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FastJet
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The FastJet package, written by Matteo Cacciari and Gavin Salam and
Gregory Soyez, provides a fast implementation of several
longitudinally invariant sequential recombination jet algorithms, in
particular the longitudinally invariant kt jet algorithm, the
inclusive longitudinally invariant version of the Cambridge/Aachen
jet-algorithm, and the inclusive anti-kt algorithm (M. Cacciari,
G.P. Salam and G. Soyez, LPTHE-07-03 (in preparation)).
The implementation is based on the geometrical methods described in
M. Cacciari and G.P. Salam, Phys. Lett. B 641 (2006) 57 [hep-ph/0512210].
Means are also provided for accessing external jet-algorithm software
via a common (plugin) interface and the package notably includes
SISCone, an infrared safe seedless stable-cone type algorithm introduced
in G.P. Salam and G. Soyez, JHEP 0705 (2007) 086 [arXiv:0704.0292].
Various tools are also provided related to jet areas and
subtraction. They can be used with any infrared safe jet algorithm,
both native and plugin. The ideas behind them are described in
M. Cacciari, G.P. Salam, arXiv:0707.1378 (PLB to appear), and
M. Cacciari, G.P. Salam and G. Soyez, LPTHE-07-02 (in preparation).
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Installation
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Installation instructions are provided in the INSTALL file.
Note that to benefit from NlnN implementation (relevant for a number
of particles N greater than 15000 roughly) of the kt (and anti-kt) jet
algorithm , you will need to download CGAL from http://www.cgal.org/
and compile it before compiling the FastJet library. The NlnN
implementation of the Cambridge/Aachen jet-algorithm is independent of
CGAL.
Automatic documentation can be generated by running the doxygen command
(if not installed on your system see www.doxygen.org) in the main
directory. It will create the html/ and latex/ directories containing
detailed technical documentation.
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Directory structure
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doc/ Documentation
src/ the .cc files for the FastJet library
include/ the include (.hh) files for the FastJet library
lib/ destination for the libfastjet.a library
example/ contains some example programs
example/data/ contains some files with data for events
example/root/ an example root script to show jets as calorimeter towers
plugins/ the various plugin jet algorithms
fortran_wrapper/ an illustration of how to use fastjet from fortran
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Known bugs
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See the BUGS file as well as the web page,
http://www.lpthe.jussieu.fr/~salam/fastjet/, for information
discovered subsequent to the release.

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