Gaussian convoluted with a Landau

Roofit and RooStats
1

Hi ROOTers,

I want to define Gaussian convoluted with a landau function in a ROOT macro. I dont want to use ROOfit. How can I do that?

2

${ROOTSYS}/tutorials/fit/langaus.C
http://root.cern.ch/root/html/tutorials/fit/langaus.C.html
[url]Plot changes when canvas is saved

3

What about the “parameters guessing”?

4

HI,

You have to set yourself the initial parameters of the function, since it is quite complicated and it is difficult to have a general algorithm to do it. We can guess these initial parameters only in fits where you are using a single pre-defined function like “gaus” or “landau” or “expo”.

Best Regards

Lorenzo