scattered
electron !
Standard weak process has very different
dependence
Game is to get as small as possible.
V. Paolone/UPitt
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May 14, 2004
Back of envelope calculation for a fine grained
detector - Minerna ?Assuming 3 ton target
region, 5?1020 POT (? 2?1017 ns/m2), and
100 MeV
Limit 3-5 ? 10-10 mB
Maybe worth pursuing for more realistic study. ?
Specifically Backgrounds!
In that light, a mn interaction generator has
been written (Barun Dhar, Pittsburgh) and
integrated into the Minerna MC by Steve Boyd.
A good exercise for a graduate student
V. Paolone/UPitt
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May 14, 2004
Some MC examples of mn interactions
? 100 MeV Scattered Electron
10 MeV Scattered Electron?
V. Paolone/UPitt
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May 14, 2004
Conclusions

• ? Further investigation worth pursuing.
• Tools for detailed study are now in place
• ?Backgrounds - Single po production,
• Standard Weak
  Scattering
• ?Threshold - How low can we set
  ?
• ? How large can we make active area?
• ? Hope to have better results in few months

V. Paolone/UPitt
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