CEDAR: Tools for Event Generator Tuning

I describe the work of the CEDAR collaboration in developing tools for tuning and validating Monte Carlo event generator programs. The core CEDAR task is to interface the Durham Hep-Data database of experimental measurements to event generator validation tools such as the UCL JetWeb system—this has necessitated the migration of HepData to a new relational database system and a Java-based interaction model. The “number crunching” part of JetWeb is also being upgraded, from the FORTRAN HZTool library to the new C++ Rivet system and a generator interfacing layer named RivetGun. Finally, I describe how Rivet is already being used as a central part of a new generator tuning system, and summarise two other CEDAR activities, HepMLand HepForge