Thank you again. I am looking at a few tutorials like
- https://indico.nbi.ku.dk/event/631/contributions/3929/attachments/1322/1827/nbi_stats_lecture5.pdf
- https://www.nikhef.nl/~verkerke/statcourse_2014/
but I have not found a complete working example yet. I would really appreciate a minimum working example, which will be very helpful for other RooFit users.