BrRdoModuleBB

From: Erik Jakobsen (jakobsen@hehi03.nbi.dk)
Date: Mon May 14 2001 - 07:49:06 EDT

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    Dear BRATs

I have a question concerning the BrRdoModuleBB (and more generally the
other detectors). I have made a GBRAHMS simulation with vertex at Z=0 and
it has been digitized. From my macro, which is intented for both
simulated data and experimental data, I am using the BrRdoModuleBB to get
the vertex from the beam-beam counters. When processing the simulated data
I get some strange values for the beam-beam vertex - e.g. Z=999 for 65% of
the events and the rest of the vertex values are far from Z=0 (10 to 50
cm off).

My guess is that the BrRdoModuleBB uses experimental calibration numbers
for the simulated data, and as far as I know these data should have its
own calibration numbers. 

Is there anyone who knows anything about this problem?   


Regards,
Erik & Djamel

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