| 1 | //STARTHEADER
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| 2 | // $Id: CDFJetCluPlugin.cc,v 1.1 2008-11-06 14:32:10 ovyn Exp $
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| 3 | //
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| 4 | // Copyright (c) 2005-2006, Matteo Cacciari and Gavin Salam
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| 5 | //
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| 6 | //----------------------------------------------------------------------
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| 7 | // This file is part of FastJet.
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| 8 | //
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| 9 | // FastJet is free software; you can redistribute it and/or modify
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| 10 | // it under the terms of the GNU General Public License as published by
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| 11 | // the Free Software Foundation; either version 2 of the License, or
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| 12 | // (at your option) any later version.
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| 13 | //
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| 14 | // The algorithms that underlie FastJet have required considerable
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| 15 | // development and are described in hep-ph/0512210. If you use
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| 16 | // FastJet as part of work towards a scientific publication, please
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| 17 | // include a citation to the FastJet paper.
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| 18 | //
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| 19 | // FastJet is distributed in the hope that it will be useful,
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| 20 | // but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 21 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 22 | // GNU General Public License for more details.
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| 23 | //
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| 24 | // You should have received a copy of the GNU General Public License
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| 25 | // along with FastJet; if not, write to the Free Software
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| 26 | // Foundation, Inc.:
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| 27 | // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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| 28 | //----------------------------------------------------------------------
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| 29 | //ENDHEADER
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| 30 |
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| 31 | #include "CDFJetCluPlugin.hh"
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| 32 | #include "Utilities/Fastjet/include/fastjet/ClusterSequence.hh"
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| 33 | #include <sstream>
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| 34 | #include <cassert>
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| 35 |
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| 36 | // CDF stuff
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| 37 | #include "interface/JetCluAlgorithm.hh"
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| 38 | #include "interface/PhysicsTower.hh"
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| 39 | #include "interface/Cluster.hh"
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| 40 |
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| 41 | FASTJET_BEGIN_NAMESPACE // defined in fastjet/internal/base.hh
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| 42 |
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| 43 | using namespace std;
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| 44 |
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| 45 | string CDFJetCluPlugin::description () const {
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| 46 | ostringstream desc;
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| 47 |
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| 48 | desc << "CDF JetClu jet algorithm with "
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| 49 | << "seed_threshold = " << seed_threshold () << ", "
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| 50 | << "cone_radius = " << cone_radius () << ", "
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| 51 | << "adjacency_cut = " << adjacency_cut () << ", "
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| 52 | << "max_iterations = " << max_iterations () << ", "
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| 53 | << "iratch = " << iratch () << ", "
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| 54 | << "overlap_threshold = " << overlap_threshold () ;
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| 55 |
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| 56 | return desc.str();
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| 57 | }
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| 58 |
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| 59 |
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| 60 | void CDFJetCluPlugin::run_clustering(ClusterSequence & clust_seq) const {
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| 61 |
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| 62 | // create the physics towers needed by the CDF code
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| 63 | vector<PhysicsTower> towers;
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| 64 | towers.reserve(clust_seq.jets().size());
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| 65 |
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| 66 | // create a map to identify jets (actually just the input particles)...
