1 | //STARTHEADER |
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2 | // $Id: CDFMidPointPlugin.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/CDFMidPointPlugin.hh" |
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30 | #include "fastjet/ClusterSequence.hh" |
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31 | #include "fastjet/Error.hh" |
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32 | #include <sstream> |
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33 | |
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34 | // CDF stuff |
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35 | #include "MidPointAlgorithm.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 CDFMidPointPlugin::_first_time = true; |
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45 | |
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46 | string CDFMidPointPlugin::description () const { |
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47 | ostringstream desc; |
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48 | |
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49 | string sm_scale_string = "split-merge uses "; |
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50 | switch(_sm_scale) { |
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51 | case SM_pt: |
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52 | sm_scale_string += "pt"; |
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53 | break; |
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54 | case SM_Et: |
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55 | sm_scale_string += "Et"; |
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56 | break; |
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57 | case SM_mt: |
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58 | sm_scale_string += "mt"; |
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59 | break; |
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60 | case SM_pttilde: |
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61 | sm_scale_string += "pttilde (scalar sum of pts)"; |
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62 | break; |
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63 | default: |
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64 | ostringstream err; |
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65 | err << "Unrecognized split-merge scale choice = " << _sm_scale; |
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66 | throw Error(err.str()); |
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67 | } |
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68 | |
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69 | |
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70 | if (cone_area_fraction() == 1) { |
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71 | desc << "CDF MidPoint jet algorithm, with " ; |
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72 | } else { |
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73 | desc << "CDF MidPoint+Searchcone jet algorithm, with "; |
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74 | } |
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75 | desc << "seed_threshold = " << seed_threshold () << ", " |
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76 | << "cone_radius = " << cone_radius () << ", " |
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77 | << "cone_area_fraction = " << cone_area_fraction () << ", " |
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78 | << "max_pair_size = " << max_pair_size () << ", " |
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79 | << "max_iterations = " << max_iterations () << ", " |
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80 | << "overlap_threshold = " << overlap_threshold () << ", " |
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81 | << sm_scale_string ; |
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82 | |
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83 | return desc.str(); |
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84 | } |
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85 | |
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86 | |
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87 | void CDFMidPointPlugin::run_clustering(ClusterSequence & clust_seq) const { |
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88 | // print a banner if we run this for the first time |
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89 | _print_banner(clust_seq.fastjet_banner_stream()); |
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90 | |
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91 | // create the physics towers needed by the CDF code |
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92 | vector<PhysicsTower> towers; |
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93 | towers.reserve(clust_seq.jets().size()); |
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94 | for (unsigned i = 0; i < clust_seq.jets().size(); i++) { |
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95 | LorentzVector fourvect(clust_seq.jets()[i].px(), |
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96 | clust_seq.jets()[i].py(), |
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97 | clust_seq.jets()[i].pz(), |
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98 | clust_seq.jets()[i].E()); |
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99 | PhysicsTower tower(fourvect); |
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100 | // misuse one of the indices for tracking, since the MidPoint |
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101 | // implementation doesn't seem to make use of these indices |
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102 | tower.calTower.iEta = i; |
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103 | towers.push_back(tower); |
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104 | } |
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105 | |
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106 | // prepare the CDF algorithm |
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107 | MidPointAlgorithm m(_seed_threshold,_cone_radius,_cone_area_fraction, |
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108 | _max_pair_size,_max_iterations,_overlap_threshold, |
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109 | MidPointAlgorithm::SplitMergeScale(_sm_scale)); |
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110 | |
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111 | // run the CDF algorithm |
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112 | std::vector<Cluster> jets; |
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113 | m.run(towers,jets); |
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114 | |
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115 | |
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116 | // now transfer the jets back into our own structure -- we will |
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117 | // mimic the cone code with a sequential recombination sequence in |
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118 | // which the jets are built up by adding one particle at a time |
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119 | for(vector<Cluster>::const_iterator jetIter = jets.begin(); |
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120 | jetIter != jets.end(); jetIter++) { |
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121 | const vector<PhysicsTower> & tower_list = jetIter->towerList; |
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122 | int jet_k = tower_list[0].calTower.iEta; |
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123 | |
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124 | int ntow = int(jetIter->towerList.size()); |
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125 | for (int itow = 1; itow < ntow; itow++) { |
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126 | int jet_i = jet_k; |
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127 | // retrieve our misappropriated index for the jet |
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128 | int jet_j = tower_list[itow].calTower.iEta; |
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129 | // do a fake recombination step with dij=0 |
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130 | double dij = 0.0; |
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131 | clust_seq.plugin_record_ij_recombination(jet_i, jet_j, dij, jet_k); |
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132 | } |
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133 | |
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134 | // NB: put a sensible looking d_iB just to be nice... |
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135 | double d_iB = clust_seq.jets()[jet_k].perp2(); |
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136 | clust_seq.plugin_record_iB_recombination(jet_k, d_iB); |
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137 | } |
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138 | |
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139 | |
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140 | // following code is for testing only |
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141 | //cout << endl; |
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142 | //for(vector<Cluster>::const_iterator jetIter = jets.begin(); |
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143 | // jetIter != jets.end(); jetIter++) { |
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144 | // cout << jetIter->fourVector.pt() << " " << jetIter->fourVector.y() << endl; |
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145 | //} |
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146 | //cout << "-----------------------------------------------------\n"; |
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147 | //vector<PseudoJet> ourjets(clust_seq.inclusive_jets()); |
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148 | //for (vector<PseudoJet>::const_reverse_iterator ourjet = ourjets.rbegin(); |
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149 | // ourjet != ourjets.rend(); ourjet++) { |
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150 | // cout << ourjet->perp() << " " << ourjet->rap() << endl; |
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151 | //} |
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152 | //cout << endl; |
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153 | } |
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154 | |
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155 | // print a banner for reference to the 3rd-party code |
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156 | void CDFMidPointPlugin::_print_banner(ostream *ostr) const{ |
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157 | if (! _first_time) return; |
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158 | _first_time=false; |
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159 | |
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160 | // make sure the user has not set the banner stream to NULL |
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161 | if (!ostr) return; |
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162 | |
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163 | (*ostr) << "#-------------------------------------------------------------------------" << endl; |
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164 | (*ostr) << "# You are running the CDF MidPoint plugin for FastJet " << endl; |
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165 | (*ostr) << "# This is based on an implementation provided by Joey Huston. " << endl; |
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166 | (*ostr) << "# If you use this plugin, please cite " << endl; |
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167 | (*ostr) << "# G. C. Blazey et al., hep-ex/0005012. " << endl; |
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168 | (*ostr) << "# in addition to the usual FastJet reference. " << endl; |
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169 | (*ostr) << "#-------------------------------------------------------------------------" << endl; |
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170 | |
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171 | // make sure we really have the output done. |
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172 | ostr->flush(); |
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173 | } |
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174 | |
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175 | FASTJET_END_NAMESPACE // defined in fastjet/internal/base.hh |
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