This is a follow-up on the report from
July 17. After a lot of long discussions and thought, Paul
and I updated the report, and now believe that it is correct for linearly
polarized photons. This also means that we can quite trivially write down
the fit amplitudes for the double blind weight that Adam gave us, and
can fit a couple of mass bins to see what comes out. We plan to start on this
on Monday the 24'th when Paul is back from his long weekend, (he really earned
a break).
Howver, we are not out of the woods yet. We are still not certain how to
write down the weights for unpolarized events. We have had an number of
discussions on this, but we are not certain where we are yet. The main
thing is that we want to be able to relate the polarized and unpolarized
production strengths, but one nominally wants to write things down in
a helicity basis for unpolarized, and a reflectivity basis for the polarized
case. More to come as we figure it out.
Finally, we are still waiting for the error calculator, so it is still
going to be difficult to interpret the results that we will get early next
week. We also have a problem in the fitting code that does not allow us
to lock one phase to zero in each incoherent amplitude. This leads
to lare correlations between results that would not be there if we could
get the fitter to behave a bit better. This problem is also going to
obscure the results that we will get next week.