fastjet_subjets.cc
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00042 #include "fastjet/PseudoJet.hh"
00043 #include "fastjet/ClusterSequence.hh"
00044 #include<iostream>
00045 #include<sstream>
00046 #include<vector>
00047 #include <cstdio>
00048
00049 using namespace std;
00050
00051
00052
00053 namespace fj = fastjet;
00054
00055
00056
00057 void print_jets (const fj::ClusterSequence &,
00058 const vector<fj::PseudoJet> &);
00059
00060
00061 void print_jet (const fj::ClusterSequence & clust_seq,
00062 const fj::PseudoJet & jet);
00063
00064
00065 void print_jets_and_sub (const fj::ClusterSequence & clust_seq,
00066 const vector<fj::PseudoJet> & jets,
00067 double dcut);
00068
00070 int main (int argc, char ** argv) {
00071
00072 vector<fj::PseudoJet> input_particles;
00073
00074
00075 double px, py , pz, E;
00076 while (cin >> px >> py >> pz >> E) {
00077
00078
00079 input_particles.push_back(fj::PseudoJet(px,py,pz,E));
00080 }
00081
00082
00083 double R = 1.0;
00084
00085 fj::JetDefinition cam_def(fj::cambridge_algorithm, R);
00086
00087
00088
00089 fj::ClusterSequence cam_seq(input_particles, cam_def);
00090
00091
00092 cout << "Ran " << cam_def.description() << endl;
00093 cout << "Strategy adopted by FastJet was "<<
00094 cam_seq.strategy_string()<<endl<<endl;
00095
00096
00097 double ptmin = 5.0;
00098 vector<fj::PseudoJet> inclusive_jets = cam_seq.inclusive_jets(ptmin);
00099
00100
00101 double smallR = 0.4;
00102 double dcut_cam = pow(smallR/R,2);
00103
00104
00105 cout << "Printing inclusive jets (R = "<<R<<") with pt > "<< ptmin<<" GeV\n";
00106 cout << "and their subjets with smallR = " << smallR << "\n";
00107 cout << "---------------------------------------\n";
00108 print_jets_and_sub(cam_seq, inclusive_jets, dcut_cam);
00109 cout << endl;
00110
00111
00112
00113 vector<fj::PseudoJet> exclusive_jets = cam_seq.exclusive_jets(dcut_cam);
00114 cout << "Printing exclusive jets with dcut = "<< dcut_cam<<" \n";
00115 cout << "--------------------------------------------\n";
00116 print_jets(cam_seq, exclusive_jets);
00117
00118
00119 }
00120
00121
00122
00124 void print_jets (const fj::ClusterSequence & clust_seq,
00125 const vector<fj::PseudoJet> & jets) {
00126
00127
00128 vector<fj::PseudoJet> sorted_jets = sorted_by_pt(jets);
00129
00130
00131 printf("%5s %15s %15s %15s %15s\n","jet #", "rapidity",
00132 "phi", "pt", "n constituents");
00133
00134
00135 for (unsigned int i = 0; i < sorted_jets.size(); i++) {
00136 printf("%5u ",i);
00137 print_jet(clust_seq, sorted_jets[i]);
00138 }
00139
00140 }
00141
00142
00143
00145 void print_jets_and_sub (const fj::ClusterSequence & clust_seq,
00146 const vector<fj::PseudoJet> & jets,
00147 double dcut) {
00148
00149
00150 vector<fj::PseudoJet> sorted_jets = sorted_by_pt(jets);
00151
00152
00153 printf("%5s %15s %15s %15s %15s\n","jet #", "rapidity",
00154 "phi", "pt", "n constituents");
00155
00156
00157 for (unsigned int i = 0; i < sorted_jets.size(); i++) {
00158 printf("%5u ",i);
00159 print_jet(clust_seq, sorted_jets[i]);
00160 vector<fj::PseudoJet> subjets =
00161 sorted_by_pt(clust_seq.exclusive_subjets(sorted_jets[i], dcut));
00162 for (unsigned int j = 0; j < subjets.size(); j++) {
00163 printf(" -sub-%02u ",j);
00164 print_jet(clust_seq, subjets[j]);
00165 }
00166 }
00167
00168 }
00169
00170
00171
00173 void print_jet (const fj::ClusterSequence & clust_seq,
00174 const fj::PseudoJet & jet) {
00175 int n_constituents = clust_seq.constituents(jet).size();
00176 printf("%15.8f %15.8f %15.8f %8u\n",
00177 jet.rap(), jet.phi(), jet.perp(), n_constituents);
00178 }