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{
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TChain ch_ttbar("ttljets");
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ch_ttbar . Add("TTJets-madgraph_Fall08_IDEAL_V9_v2_14may2009.root");
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// selection
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#include "cuts.C"
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the_cut = "";
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// when copying, include all branches
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ch_ttbar . SetBranchStatus("*",0);
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/*
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ch_ttbar . SetBranchStatus("lepton_energy",0);
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ch_ttbar . SetBranchStatus("lepton_eta",0);
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ch_ttbar . SetBranchStatus("lepton_phi",0);
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ch_ttbar . SetBranchStatus("lepton_pt",0);
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*/
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ch_ttbar . SetBranchStatus("*_energy",1);
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ch_ttbar . SetBranchStatus("*_eta",1);
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ch_ttbar . SetBranchStatus("*_phi",1);
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ch_ttbar . SetBranchStatus("*_pt",1);
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// output file
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TFile * out_file = new TFile("./sample.root", "RECREATE");
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// create new TTrees from the input
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TTree * t_sig = ch_ttbar . CopyTree(the_cut);
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TTree * _data = t_sig->CopyTree("","",10000,0);
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// define new TTree names
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_data.SetName("data");
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out_file->cd();
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_data->Write();
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out_file->Write();
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delete out_file;
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}
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