Hi Root, I think I am beginning to understand Rene's comment that it would be better if I created a simple event class to handle my Tree filling tasks [see the thread I started about two weeks ago]. All the Event class examples I have seen so far are filling TClonesArrays of Tracks. The question: something about the name Clone suggests to me that my objects will lose their identity if I make them part of a TClonesArray; that is I would not be able to associate a particular member name with that object later on. I want to be able to say something like T->Draw("ppsi.Mag()") So it would appear that I should not use a TClonesArray since I want to know easily which particle is which in later analysis (and since there are not many particles produced). Also, suppose I have some TLorentzVector objects which for some events are present, but others not. How do I prevent old values from showing up in the tree? Can I just set the object equal to zero (as some of the examples seem to do with unitialized objects)? Thanks for any help. Jeff
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