1 | //STARTHEADER |
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2 | // $Id: CDFJetCluPlugin.cc 859 2012-11-28 01:49:23Z pavel $ |
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3 | // |
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4 | // Copyright (c) 2005-2011, Matteo Cacciari, Gavin P. Salam and Gregory Soyez |
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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, see <http://www.gnu.org/licenses/>. |
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26 | //---------------------------------------------------------------------- |
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27 | //ENDHEADER |
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28 | |
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29 | #include "fastjet/CDFJetCluPlugin.hh" |
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30 | #include "fastjet/ClusterSequence.hh" |
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31 | #include <sstream> |
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32 | #include <cassert> |
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33 | |
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34 | // CDF stuff |
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35 | #include "JetCluAlgorithm.hh" |
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36 | #include "PhysicsTower.hh" |
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37 | #include "Cluster.hh" |
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38 | |
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39 | FASTJET_BEGIN_NAMESPACE // defined in fastjet/internal/base.hh |
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40 | |
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41 | using namespace std; |
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42 | using namespace cdf; |
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43 | |
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44 | bool CDFJetCluPlugin::_first_time = true; |
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45 | |
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46 | string CDFJetCluPlugin::description () const { |
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47 | ostringstream desc; |
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48 | |
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49 | desc << "CDF JetClu jet algorithm with " |
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50 | << "seed_threshold = " << seed_threshold () << ", " |
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51 | << "cone_radius = " << cone_radius () << ", " |
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52 | << "adjacency_cut = " << adjacency_cut () << ", " |
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53 | << "max_iterations = " << max_iterations () << ", " |
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54 | << "iratch = " << iratch () << ", " |
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55 | << "overlap_threshold = " << overlap_threshold () ; |
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56 | |
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57 | return desc.str(); |
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58 | } |
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59 | |
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60 | |
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61 | void CDFJetCluPlugin::run_clustering(ClusterSequence & clust_seq) const { |
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62 | // print a banner if we run this for the first time |
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63 | _print_banner(clust_seq.fastjet_banner_stream()); |
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64 | |
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65 | // create the physics towers needed by the CDF code |
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66 | vector<PhysicsTower> towers; |
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67 | towers.reserve(clust_seq.jets().size()); |
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68 | |
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69 | // create a map to identify jets (actually just the input particles)... |
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70 | //map<double,int> jetmap; |
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71 | |
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72 | for (unsigned i = 0; i < clust_seq.jets().size(); i++) { |
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73 | PseudoJet particle(clust_seq.jets()[i]); |
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74 | //_insert_unique(particle, jetmap); |
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75 | LorentzVector fourvect(particle.px(), particle.py(), |
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76 | particle.pz(), particle.E()); |
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77 | PhysicsTower tower(fourvect); |
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78 | // add tracking information for later |
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79 | tower.fjindex = i; |
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80 | towers.push_back(tower); |
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81 | } |
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82 | |
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83 | // prepare the CDF algorithm |
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84 | JetCluAlgorithm j(seed_threshold(), cone_radius(), adjacency_cut(), |
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85 | max_iterations(), iratch(), overlap_threshold()); |
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86 | |
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87 | // run the CDF algorithm |
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88 | std::vector<Cluster> jets; |
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89 | j.run(towers,jets); |
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90 | |
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91 | |
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92 | // now transfer the jets back into our own structure -- we will |
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93 | // mimic the cone code with a sequential recombination sequence in |
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94 | // which the jets are built up by adding one particle at a time |
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95 | |
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96 | // NB: with g++-4.0, the reverse iterator code gave problems, so switch |
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97 | // to indices instead |
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98 | //for(vector<Cluster>::const_reverse_iterator jetIter = jets.rbegin(); |
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99 | // jetIter != jets.rend(); jetIter++) { |
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100 | // const vector<PhysicsTower> & tower_list = jetIter->towerList; |
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101 | // int jet_k = jetmap[tower_list[0].fourVector.E]; |
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102 | // |
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103 | // int ntow = int(jetIter->towerList.size()); |
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104 | |
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105 | for(int iCDFjets = jets.size()-1; iCDFjets >= 0; iCDFjets--) { |
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106 | |
