How to propagate the parameters after integration of function?

Dear all,

I’m trying to implement an integrated function for fitting.
The function is one dimensional with the integration over one parameter

Using this URL as a reference, https://root.cern.ch/doc/master/exampleFunctor_8C.html and
https://root-forum.cern.ch/t/integral-function-over-parameter/26707

I tried to fit using the integrated function, but it seems that the parameters are not propagated to the integrated function. (Integrated function does not have parameter)
What should I do?

Thanks,

@moneta can you help here please?

Thank you in advance,
Oksana.

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