I am trying to create an efficiency plot using ROOT 5.14 on an i686 linux box (FC7). I obtain errors greater than 1, which is conceptually wrong.
I have two histograms:
TH1F h_jetCPFnum = new TH1F("jetCPFnum","Title",nBins,MinBin,jMaxBin);
TH1F h_jetCPFden = new TH1F("jetCPFden","Title",nBins,MinBin,jMaxBin);
which are then filled using
if (cut) h_jetCPFnum->Fill(jetEt);
I then call Sumw2() on both, and divide
TH1F *eff = new TH1F(title,"title",nBins,MinBin,jMaxBin);
and I obtain errors that exceed 1, though the bin-contents themselves do not.
How can I fix this?