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107 | const vector<PhysicsTower> & tower_list = jets[iCDFjets].towerList; |
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108 | int ntow = int(tower_list.size()); |
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109 | |
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110 | // 2008-09-04: sort the towerList (according to fjindex) so as |
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111 | // to have a consistent order for particles in jet |
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112 | // (necessary because addition of ultra-soft particles |
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113 | // sometimes often modifies the order, while maintaining |
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114 | // the same overall set) |
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115 | vector<int> jc_indices(ntow); |
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116 | vector<double> fj_indices(ntow); // use double: benefit from existing routine |
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117 | for (int itow = 0; itow < ntow; itow++) { |
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118 | jc_indices[itow] = itow; |
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119 | fj_indices[itow] = tower_list[itow].fjindex; |
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120 | } |
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121 | sort_indices(jc_indices, fj_indices); |
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122 | |
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123 | int jet_k = tower_list[jc_indices[0]].fjindex; |
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124 | |
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125 | for (int itow = 1; itow < ntow; itow++) { |
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126 | if (tower_list[jc_indices[itow]].Et() > 1e-50) { |
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127 | } |
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128 | int jet_i = jet_k; |
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129 | // retrieve our index for the jet |
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130 | int jet_j; |
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131 | jet_j = tower_list[jc_indices[itow]].fjindex; |
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132 | |
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133 | // safety check |
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134 | assert (jet_j >= 0 && jet_j < int(towers.size())); |
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135 | |
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136 | // do a fake recombination step with dij=0 |
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137 | double dij = 0.0; |
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138 | |
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139 | // JetClu does E-scheme recombination so we can stick with the |
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140 | // simple option |
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141 | clust_seq.plugin_record_ij_recombination(jet_i, jet_j, dij, jet_k); |
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142 | |
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143 | } |
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144 | |
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145 | // NB: put a sensible looking d_iB just to be nice... |
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146 | double d_iB = clust_seq.jets()[jet_k].perp2(); |
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147 | clust_seq.plugin_record_iB_recombination(jet_k, d_iB); |
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148 | } |
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149 | |
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150 | |
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151 | // following code is for testing only |
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152 | //cout << endl; |
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153 | //for(vector<Cluster>::const_iterator jetIter = jets.begin(); |
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154 | // jetIter != jets.end(); jetIter++) { |
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155 | // cout << jetIter->fourVector.pt() << " " << jetIter->fourVector.y() << endl; |
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156 | //} |
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157 | //cout << "-----------------------------------------------------\n"; |
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158 | //vector<PseudoJet> ourjets(clust_seq.inclusive_jets()); |
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159 | //for (vector<PseudoJet>::const_iterator ourjet = ourjets.begin(); |
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160 | // ourjet != ourjets.end(); ourjet++) { |
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161 | // cout << ourjet->perp() << " " << ourjet->rap() << endl; |
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162 | //} |
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163 | //cout << endl; |
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164 | } |
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165 | |
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166 | |
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167 | // print a banner for reference to the 3rd-party code |
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168 | void CDFJetCluPlugin::_print_banner(ostream *ostr) const{ |
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169 | if (! _first_time) return; |
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170 | _first_time=false; |
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171 | |
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172 | // make sure the user has not set the banner stream to NULL |
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173 | if (!ostr) return; |
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174 | |
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175 | (*ostr) << "#-------------------------------------------------------------------------" << endl; |
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176 | (*ostr) << "# You are running the CDF JetClu plugin for FastJet " << endl; |
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177 | (*ostr) << "# This is based on an implementation provided by Joey Huston. " << endl; |
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178 | (*ostr) << "# If you use this plugin, please cite " << endl; |
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179 | (*ostr) << "# F. Abe et al. [CDF Collaboration], Phys. Rev. D 45 (1992) 1448. " << endl; |
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180 | (*ostr) << "# in addition to the usual FastJet reference. " << endl; |
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181 | (*ostr) << "#-------------------------------------------------------------------------" << endl; |
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182 | |
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183 | // make sure we really have the output done. |
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184 | ostr->flush(); |
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185 | } |
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186 | |
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187 | FASTJET_END_NAMESPACE // defined in fastjet/internal/base.hh |
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