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| 67 | //map<double,int> jetmap;
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| 68 |
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| 69 | for (unsigned i = 0; i < clust_seq.jets().size(); i++) {
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| 70 | PseudoJet particle(clust_seq.jets()[i]);
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| 71 | //_insert_unique(particle, jetmap);
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| 72 | LorentzVector fourvect(particle.px(), particle.py(),
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| 73 | particle.pz(), particle.E());
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| 74 | PhysicsTower tower(fourvect);
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| 75 | // add tracking information for later
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| 76 | tower.fjindex = i;
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| 77 | towers.push_back(tower);
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| 78 | }
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| 79 |
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| 80 | // prepare the CDF algorithm
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| 81 | JetCluAlgorithm j(seed_threshold(), cone_radius(), adjacency_cut(),
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| 82 | max_iterations(), iratch(), overlap_threshold());
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| 83 |
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| 84 | // run the CDF algorithm
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| 85 | std::vector<Cluster> jets;
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| 86 | j.run(towers,jets);
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| 87 |
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| 88 |
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| 89 | // now transfer the jets back into our own structure -- we will
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| 90 | // mimic the cone code with a sequential recombination sequence in
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| 91 | // which the jets are built up by adding one particle at a time
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| 92 |
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| 93 | // NB: with g++-4.0, the reverse iterator code gave problems, so switch
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| 94 | // to indices instead
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| 95 | //for(vector<Cluster>::const_reverse_iterator jetIter = jets.rbegin();
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| 96 | // jetIter != jets.rend(); jetIter++) {
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| 97 | // const vector<PhysicsTower> & tower_list = jetIter->towerList;
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| 98 | // int jet_k = jetmap[tower_list[0].fourVector.E];
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| 99 | //
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| 100 | // int ntow = int(jetIter->towerList.size());
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| 101 |
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| 102 | for(int iCDFjets = jets.size()-1; iCDFjets >= 0; iCDFjets--) {
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| 103 | const vector<PhysicsTower> & tower_list = jets[iCDFjets].towerList;
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| 104 | //int jet_k = jetmap[tower_list[0].fourVector.E];
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| 105 | int jet_k = tower_list[0].fjindex;
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| 106 |
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| 107 | int ntow = int(tower_list.size());
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| 108 | for (int itow = 1; itow < ntow; itow++) {
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| 109 | int jet_i = jet_k;
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| 110 | // retrieve our misappropriated index for the jet
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| 111 | int jet_j;
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| 112 | jet_j = tower_list[itow].fjindex;
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| 113 | //int alt_jet_j = jetmap[tower_list[itow].fourVector.E];
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| 114 | //assert(jet_j == alt_jet_j);
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| 115 | //cout << jet_j << endl;
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| 116 | // safety check
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| 117 | assert (jet_j >= 0 && jet_j < int(towers.size()));
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| 118 | // do a fake recombination step with dij=0
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| 119 | double dij = 0.0;
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| 120 | // JetClu does E-scheme recombination so we can stick with the
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| 121 | // simple option
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| 122 | clust_seq.plugin_record_ij_recombination(jet_i, jet_j, dij, jet_k);
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| 123 | //if (itow != ntow) {
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| 124 | // clust_seq.plugin_record_ij_recombination(jet_i, jet_j, dij, jet_k);
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| 125 | //} else {
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| 126 | // clust_seq.plugin_record_ij_recombination(jet_i, jet_j, dij,
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| 127 | // PseudoJet(jetIter->fourVector.px,jetIter->fourVector.py,
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| 128 | // jetIter->fourVector.pz,jetIter->fourVector.E),
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| 129 | // jet_k);
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| 130 | //}
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| 131 | }
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| 132 |
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| 133 | // NB: put a sensible looking d_iB just to be nice...
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| 134 | double d_iB = clust_seq.jets()[jet_k].perp2();
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| 135 | clust_seq.plugin_record_iB_recombination(jet_k, d_iB);
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| 136 | }
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| 137 |
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| 138 |
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| 139 | // following code is for testing only
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| 140 | //cout << endl;
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| 141 | //for(vector<Cluster>::const_iterator jetIter = jets.begin();
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| 142 | // jetIter != jets.end(); jetIter++) {
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| 143 | // cout << jetIter->fourVector.pt() << " " << jetIter->fourVector.y() << endl;
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| 144 | //}
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| 145 | //cout << "-----------------------------------------------------\n";
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| 146 | //vector<PseudoJet> ourjets(clust_seq.inclusive_jets());
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| 147 | //for (vector<PseudoJet>::const_iterator ourjet = ourjets.begin();
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| 148 | // ourjet != ourjets.end(); ourjet++) {
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| 149 | // cout << ourjet->perp() << " " << ourjet->rap() << endl;
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| 150 | //}
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| 151 | //cout << endl;
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| 152 | }
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| 153 |
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| 154 |
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| 155 | //// following code should now be obsolete since addition of
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| 156 | //// index to the physics tower in the CDF code
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| 157 | // void CDFJetCluPlugin::_insert_unique(PseudoJet & jet,
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| 158 | // map<double,int> & jetmap) const {
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| 159 | // while (jetmap.find(jet.E()) != jetmap.end()) {
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| 160 | // // deal with cases where something else has the same energy, and
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| 161 | // // also with situation where that energy is zero.
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| 162 | // if (jet.E() != 0.0) {
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| 163 | // jet *= 1.0+1e-12;
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| 164 | // } else {
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| 165 | // jet += PseudoJet(0.0,0.0,0.0,1e-300);
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| 166 | // }
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| 167 | // }
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| 168 | // jetmap[jet.E()] = jet.cluster_hist_index();
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| 169 | // }
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| 170 |
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| 171 |
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| 172 | FASTJET_END_NAMESPACE // defined in fastjet/internal/base.hh
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