On Wed, 24 Oct 2001, Stephen J. Sanders wrote: > Hi Djamel, > Nice figures. A question, however: If I download the latest brag and > use it with the > run 5326 calibration, does your last figure indicate that I will have to > apply an > additional offset of 18.07 cm to get the correct BB vertex? > > ...steve > Hi Steve, yes, you're absolutely right. In fact, there will be soon a vertex calibration package inserting offsets in the database for BB ZDC and so on. I realized (and Flemming wonders about it) that this offset fluctuates. It needs some calibration every week at least. It's on its way... Note that you have to be aware that this offset only applies for the small tubes. But the efficiency in the small tube vertex finding is very good (around 0.97 in the sample I've scanned BEFORE requiring MRS tracks). Ciao Djam -- Djamel Ouerdane ------------------------------------------o | Niels Bohr Intstitute | 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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