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Version: 1.1

FastJet

This software is mandatory to use all the functionalities of EPOS4.

The installation is straightforward and all the steps can be found in the FastJet official website and will be reported in the next lines. First download code and unpack it (you can either use "curl -O" or "wget")

curl -O http://fastjet.fr/repo/fastjet-3.4.0.tar.gz
tar zxvf fastjet-3.4.0.tar.gz
cd fastjet-3.4.0/

Proceed then to the installation of the software

./configure --prefix=$PWD/../fastjet-install
make
make check
make install
cd ..

To test if the installation was successful, download this example program, compile it and run it using the command

g++ FJexample.cc -o FJexample \
      `fastjet-install/bin/fastjet-config --cxxflags --libs --plugins`
./FJexample.cc

which should return an output consisting of the FastJet banner, and the following lines

Clustering with Longitudinally invariant anti-kt algorithm with R = 0.7 
and E scheme recombination
        pt y phi
jet 0: 103 0 0
    constituent 0's pt: 99.0001
    constituent 1's pt: 4.00125
jet 1: 99 0 3.14159
    constituent 0's pt: 99

The final step in order to run EPOS4 properly is to declare the variables FASTJETSYS and FASTSYS1, by simply executing

export FASTJETSYS=`fastjet-install/bin/fastjet-config --prefix`
export FASTSYS=$FASTJETSYS

Footnotes​

  1. They both need to be declared, otherwise there will be compilation errors with EPOS4 in BASIC mode. ↩