FastJet 3.0.0
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00001 //STARTHEADER 00002 // $Id: CDFJetCluPlugin.cc 2577 2011-09-13 15:11:38Z salam $ 00003 // 00004 // Copyright (c) 2005-2011, Matteo Cacciari, Gavin P. Salam and Gregory Soyez 00005 // 00006 //---------------------------------------------------------------------- 00007 // This file is part of FastJet. 00008 // 00009 // FastJet is free software; you can redistribute it and/or modify 00010 // it under the terms of the GNU General Public License as published by 00011 // the Free Software Foundation; either version 2 of the License, or 00012 // (at your option) any later version. 00013 // 00014 // The algorithms that underlie FastJet have required considerable 00015 // development and are described in hep-ph/0512210. If you use 00016 // FastJet as part of work towards a scientific publication, please 00017 // include a citation to the FastJet paper. 00018 // 00019 // FastJet is distributed in the hope that it will be useful, 00020 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00021 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00022 // GNU General Public License for more details. 00023 // 00024 // You should have received a copy of the GNU General Public License 00025 // along with FastJet. If not, see <http://www.gnu.org/licenses/>. 00026 //---------------------------------------------------------------------- 00027 //ENDHEADER 00028 00029 #include "fastjet/CDFJetCluPlugin.hh" 00030 #include "fastjet/ClusterSequence.hh" 00031 #include <sstream> 00032 #include <cassert> 00033 00034 // CDF stuff 00035 #include "JetCluAlgorithm.hh" 00036 #include "PhysicsTower.hh" 00037 #include "Cluster.hh" 00038 00039 FASTJET_BEGIN_NAMESPACE // defined in fastjet/internal/base.hh 00040 00041 using namespace std; 00042 using namespace cdf; 00043 00044 string CDFJetCluPlugin::description () const { 00045 ostringstream desc; 00046 00047 desc << "CDF JetClu jet algorithm with " 00048 << "seed_threshold = " << seed_threshold () << ", " 00049 << "cone_radius = " << cone_radius () << ", " 00050 << "adjacency_cut = " << adjacency_cut () << ", " 00051 << "max_iterations = " << max_iterations () << ", " 00052 << "iratch = " << iratch () << ", " 00053 << "overlap_threshold = " << overlap_threshold () ; 00054 00055 return desc.str(); 00056 } 00057 00058 00059 void CDFJetCluPlugin::run_clustering(ClusterSequence & clust_seq) const { 00060 00061 // create the physics towers needed by the CDF code 00062 vector<PhysicsTower> towers; 00063 towers.reserve(clust_seq.jets().size()); 00064 00065 // create a map to identify jets (actually just the input particles)... 00066 //map<double,int> jetmap; 00067 00068 for (unsigned i = 0; i < clust_seq.jets().size(); i++) { 00069 PseudoJet particle(clust_seq.jets()[i]); 00070 //_insert_unique(particle, jetmap); 00071 LorentzVector fourvect(particle.px(), particle.py(), 00072 particle.pz(), particle.E()); 00073 PhysicsTower tower(fourvect); 00074 // add tracking information for later 00075 tower.fjindex = i; 00076 towers.push_back(tower); 00077 } 00078 00079 // prepare the CDF algorithm 00080 JetCluAlgorithm j(seed_threshold(), cone_radius(), adjacency_cut(), 00081 max_iterations(), iratch(), overlap_threshold()); 00082 00083 // run the CDF algorithm 00084 std::vector<Cluster> jets; 00085 j.run(towers,jets); 00086 00087 00088 // now transfer the jets back into our own structure -- we will 00089 // mimic the cone code with a sequential recombination sequence in 00090 // which the jets are built up by adding one particle at a time 00091 00092 // NB: with g++-4.0, the reverse iterator code gave problems, so switch 00093 // to indices instead 00094 //for(vector<Cluster>::const_reverse_iterator jetIter = jets.rbegin(); 00095 // jetIter != jets.rend(); jetIter++) { 00096 // const vector<PhysicsTower> & tower_list = jetIter->towerList; 00097 // int jet_k = jetmap[tower_list[0].fourVector.E]; 00098 // 00099 // int ntow = int(jetIter->towerList.size()); 00100 00101 for(int iCDFjets = jets.size()-1; iCDFjets >= 0; iCDFjets--) { 00102 00103 const vector<PhysicsTower> & tower_list = jets[iCDFjets].towerList; 00104 int ntow = int(tower_list.size()); 00105 00106 // 2008-09-04: sort the towerList (according to fjindex) so as 00107 // to have a consistent order for particles in jet 00108 // (necessary because addition of ultra-soft particles 00109 // sometimes often modifies the order, while maintaining 00110 // the same overall set) 00111 vector<int> jc_indices(ntow); 00112 vector<double> fj_indices(ntow); // use double: benefit from existing routine 00113 for (int itow = 0; itow < ntow; itow++) { 00114 jc_indices[itow] = itow; 00115 fj_indices[itow] = tower_list[itow].fjindex; 00116 } 00117 sort_indices(jc_indices, fj_indices); 00118 00119 int jet_k = tower_list[jc_indices[0]].fjindex; 00120 00121 for (int itow = 1; itow < ntow; itow++) { 00122 if (tower_list[jc_indices[itow]].Et() > 1e-50) { 00123 } 00124 int jet_i = jet_k; 00125 // retrieve our index for the jet 00126 int jet_j; 00127 jet_j = tower_list[jc_indices[itow]].fjindex; 00128 00129 // safety check 00130 assert (jet_j >= 0 && jet_j < int(towers.size())); 00131 00132 // do a fake recombination step with dij=0 00133 double dij = 0.0; 00134 00135 // JetClu does E-scheme recombination so we can stick with the 00136 // simple option 00137 clust_seq.plugin_record_ij_recombination(jet_i, jet_j, dij, jet_k); 00138 00139 } 00140 00141 // NB: put a sensible looking d_iB just to be nice... 00142 double d_iB = clust_seq.jets()[jet_k].perp2(); 00143 clust_seq.plugin_record_iB_recombination(jet_k, d_iB); 00144 } 00145 00146 00147 // following code is for testing only 00148 //cout << endl; 00149 //for(vector<Cluster>::const_iterator jetIter = jets.begin(); 00150 // jetIter != jets.end(); jetIter++) { 00151 // cout << jetIter->fourVector.pt() << " " << jetIter->fourVector.y() << endl; 00152 //} 00153 //cout << "-----------------------------------------------------\n"; 00154 //vector<PseudoJet> ourjets(clust_seq.inclusive_jets()); 00155 //for (vector<PseudoJet>::const_iterator ourjet = ourjets.begin(); 00156 // ourjet != ourjets.end(); ourjet++) { 00157 // cout << ourjet->perp() << " " << ourjet->rap() << endl; 00158 //} 00159 //cout << endl; 00160 } 00161 00162 00163 00164 FASTJET_END_NAMESPACE // defined in fastjet/internal/base.hh