RE: [Brahms-dev-l] calibration

Flemming,
  The ZDC slewing corrections was the first thing I did for Brahms.  Once I determined the proper corrections I had to determine a vertex offset for the ZDCs.  On 3/14/04, I determined the slew parameters and vertex offsets for a handful of runs from 9089 to 10426.  The vertex offset was determined by comparing the ZDC vertex to the spectrometer vertex.  The spec vertex was generated by the z intersection of all the spectrometer tracks to a line centered in the beam pipe.  This is the method that was previously used.  I believe that the ZDC vertex will be good to within its resolution for the AuAu 200 GeV data.
Erik


-----Original Message-----
From:	brahms-dev-l-bounces@lists.bnl.gov on behalf of flemming videbaek
Sent:	Fri 8/13/2004 2:56 PM
To:	devlist
Cc:	
Subject:	[Brahms-dev-l] calibration
There is uncertainty to what calibrations (apart from those needed for the local tracking tpc's and DC) are in a good
shape for the 200 GeV Au data set. Since several people are eager to proceed with analysi at the gtr+dst level 
in particular the most important ones are those for BB, ZDC and possibly the basic TOF cal namely pedestal, gains
to be able to create the matching objects (tof cals are done at the subsequent level). 

- bb looks at level zero ok,for gains but cannot be good
  e.g. for 9841 the vtx is offset by -23 cm and has signs of multiple peaks..

- zdc vtx looks reasonable centered and good sigma for vertex..

- Those of you who know specifics please respond, so the status of this can be assessed.Until this
   is clarified it does not make much sense to forge ahead with grt, and dst

regards
    Flemming


----------------------------------------------------------------
Flemming Videbaek
Physics Department
Brookhaven National Laboratory

e-mail: videbaek@bnl.gov
phone: 631-344-4106



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