TMinuit MIGRAD - Likelihood minimization

Hello :slight_smile:
I am trying to fit energy of the particle by means of LogLikelihood minimization. I use TMinuit - MIGRAD for this purpose. However, if I run my code several times I obtain totally different energies - seems that likelihood function converges in wide range of energies. Do you have some suggestions, please? What can cause such instability in minimization?

Thank you for reply in advance.

It is possible that some of the parameters are very correlated so the solution is not anymore a single point.
If you start with different initial points and you get different solutions, this can be caused also by the presence of several local minima.
I would suggest to check for the returned correlation and the status of the computed Hessian.


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Thanks a lot for your suggestion.

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