Dear all, I'm developing a tracking procedure which should manage to recognize primary and prompt particle tracks. In order to calculate the efficiency of my implementation, I would find a way to include (as findable tracks) all primary tracks together with the secondaries which were produced quite near to the primary vertex. When I read the TParticle class, I encountered a fVx,y,z, members which should help for the production vertex locating, but I found that this vertex can be nealry everywhere! The strange thing is that, studying the tracks recognized with the Kalman algorithm for ALICE ITS, most of these recognized tracks seemed to have their vertex located in all the space up to the RICH (!). How can I get the information I need, then? Regards Alberto
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