Dear Experts, I am trying to fit my data using double sided crystal ball + Gaussian. The initial parameters looks fine however I got nan in error (see pdf attached). Also, I have tried to extract an uncertainties yields of both signal and background. I tried to use fitNormSum but I face issue with …

Nan in error fitting

hist, python

Wile_E_Coyote March 4, 2022, 3:38pm 8

Compute uncertainty of integral of a component of a TF1 ROOT

Hi, I am wondering whether there is functionality in standard ROOT (not RooFit) to compute the uncertainty of a component of a TF1. E.g. if fitting a function TF1 f1(“f1”,“gaus(0)+pol2(3)”) to a spectrum, I’d like to get the integral and its uncertainty only for the gaus(0) component. If there is no function available, how can I properly can do this myself? Another related question: If using a signal component, where the “amplitude” parameter already represents the integral (like it should b…

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