ktjet_example.cc File Reference

#include <iostream>
#include <sstream>
#include <vector>
#include "KtJet/KtEvent.h"
#include "KtJet/KtLorentzVector.h"

Include dependency graph for ktjet_example.cc:

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Namespaces
namespace	KtJet
Functions
void	print_jets (const vector< KtLorentzVector > &)
int	main (int argc, char **argv)
	an example program showing how the fastjet_example program would be translated for use with ktjet.

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Function Documentation

int main (  int  argc, char **  argv )

an example program showing how the fastjet_example program would be translated for use with ktjet. Definition at line 24 of file ktjet_example.cc. References print_jets(). { vector<KtLorentzVector> input_particles; // read in input particles double px, py , pz, E; while (cin >> px >> py >> pz >> E) { // create a KtLorentzVector with these components and put it onto // back of the input_particles vector input_particles.push_back(KtLorentzVector(px,py,pz,E)); } // run the inclusive jet clustering in PP mode using the covariant // E-scheme for recobination (type=4, angle=2, recom=1, rparameter=1.0) double Rparam = 1.0; KtEvent clust_seq(input_particles,4,2,1,Rparam); // extract the inclusive jets with pt > 5 GeV, sorted by pt double ptmin = 5.0; vector<KtLorentzVector> temporary_jets = clust_seq.getJetsPt(); vector<KtLorentzVector> inclusive_jets; for (unsigned int i = 0; i < temporary_jets.size(); i++) { if (temporary_jets[i].perp() >= ptmin) { inclusive_jets.push_back(temporary_jets[i]);} else {break;} } // print them out cout << "Printing inclusive jets with pt > "<< ptmin<<" GeV\n"; cout << "---------------------------------------\n"; print_jets(inclusive_jets); cout << endl; // Extract the exclusive jets with dcut = 25 GeV^2. double dcut = 25.0; // Note that KtJet's definition of dij differs from Ellis&Soper (and // fastjet) in the case where Rparam /= 1.0 (though in this case one // should perhaps not be using the exclusive kt algorithm in any case). clust_seq.findJetsD(dcut * Rparam*Rparam); vector<KtLorentzVector> exclusive_jets = clust_seq.getJetsPt(); // print them out cout << "Printing exclusive jets with dcut = "<< dcut<<" GeV^2\n"; cout << "--------------------------------------------\n"; print_jets(exclusive_jets); }

void print_jets (  const vector< KtLorentzVector > &   )

Definition at line 76 of file ktjet_example.cc. { // label the columns printf("%5s %15s %15s %15s %15s\n","jet #", "rapidity", "phi", "pt", "n constituents"); // print out the details for each jet for (unsigned int i = 0; i < jets.size(); i++) { int n_constituents = jets[i].getConstituents().size(); double phi = jets[i].phi(); if (phi < 0.0) {phi += 6.283185307179586476925286766559005768394;} printf("%5u %15.8f %15.8f %15.8f %8u\n", i, jets[i].rapidity(), phi, jets[i].perp(), n_constituents); } }

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