1) Heidi presented her letter for the underground committee. There was some discussion, mainly on how to fine tune the wording on location. We want to indicate some preference for a 3000 km baseline, without turning down detectors at other baselines. Heidi has sent around a revision, send her e-mail today if you want to sign it.   The current version is  here.

2) Andreas Romanino presented some results on phenomenology of sterile neutrinos. nu_tau -> nu_s and nu_e -> nu_s are disfavored at 99% and 95% CL, if there is only one nu_s. However, if you allow 3 flavors of nu_s, you can reproduce every wiggle of the superK solar neutrino spectrum, so it works very well. Eagerly await SNO results on the energy spectrum of solar neutrinos for a test of this model!  For terrestrial baselines (small fraction of a solar oscillation), the assumption of only one nu_s is still a good approximation. "Leading" oscillations are driven by dm^2_LSND. "next-to-leading" oscillations include the atmospheric dm^2, but still approximate the solar dm^2 as zero. The favored mass spectrum has pairs of closely spaced neutrinos, with the two pairs separated by dm^2_LSND. Boone is being built to search for the leading nu_mu -> nu_e oscillation. If it sees a signal, there could be CP violation in the "next-to-leading" oscillations, with the asymmetry becoming as large as ~50% at a baseline of 30 to 60 X Boone. With a new Booster, and a 100 Kton class detector, this may be observable. We would also expect nu_mu -> nu_tau leading oscillations. The probability may be much smaller than for nu_mu -> nu_e, but it should be measurable and provides useful info on the mixing parameters. CP violation in nu_mu -> nu_tau next-to-leading oscillations may also be observable with an upgrade NuMi beam. The sensitivity to the CP asymmetry is roughly independant of the leading probability.  One paper with the expressions is http://arXiv.org/abs/hep-ph/9903308 .  Also, I have copies of the transparencies.

3) Ray Stefanski presented results of a study of the capabilities of a Boone detector at a 200 km baseline with an upgraded beam using the new booster.   Such an upgraded beam might be built parallel to the existing one.  This might be an inexpensive experiment to build in time for a new Booster.  Ray has written up the details  here.

Fritz DeJongh