NOTE: sorry the original post got accidentally deleted ( the wonders of drupal), the old address was : "http://drupal.star.bnl.gov/STAR/blog-entry/melnimr/2008/oct/06/qa-run-8-production-dau-zvpd-ztpc-minuitvf "

Using the calibrated VPD (local file) for few runs in dAu (9025065 -9027087)  I was able to have some QA plots :

I limited the number of MuDst files to 100  "new StMuDstMaker(0,0,"",file,"MuDst",100) " since I am running it interactively and it runs out of memory and gets killed by the kernel.

<input URL="catalog:star.bnl.gov?filetype=daq_reco_Mudst,trgsetupname=production_dAu2008,production=P08ic,storage=nfs,runnumber[]9025065-9027087,filename~st_physics" nFiles="2000"/>

Macro located at :

~melnimr/vtx_dev/mudst2ntp_vpd.C

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Out of 17k events where a VPD and a TPC vertex exit  ,14k match within
20cm,

=====>  17k/14k = 84.4 %

P.S : the # of entries on the first histogram is for all events including ones without a vpd vertex (so 17k is a subset of that ).

  Fig. 1 :zVPD-zTPC (production/MinuitVF)

 Fig. 2 :zVPD-zTPC (<20cm) (production/MinuitVF)

Fig. 3 :   A correlaton of zVPD vs. zTPC  (production/MinuitVF)

NOTE: Jan Baleski noted that the horizontal correlation is due to pile up.

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Plots below are for MB(VPD-ZDCE):

Out of 3.8k  3.4k (<20cm) ===>85.9%