This may come across twice...or not at all. I sent it yesterday but it never showed up on the server.... ---------- From: "Stephen J. Sanders" <ssanders@ku.edu> Date: Wed, 26 Jun 2002 13:41:45 -0500 To: <brahms-l@bnl.gov> Subject: MA Calibrations update Hi, Now that we have the beautiful reduced event files (thanks Claus, Ian, and whoever else helped to produce these files!!!), I've started to replay the runs to: a) get all of the MA pedestals correct and b) check that we don't have any serious problems with the array calibrations. To check the MA calibration, I'm calculating dN/dEta (SiMA) for the 0-5% and 30-40% centrality cuts, with the centrality calculated using the combined TMA and SiMA data as done for our multiplicity papers. The calculations are identical to what was done for the 200 GeV paper. Although I still have a number of runs to complete, I think a fairly reasonable picture is started to emerge and I wanted to relate this to the Collaboration as people get started on "final" passes. A figure of the dN/dEta results vs. run number is at http://kuphsx2.phsx.ukans.edu/~sanders/MACalib/dNdEta.jpg I've fixed the error bars at +/-4%. I have some other figures that might be of interest at http://kuphsx2.phsx.ukans.edu/~sanders/MACalib In particular, there is pretty clear evidence of a slope to the BB Vertex - TPM1 Tracking Vertex vs. Multiplicity plots for most runs. The same is true with the ZDC vertex. I've been doing these calculations since Monday and so any very recent changes in the DB may not be included in the present results. I hope to have new pedestals for all of the runs where we have reduced event files by this weekend. Unfortunately, these will be added to brat as ascii calibration files... Regards, Steve
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