Hi Steve I've looked at the centrality for the high field runs (5901-5983) and I found this: http://www.nbi.dk/~ekman/centTest.gif http://www.nbi.dk/~ekman/centTestZoom.gif which worries me a bit. I should say that to produce these plots I've made a vertex cut (+- 15cm) and requiring good zdc-bb correlation. It looks like the calibrations are not optimal. However, I don't think that there's much to do about it now. The reduced files are produced and I don't think we have time to do more calibrations and reductions before QM. And I guess that 5% central is more or less the most central events. Cheers, Claus +-------------------------------------------------------------+ | Claus Jørgensen | | Cand. Scient. Phone : (+45) 33 32 49 49 | | Cell : (+45) 27 28 49 49 | | Niels Bohr Institute, Ta-2, Office : (+45) 35 32 53 07 | | Blegdamsvej 17, DK-2100, E-mail : ekman@nbi.dk | | University of Copenhagen Home : www.nbi.dk/~ekman/ | +-------------------------------------------------------------+ On Thu, 27 Jun 2002, Stephen J. Sanders wrote: > 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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