I’ve several questions about the way a fit is done using RooFit with python …
I’ve joined a example of macro and a root file that contains Three histos : data, signal and background
With both signal and background, i’m creating a RooHistPdf and then i’m combinning them in an RooAddPdf that should fit my data histogram. i’ve associated to them a RooRealVar that is supposed to be the fraction of signal (fsig) and background (fbkg) in data so I’ve set these variable to be bound in [0,1] (is it correct ?)
My first question is do i have to normalized to one the data histogram ? (fisg and fbkg are always equal to one-the upper limit- if i’m not doing it). If i’m doing it, it looks good graphically but the fraction are really small, their sum is not equal to one and i can’t understand how am i supposed to interpret the errors bars.
Finally If i’m drawing anything with RooFits methods, it makes a segfault when i leave python interpreter and i don’t understand why.
I’m using ROOT 5.26.00