zdc vertex resolution in dAu run

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Hello.  Continuing slewing for global vertex counters, I finished ZDC 
slewing.

 From AuAu run, the typical resolution of ZDC vertex was about 3cm.  Due 
to the hardware change in ZDC (PMTs and TDC (camac --> FastBus) ), the 
old slewing does not work well (or at all???) for dAu run.  The vertex 
resolution from the current BRAT is about 6.5cm.  This is shown in 
http://pii3.brahms.bnl.gov/~hito/zdc/zdcvertex_resolution_noslew_noycut.gif

After slewing, it become about 3.4 cm. And, it is consistent with AuAu 
run. This is shown in 
http://pii3.brahms.bnl.gov/~hito/zdc/zdcvertex_resolution1.gif

For skeptical forks (very small statistics in the previous figure), the 
next figure is made without a cut in y for track vertex to increase 
statistics (by junk???).   Anyhow, you can see that the resolution is 
still about 3.7 cm.  The figure is located at 
http://pii3.brahms.bnl.gov/~hito/zdc/zdcvertex_resolution2_noycut.gif


(Next is Beam-beam counter)

Hiro

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