Djamel, What was your inout distribution. My guess is the tracks are not uniformly distributed? Try to switch the magnetic field for D2 and look at the distribution. Why do I say this - Brag does not know anything about pads - only the volume below a given padroa. Please send these kind of messages to either brahms-dev-l or brahms-soft-l. Flemming ------------------------------------------------------ Flemming Videbaek Physics Department Brookhaven National Laboratory tlf: 631-344-4106 fax 631-344-1334 e-mail: videbaek@bnl.gov ----- Original Message ----- From: "Djamel Ouerdane" <ouerdane@nbi.dk> To: <brahms-l@bnl.gov> Sent: Tuesday, April 16, 2002 1:32 PM Subject: brag and T2 > Hi all, > > I've made a quick simulation (single pion event) and used > BrGeantToTpcTrackCandidate for T1 and T2. I checked the histograms and got > a doubtful plot with T2 (T1 looks ok I think) : > > You can check the plot here: > > http://www.nbi.dk/~ouerdane/T2PadRow.gif > > The simulation was using the TPC calibration parameters from run 5609. I > could check the same histogram with real data but before the tracking was > done. I could not do it after since the pad information is not propagated > by default. Anyway, the real data didn't show this gap on the left side. > > Any idea why ? I suspect it comes from brag but TPC experts should > comment. > > Djam > > > -- > Djamel Ouerdane ------------------------------------------o > | Niels Bohr Institute | Home: | > | Blegdamsvej 17, DK-2100 Ø | Jagtvej 141 2D, | > | Fax: +45 35 32 50 16 | DK-2200 Copenhagen N | > | Tel: +45 35 32 52 69 | +45 35 86 19 74 | > | http://www.nbi.dk/~ouerdane | > | ouerdane@nbi.dk | > o---------------------------------------------------------o >
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