fastjet_areas_2.1.0.cc File Reference

#include "fastjet/PseudoJet.hh"
#include "fastjet/ClusterSequenceActiveArea.hh"
#include <iostream>
#include <sstream>
#include <vector>

Include dependency graph for fastjet_areas_2.1.0.cc:

Go to the source code of this file.

Functions
void	print_jets (const fastjet::ClusterSequenceWithArea &clust_seq, const vector< fastjet::PseudoJet > &unsorted_jets)
	a function that pretty prints a list of jets
int	main (int argc, char **argv)
	an example program showing how to use fastjet

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Function Documentation

int main	(	int	argc,
		char **	argv
	)

an example program showing how to use fastjet

Definition at line 58 of file fastjet_areas_2.1.0.cc.

References fastjet::Best, fastjet::ClusterSequence::inclusive_jets(), fastjet::kt_algorithm, print_jets(), and fastjet::ClusterSequence::strategy_string().

                                  {
  
  vector<fastjet::PseudoJet> input_particles;
  
  // read in input particles
  double px, py , pz, E;
  while (cin >> px >> py >> pz >> E) {
    // create a fastjet::PseudoJet with these components and put it onto
    // back of the input_particles vector
    input_particles.push_back(fastjet::PseudoJet(px,py,pz,E)); 
  }
  
  // create an object that represents your choice of jet finder and 
  // the associated parameters
  double Rparam = 1.0;
  fastjet::Strategy strategy = fastjet::Best;
  fastjet::JetDefinition jet_def(fastjet::kt_algorithm, Rparam, strategy);

  // create an object that specifies how we to define the (active) area
  double ghost_etamax = 6.0;
  int    active_area_repeats = 3;
  double ghost_area    = 0.01;
  fastjet::ActiveAreaSpec area_spec(ghost_etamax, active_area_repeats, 
                                    ghost_area);

  // run the jet clustering with the above jet definition
  fastjet::ClusterSequenceActiveArea clust_seq(input_particles, 
                                               jet_def, area_spec);

  // tell the user what was done
  cout << "Strategy adopted by FastJet was "<<
       clust_seq.strategy_string()<<endl<<endl;

  // extract the inclusive jets with pt > 5 GeV, sorted by pt
  double ptmin = 5.0;
  vector<fastjet::PseudoJet> inclusive_jets = clust_seq.inclusive_jets(ptmin);

  // print them out
  cout << "Printing inclusive jets with pt > "<< ptmin<<" GeV\n";
  cout << "---------------------------------------\n";
  print_jets(clust_seq, inclusive_jets);
  cout << endl;


}

void print_jets	(	const fastjet::ClusterSequenceWithArea &	,
		const vector< fastjet::PseudoJet > &
	)

a function that pretty prints a list of jets

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