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Re: Vertex fitter(s) and B field setting in pandaroot release. [message #17863 is a reply to message #17862] Mon, 09 February 2015 10:43 Go to previous message
Elisabetta Prencipe (2) is currently offline  Elisabetta Prencipe (2)
Messages: 214
Registered: February 2013
first-grade participant
From: *ikp.kfa-juelich.de
Hello Stefano and Ralf,

thank you for your detailed information.

Of course, I think that the correct feature is to use the full B field map, and not to force it to 2 T (constant B field).
Actually this was not my idea: that line was in the tutorial analysis macro of some older trunk revisions, and I inherited in my analysis macro, when doing the upgrade of my trunk revision.
I discovered that in the most recent releases/trunk revisions, the line forcing the B field to be constant, is not any further (fortunately!). I used last summer for my simulations (rev 25375, if I am not mistaken), just because it was in the default setting. For some reasons, if now I comment it out, the vertex fitter(s) get crazy, in particular the 4C fitter. So, I assume that some more settings were changed, since last summer.

I'll try to run my analysis macro as in /macro/run/ana_complete.C (release oct14), and modify it according to my analysis, again. Then, if any trouble, I'll come back to this forum.

Thank you again, Elisabetta
 
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