24.2. Fitting examples

Fits used in Belle II analyses can be simple or challenging. The examples listed below cover different levels of complexity and represent a good starting point for anybody interested to learn the basics of fitting:

• 24.2.1. Simple 1D fit
• 24.2.2. Efficiency fit
• 24.2.3. Lifetime 2D fit
• 24.2.4. Dalitz fit

For each example, fitting code has been developed within at least one of the following frameworks:

• RooFit - the recommended framework included in ROOT

• zfit - a python-based fitter

• MINUIT - the basic tool upon which RooFit and zfit rely, can be useful if you want to have better control over the details of the fit

• bat - the Bayesian Analysis Toolkit

• Hydra - a framework for multithreaded data analysis