Good evening everyone, I performed the fit of a histogram with both ROOT and RooFit. The function I am analyzing is the Voigt (i.e. the convolution of Gaussian and Breit-Wigner). I noticed that with the two methods the parameters I declare are different: With ROOT, I have the normalization, th…

Hi Thanks for the macros. I could reproduce the difference, but these are 2 different functions, one a numerical convolution and the other a FFT. Are you sure the function parameters are the same also ? It is not a different result because using different tools, but using different methods Lorenz…

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Different parameter values for fit with ROOT and Roofit

Roofit and RooStats

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