Hi Rooters, I would like to be sure of the behavior of a TEventList object when applied to a TChain. For instance if I have: TChain chain("tree"); chain.Add("monbeau.root"); chain.Add("sapinroi.root"); chain.Add("desforets.root"); TCut neutron_cut = "(missppp.M2()>0.713)&&(missppp.M2()<0.974)"; tree->Draw(">> neutron_select", neutron_cut); TEventList* neutron_select = (TEventList*) gDirectory->Get("neutron_select"); tree->SetEventList(neutron_select); tree->Draw("pp.M2()"); Does this work? I read somewhere in the ROOT talks that with tree friends this can be a trouble, but what about TChain? I am using ROOT 3.02 Thanks Matthieu Guillo University of South Carolina Thomas Jefferson National Laboratory Office 71 trailer 16 Phone: 757-269-5551
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