[G8b_run] Meeting next week

[Brian Vernarsky]

Hi all,

In advance of tomorrow's meeting I just wanted to send around two plots.
The first shows the huge increase in statistics that I have been able to
get for my analysis.  Note that I am looking for the omega and thus have a
three particle final state.  The value that I call my signal is in fact the
sum of the Q-values that we use in our partial wave fits to weight the data
vs background.  So these are all events that will actually be used in the
analysis.  I've combined all of the datasets together for simplicity and
only included the 1.3, 1.5 and the manual parts of the 1.7 datasets, both
PARA and PERP, as these are all that have been completely cooked.  Most
bins, above W=1800 MeV have 3x the amount of signal and bins below W=1800
have up to 9x the signal!  The overall gain is appx 3.5x the old signal.
Below the main plot I've plotted the actual ratio in each bin for
convenience.

The other plot shows the rho0_00 spin density matrix element that first set
me looking for problems with the dataset.  In both plots I have used the
following color code: black = old data (prior to the recook), red = new
data (recooked), blue = g11a.  Only the rho0_00 plot has g11 info on it.
Again, for convenience I'm showing only the results I get from combining
all of the datasets, compared to what I had before when I combined all of
the datasets.  They certainly can be separated, but that would lead to
entirely too many plots!!

Recall that the issue I was seeing with my results was that this rho0_00
element was consistently lower than g11 at middle values of
cos(theta^omega_CM) across all sqrt(s) bins.  The newly cooked data, with
newly cooked Monte Carlo, brings those values up in most places, though
there may still be a little bit more to go in certain bins (see for
instance the cos(theta) = 0.05 or 0.15 bins at higher sqrt(s)).  I'm
hopeful the remaining issues that Franz is working on fixing will resolve
these discrepancies.

Here are the files:

http://www.andrew.cmu.edu/user/bvernars/ratio_of_signal_g8b.pdf
http://www.andrew.cmu.edu/user/bvernars/rho_0_00_g8b_old_black_new_red_g11_blue.pdf

Cheers,

Brian
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