Hej dev-iants, I would like to determine the collision vertex for each event that I analyze. I can get a vertex from the ZDC. Averaged over many collisions, this tells me that the average VTX Z is approx -40 cm. I can do the same for BB, and find that the average VTX Z is approx 10 cm. This is, by the way, for run 4265. Now, I guess that both of the above cannot be right. In fact, the two are not only different, they are not very well correlated at all. So...I'd like to try to extract a TPM1 vertex, which should be the easiest to get "right". Is there a module which takes local TPM1 tracks and returns Z? Is there another way one can do this? Say, any module which takes TPM1 data and returns Z? And can this be used in the context of Christian's bratmain. Rumors from the north (of Copenhagen!) indicate something in the works, but I could not find anything in the html documentation on pii3. -Ian
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