many_algs_example.cc

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// $Id: many_algs_example.cc 435 2007-01-23 15:18:35Z salam $
//
// Copyright (c) 2005-2006, Matteo Cacciari and Gavin Salam
//
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// This file is part of FastJet.
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//----------------------------------------------------------------------
// example program to illustrate the use of multiple jet-definitions,
// some of which are plugin based.
//
// Compile it with: make many_algs_example
// run it with    : ./many_algs_example < data/single-event.dat
//----------------------------------------------------------------------

#include "run_jet_finder.hh"
#include "CDFMidPointPlugin.hh"
#include "SISConePlugin.hh"
#include "PxConePlugin.hh"
#include<vector>
#include<iostream>
#include "fastjet/PseudoJet.hh"

using namespace std;

int main(int argc, char** argv) {

  // read input particles
  vector<fastjet::PseudoJet> input_particles;
  read_input_particles(cin, input_particles);
  
  // we will have four jet definitions, and the first two will be
  // plugins
  vector<fastjet::JetDefinition> jet_defs(5);
  vector<fastjet::JetDefinition::Plugin *> plugins(3);

  // common parameters
  double jet_radius = 0.7;
  //double jet_radius = 1.0;
  double overlap_threshold = 0.5;


  // set up a pxcone jet definition
  double min_jet_energy = 5.0;
  bool   E_scheme_jets = false;
  plugins[0] = new fastjet::PxConePlugin (jet_radius, min_jet_energy, 
                                         overlap_threshold, E_scheme_jets);
  jet_defs[0] = fastjet::JetDefinition(plugins[0]);



  // set up a CDF midpoint jet definition
  double seed_threshold = 1.0;
  double cone_area_fraction = 1.0;
  int    max_pair_size = 2;
  int    max_iterations = 100;
  plugins[1] = new fastjet::CDFMidPointPlugin (seed_threshold, jet_radius, 
                                          cone_area_fraction, max_pair_size,
                                          max_iterations, overlap_threshold);
  jet_defs[1] = fastjet::JetDefinition(plugins[1]);
  

  // set up a siscone jet definition
  int npass = 0;               // do infinite number of passes
  double protojet_ptmin = 0.0; // use all protojets
  plugins[2] = new fastjet::SISConePlugin (jet_radius, overlap_threshold, 
                                           npass, protojet_ptmin);
  jet_defs[2] = fastjet::JetDefinition(plugins[2]);

  // set up kt and cam/aachen definitions
  jet_defs[3] = fastjet::JetDefinition(fastjet::kt_algorithm, jet_radius);
  jet_defs[4] = fastjet::JetDefinition(fastjet::cambridge_algorithm, 
                                       jet_radius);


  // call the example jet-finding routine with each of jet definitions
  for (vector<fastjet::JetDefinition>::const_iterator jd_it = jet_defs.begin();
       jd_it != jet_defs.end(); jd_it++) {
    run_jet_finder(input_particles, *jd_it);
  }

  // clean up plugin memory.
  delete plugins[0];
  delete plugins[1];
  delete plugins[2];
}

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