muSC question, and mustop issues

[Tom Banks <tbanks@socrates.berkeley.edu>]

Dear Peter et al.,

first, a question about the Run8 muSC replacement which was performed
midway into the run: Does anyone remember the specs on the old and new
scintillators?  I found some documentation suggesting that the original
muSC was 500 microns thick, but I couldn't dig up anything in the ELOG
about its replacement.  Was the primary motivation for the muSC
replacement to further reduce the material budget in the beam and thus
improve the stopping fraction?  Or was it more of a question of improving
the muSC detection efficiency?

Secondly, the more I ponder the issue of muon scatters, the more concerned
I become... We discussed it here in Berkeley and decided that this issue
probably merits an entry in the systematics table, although it's difficult
to see how to go about quantifying the problem.  Furthermore, we don't see
any evidence of scatters in Bernhard's GEANT MC data.  If it's possible,
I'd like to have a telephone discussion on the subject sometime soon,
before people get wrapped up in Run9.

Tom