ppm by the end of the data collection.
A New BNL Facility:
The 1.5T Muon Storage Ring. Experiments after (g-2)
Contact person - Lee Roberts 516-344-2287 ROBERTS@buphyc.bu.edu
The (g-2) experiment will be taking data through 2000 or 2001.
The precision on the anomalous moment of the muon could reach
ppm by the end of the data collection.
After completion of data collection for (g-2), the world's most uniform spectrometer magnet will be available for other experiments. Improvements could be made to the beam coming into the storage ring. For example, with a lithium or a plasma lens one might be able to increase the flux into the storage ring by a factor of 50 to 100.
Those interested in pursuing ideas for using this excellent resource should join this working group. Several ideas, which have been put forward for additional experiements using this facility, are listed below. Others are welcome.
1) A dedicated experiment to measure the muon electric dipole moment.
Although a new limit on the muon EDM will be established by the (g-2)
experiment (the current value is
),
it only appears as a second order effect. A more direct approach can be
established by spin and momentum manipulation with a strong
horizontal electric field. This will eliminate the muon spin precession
due to the magnetic dipole moment while that due to an EDM is not
influenced substantially.
It is estimated that this direct method will improve the
limit by four orders of magnitude bringing it at the border of
interest of some SUSY models.
2) A new limit on the muon neutrino mass using the 2-body decay of the
pion. One could make
a direct measurement of the effect of neutrino mass
on the momentum of the daughter muon. The change in momentum between the
pion and muon is only a part in a million, so it will be
necessary to develop new methods of tracking since
conventional tracking methods introduce too much multiple scattering and do
not have the required resolution. Non-invasive techniques such as pickup
electrodes and/or electro-optic techniques are one possibility. By measuring
the time distribution of the incident pions, and the
stored daughter muons over many turns in the same apparatus,
one may be able to reach a sensitivity substantially better than
the current limit of 
> 0.27 MeV.
3) Add your own!
Interested parties should contact: Yannis Semertzidis, YANNIS@bnlarm.bnl.gov, Prisca Cushman, PRISCA@mnhep1.hep.umn.edu, or Lee Roberts, ROBERTS@buphyc.bu.edu