1 | //STARTHEADER |
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2 | // $Id: NestedDefsPlugin.cc 859 2012-11-28 01:49:23Z pavel $ |
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3 | // |
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4 | // Copyright (c) 2007-2011, 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 | // TODO |
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30 | // ? Maybe one could provide additional recomb. dists as an "extra".; |
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31 | |
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32 | // fastjet stuff |
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33 | #include "fastjet/ClusterSequence.hh" |
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34 | #include "fastjet/NestedDefsPlugin.hh" |
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35 | |
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36 | // other stuff |
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37 | #include <vector> |
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38 | #include <sstream> |
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39 | |
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40 | FASTJET_BEGIN_NAMESPACE // defined in fastjet/internal/base.hh |
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41 | |
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42 | using namespace std; |
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43 | |
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44 | string NestedDefsPlugin::description () const { |
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45 | ostringstream desc; |
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46 | |
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47 | desc << "NestedDefs: successive application of " ; |
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48 | unsigned int i=1; |
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49 | for (list<JetDefinition>::const_iterator it=_defs.begin();it!=_defs.end();it++){ |
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50 | desc << "Definition " << i++ << " [" << it->description() << "] - "; |
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51 | } |
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52 | |
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53 | return desc.str(); |
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54 | } |
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55 | |
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56 | void NestedDefsPlugin::run_clustering(ClusterSequence & clust_seq) const { |
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57 | vector<PseudoJet> momenta; |
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58 | |
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59 | // build the initial list of particles |
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60 | momenta = clust_seq.jets(); |
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61 | unsigned int step_n = momenta.size(); |
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62 | |
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63 | // initialise the conversion table, which works as follows |
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64 | // conversion_table[step_cs_jet_index] = main_cs_jet_index |
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65 | vector<unsigned int> conversion_table(2*step_n); |
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66 | vector<unsigned int> new_conversion_table; |
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67 | for (unsigned int i=0;i<step_n;i++) |
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68 | conversion_table[i]=i; |
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69 | |
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70 | // Now the steps go as follows: |
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71 | // for each definition in the list, |
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72 | // - do the clustering, |
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73 | // - copy the history into the main one |
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74 | // - update the list of momenta and the index conversion table |
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75 | list<JetDefinition>::const_iterator def_iterator = _defs.begin(); |
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76 | unsigned int def_index=0; |
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77 | bool last_def=false; |
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78 | |
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79 | while (def_iterator!=_defs.end()){ |
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80 | last_def = (def_index == (_defs.size()-1)); |
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81 | |
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82 | // do the clustering |
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83 | ClusterSequence step_cs(momenta, *def_iterator); |
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84 | |
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85 | // clear the momenta as we shall fill them again |
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86 | momenta.clear(); |
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87 | new_conversion_table.clear(); |
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88 | |
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89 | // retrieve the history |
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90 | const vector<ClusterSequence::history_element> & step_history = step_cs.history(); |
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91 | |
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92 | // copy the history |
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93 | // note that we skip the initial steps which are just the |
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94 | // declaration of the particles. |
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95 | vector<ClusterSequence::history_element>::const_iterator |
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96 | hist_iterator = step_history.begin(); |
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97 | |
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98 | for (unsigned int i=step_n;i!=0;i--) |
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99 | hist_iterator++; |
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100 | |
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101 | while (hist_iterator != step_history.end()){ |
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102 | // check if it is a recombination with the beam or a simple recombination |
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103 | if (hist_iterator->parent2 == ClusterSequence::BeamJet){ |
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104 | // save this jet for future clustering |
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105 | // unless we've reached the last def in which case, record the clustering |
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106 | unsigned int step_jet_index = step_cs.history()[hist_iterator->parent1].jetp_index; |
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107 | if (last_def){ |
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108 | clust_seq.plugin_record_iB_recombination(conversion_table[step_jet_index], |
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109 | hist_iterator->dij); |
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110 | } else { |
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111 | momenta.push_back(step_cs.jets()[step_jet_index]); |
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112 | new_conversion_table.push_back(conversion_table[step_jet_index]); |
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113 | } |
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114 | } else { |
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115 | // record combination |
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116 | // note that we set the recombination distance to 0 except for the last alg |
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117 | unsigned int step_jet1_index = step_cs.history()[hist_iterator->parent1].jetp_index; |
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118 | unsigned int step_jet2_index = step_cs.history()[hist_iterator->parent2].jetp_index; |
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119 | PseudoJet newjet = step_cs.jets()[hist_iterator->jetp_index]; |
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120 | int jet_k; |
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121 | clust_seq.plugin_record_ij_recombination(conversion_table[step_jet1_index], |
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122 | conversion_table[step_jet2_index], |
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123 | last_def ? hist_iterator->dij : 0.0, |
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124 | newjet, jet_k); |
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125 | |
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126 | // save info in the conversion table for tracking purposes |
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127 | conversion_table[hist_iterator->jetp_index]=jet_k; |
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128 | } |
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129 | |
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130 | // go to the next history element |
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131 | hist_iterator++; |
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132 | } |
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133 | |
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134 | // finalise this step: |
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135 | // - update nr of particles |
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136 | // - update conversion table |
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137 | step_n = momenta.size(); |
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138 | for (unsigned int i=0;i<step_n;i++) |
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139 | conversion_table[i] = new_conversion_table[i]; |
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140 | |
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141 | // go to the next alg |
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142 | def_index++; |
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143 | def_iterator++; |
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144 | } |
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145 | |
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146 | } |
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147 | |
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148 | FASTJET_END_NAMESPACE // defined in fastjet/internal/base.hh |
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