Speaker
Wouter Verkerke
(NIKHEF (NL))
Description
RooFit is a library of C++ classes that facilitate data modeling in the ROOT
environment. Mathematical concepts such as variables, (probability density)
functions and integrals are represented as C++ objects. The package provides a
flexible framework for building complex fit models through classes that mimic
math operators. For all constructed models RooFit provides a concise yet
powerful interface for fitting, plotting and toy Monte Carlo generation as well
as sophisticated tools to manage large scale projects. RooFit has been used in
countless published B-factory results and more recently also at the LHC. We will
review recent developments such as the ability to persist models in ROOT files
in container classes, which provides the basis for several new concepts and
techniques. This enables the concept of digital publishing of analytical
likelihood functions with an arbitrary number of parameters, which in turn is
the basis of the RooStats statistical tools that combine Higgs analysis channels
of ATLAS and CMS. Combined models can be technically trivially constructed
exploiting the editing and introspection methods provided by RooFit modeling
classes. Persistability also enable streaming of tasks to other computers which
facilitates parallelized calculation of computing intensive problems.
Author
Wouter Verkerke
(NIKHEF (NL))
