[ROOT] TLorentzVector in a tree.

From: Perfetto Francesco (Francesco.Perfetto@na.infn.it)
Date: Wed Sep 04 2002 - 14:58:54 MEST 

 Hi Rene

I am trying to create a tree with a branch containing a TLorentzVector,
but it doesn't fill the variable (its components Px(),Py(),Pz(),E() in
the tree.

 What is correct for to use TTree::Branch ? (if possible a example).

{...
TFile   *file = new TFile("data.root","RECREATE");
TLorentzVector p4datrad;
TTree   *tdat = new TTree("tdat","Tree for resolution");
tdat->Branch("p4datrad","TLorentzVector",&p4datrad);
...
tdat->fill()
}
p.s. All others variables ( Double_t,Float_t...) are regularry filled


                                              Regards.

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