FastJet 3.0.2
|
00001 //STARTHEADER 00002 // $Id: CDFJetCluPlugin.cc 2777 2011-11-25 15:01:56Z soyez $ 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 bool CDFJetCluPlugin::_first_time = true; 00045 00046 string CDFJetCluPlugin::description () const { 00047 ostringstream desc; 00048 00049 desc << "CDF JetClu jet algorithm with " 00050 << "seed_threshold = " << seed_threshold () << ", " 00051 << "cone_radius = " << cone_radius () << ", " 00052 << "adjacency_cut = " << adjacency_cut () << ", " 00053 << "max_iterations = " << max_iterations () << ", " 00054 << "iratch = " << iratch () << ", " 00055 << "overlap_threshold = " << overlap_threshold () ; 00056 00057 return desc.str(); 00058 } 00059 00060 00061 void CDFJetCluPlugin::run_clustering(ClusterSequence & clust_seq) const { 00062 // print a banner if we run this for the first time 00063 _print_banner(clust_seq.fastjet_banner_stream()); 00064 00065 // create the physics towers needed by the CDF code 00066 vector<PhysicsTower> towers; 00067 towers.reserve(clust_seq.jets().size()); 00068 00069 // create a map to identify jets (actually just the input particles)... 00070 //map<double,int> jetmap; 00071 00072 for (unsigned i = 0; i < clust_seq.jets().size(); i++) { 00073 PseudoJet particle(clust_seq.jets()[i]); 00074 //_insert_unique(particle, jetmap); 00075 LorentzVector fourvect(particle.px(), particle.py(), 00076 particle.pz(), particle.E()); 00077 PhysicsTower tower(fourvect); 00078 // add tracking information for later 00079 tower.fjindex = i; 00080 towers.push_back(tower); 00081 } 00082 00083 // prepare the CDF algorithm 00084 JetCluAlgorithm j(seed_threshold(), cone_radius(), adjacency_cut(), 00085 max_iterations(), iratch(), overlap_threshold()); 00086 00087 // run the CDF algorithm 00088 std::vector<Cluster> jets; 00089 j.run(towers,jets); 00090 00091 00092 // now transfer the jets back into our own structure -- we will 00093 // mimic the cone code with a sequential recombination sequence in 00094 // which the jets are built up by adding one particle at a time 00095 00096 // NB: with g++-4.0, the reverse iterator code gave problems, so switch 00097 // to indices instead 00098 //for(vector<Cluster>::const_reverse_iterator jetIter = jets.rbegin(); 00099 // jetIter != jets.rend(); jetIter++) { 00100 // const vector<PhysicsTower> & tower_list = jetIter->towerList; 00101 // int jet_k = jetmap[tower_list[0].fourVector.E]; 00102 // 00103 // int ntow = int(jetIter->towerList.size()); 00104 00105 for(int iCDFjets = jets.size()-1; iCDFjets >= 0; iCDFjets--) { 00106 00107 const vector<PhysicsTower> & tower_list = jets[iCDFjets].towerList; 00108 int ntow = int(tower_list.size()); 00109 00110 // 2008-09-04: sort the towerList (according to fjindex) so as 00111 // to have a consistent order for particles in jet 00112 // (necessary because addition of ultra-soft particles 00113 // sometimes often modifies the order, while maintaining 00114 // the same overall set) 00115 vector<int> jc_indices(ntow); 00116 vector<double> fj_indices(ntow); // use double: benefit from existing routine 00117 for (int itow = 0; itow < ntow; itow++) { 00118 jc_indices[itow] = itow; 00119 fj_indices[itow] = tower_list[itow].fjindex; 00120 } 00121 sort_indices(jc_indices, fj_indices); 00122 00123 int jet_k = tower_list[jc_indices[0]].fjindex; 00124 00125 for (int itow = 1; itow < ntow; itow++) { 00126 if (tower_list[jc_indices[itow]].Et() > 1e-50) { 00127 } 00128 int jet_i = jet_k; 00129 // retrieve our index for the jet 00130 int jet_j; 00131 jet_j = tower_list[jc_indices[itow]].fjindex; 00132 00133 // safety check 00134 assert (jet_j >= 0 && jet_j < int(towers.size())); 00135 00136 // do a fake recombination step with dij=0 00137 double dij = 0.0; 00138 00139 // JetClu does E-scheme recombination so we can stick with the 00140 // simple option 00141 clust_seq.plugin_record_ij_recombination(jet_i, jet_j, dij, jet_k); 00142 00143 } 00144 00145 // NB: put a sensible looking d_iB just to be nice... 00146 double d_iB = clust_seq.jets()[jet_k].perp2(); 00147 clust_seq.plugin_record_iB_recombination(jet_k, d_iB); 00148 } 00149 00150 00151 // following code is for testing only 00152 //cout << endl; 00153 //for(vector<Cluster>::const_iterator jetIter = jets.begin(); 00154 // jetIter != jets.end(); jetIter++) { 00155 // cout << jetIter->fourVector.pt() << " " << jetIter->fourVector.y() << endl; 00156 //} 00157 //cout << "-----------------------------------------------------\n"; 00158 //vector<PseudoJet> ourjets(clust_seq.inclusive_jets()); 00159 //for (vector<PseudoJet>::const_iterator ourjet = ourjets.begin(); 00160 // ourjet != ourjets.end(); ourjet++) { 00161 // cout << ourjet->perp() << " " << ourjet->rap() << endl; 00162 //} 00163 //cout << endl; 00164 } 00165 00166 00167 // print a banner for reference to the 3rd-party code 00168 void CDFJetCluPlugin::_print_banner(ostream *ostr) const{ 00169 if (! _first_time) return; 00170 _first_time=false; 00171 00172 // make sure the user has not set the banner stream to NULL 00173 if (!ostr) return; 00174 00175 (*ostr) << "#-------------------------------------------------------------------------" << endl; 00176 (*ostr) << "# You are running the CDF JetClu plugin for FastJet " << endl; 00177 (*ostr) << "# This is based on an implementation provided by Joey Huston. " << endl; 00178 (*ostr) << "# If you use this plugin, please cite " << endl; 00179 (*ostr) << "# F. Abe et al. [CDF Collaboration], Phys. Rev. D 45 (1992) 1448. " << endl; 00180 (*ostr) << "# in addition to the usual FastJet reference. " << endl; 00181 (*ostr) << "#-------------------------------------------------------------------------" << endl; 00182 00183 // make sure we really have the output done. 00184 ostr->flush(); 00185 } 00186 00187 FASTJET_END_NAMESPACE // defined in fastjet/internal/base.hh