[Brahms-dev-l] dAu centrality

Hi,
Over the weekend and this morning I committed a number of changes to 
the centrality
calibrations for the dAu runs.   I checked the changes for
runs in brahms/data12/reduced03.    A summary plot is at

http://kunuc6.phsx.ukans.edu/~sanders/CentCheck.gif

with the corresponding root macro

http://kunuc6.phsx.ukans.edu/~sanders/CentCheck.C

if you want to check specific run numbers in more detail.

The first panel, labeled Ratio, gives the 60-80%/0-20% yield
ratio.

The panel labeled Scaled SiMult-TileMult is pretty much as advertised,
although the difference is divided by (average mult+10).   The two 
panels
labeled Tile and Si single mip peak are from Gaussian+exponential
background fits.  The Gaussian centroids and width are shown.  The other
two panels just show the pedestal location and widths.

I believe the calibrations are now reasonable.

In general, the SiMA was not happy during much of the dAu run.  Enough
of the array was misbehaving for runs 8277-8366 and 8452-8505 that I've
had to switch to a TMA only calibration for these ranges.  Different
calibrations were needed for the two ranges since
one of the tiles (tile5_3) was also not
functioning for the earlier run set.   For other runs I've had to 
switch off in the
analysis particular SiMA strips and wafers, but I think enough of the 
array was
present to leave it in the centrality calibration.

The "Gold" run, where the analysis for the mult paper was done, is 8404.

I have redone the geant simulation for the runs where tile5_3 was off to
get the correct efficiency correction for these runs.

Regards,
Steve


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