An Object Oriented Jet Finder Library

The exploitation of hadronic final states played a key role in the successes of all recent HEP collider experiments, and the ability to use the hadronic final state will continue to be one of the decisive issues during the LHC era. Jet finders play a key role in this endeavour, and strong activities in this area have been progressing since many years. We use the advantages of the abstractions enabled by object technology, in order to extend the flexibility of the jet finding possibilities during analysis. The jet finder library described provides a comprehensive framework for jet-finding. It starts from any kind of consistent collection of reconstruction objects or particles, and results in a collection of user-defined jet class instances. We provide the jet-finding framework for CMS, and use this opportunity to exercise industrial software engineering processes to establish the proof of concept of physics object reconstruction for hadronic final states.