A software package for jet finding in pp and e+e- collisions. It includes fast native implementations of many sequential recombination clustering algorithms, plugins for access to a range of cone jet finders and tools for advanced jet manipulation.
Feb. 7, 2013: the page for contributed add-ons to FastJet is now live at
was released on June 26, 2012 (
for a quick tour of the new features of FastJet 3.
The major new features of FastJet 3.0 relative to the 2.4.x series are:
Filtering, trimming, pruning and a few boosted object taggers as part of a new native "Transformers" framework for post-clustering manipulation of jets.
New background estimation and subtraction interface, with JetMedianBackgroundEstimator, GridMedianBackgroundEstimator and Subtractor.
Enhancement of the PseudoJet class so that jets are now aware of their internal structure (e.g. one can use jet.constituents()).
Selectors, which allow easy communication of cuts across different functions.
The option to associate arbitrary user information with a PseudoJet.
Many smaller changes, including aids for easier memory management, two new plugins, enhanced fortran wrappers and elimination of the R<π/2 restriction on native jet algorithms.
Gavin P. Salam