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RooFit normalization

Roofit and RooStats

moneta February 10, 2017, 6:18pm 2

Duplication of

RooFit normalization ROOT

I have an issue with the normalization of the fitted function with RooFit. I know that the PDF of the is automatically adjusted to the number of events. So far so good. The problem is when I fit twice** the same data with the same PDF, it looks like the normalization gets a factor 2 x the number of events (see attachment). Is there a way to get rid of that factor 2 ? Thanks, Salva ** Why do I want to fit twice? Well, in the first pass some parameters are fixed, then released for the second p…

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