| 1 | //FJSTARTHEADER
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| 2 | // $Id: CDFMidPointPlugin.cc 4442 2020-05-05 07:50:11Z soyez $
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| 3 | //
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| 4 | // Copyright (c) 2005-2020, 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. They are described in the original FastJet paper,
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| 16 | // hep-ph/0512210 and in the manual, arXiv:1111.6097. If you use
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| 17 | // FastJet as part of work towards a scientific publication, please
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| 18 | // quote the version you use and include a citation to the manual and
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| 19 | // optionally also to hep-ph/0512210.
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| 20 | //
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| 21 | // FastJet is distributed in the hope that it will be useful,
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| 22 | // but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 23 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 24 | // GNU General Public License for more details.
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| 25 | //
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| 26 | // You should have received a copy of the GNU General Public License
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| 27 | // along with FastJet. If not, see <http://www.gnu.org/licenses/>.
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| 28 | //----------------------------------------------------------------------
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| 29 | //FJENDHEADER
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| 30 |
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| 31 | #include "fastjet/CDFMidPointPlugin.hh"
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| 32 | #include "fastjet/ClusterSequence.hh"
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| 33 | #include "fastjet/Error.hh"
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| 34 | #include <sstream>
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| 35 |
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| 36 | // CDF stuff
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| 37 | #include "MidPointAlgorithm.hh"
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| 38 | #include "PhysicsTower.hh"
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| 39 | #include "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 | using namespace cdf;
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| 45 |
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| 46 | bool CDFMidPointPlugin::_first_time = true;
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| 47 |
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| 48 | string CDFMidPointPlugin::description () const {
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| 49 | ostringstream desc;
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| 50 |
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| 51 | string sm_scale_string = "split-merge uses ";
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| 52 | switch(_sm_scale) {
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| 53 | case SM_pt:
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| 54 | sm_scale_string += "pt";
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| 55 | break;
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| 56 | case SM_Et:
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| 57 | sm_scale_string += "Et";
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| 58 | break;
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| 59 | case SM_mt:
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| 60 | sm_scale_string += "mt";
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| 61 | break;
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| 62 | case SM_pttilde:
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| 63 | sm_scale_string += "pttilde (scalar sum of pts)";
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| 64 | break;
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| 65 | default:
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| 66 | ostringstream err;
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| 67 | err << "Unrecognized split-merge scale choice = " << _sm_scale;
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| 68 | throw Error(err.str());
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| 69 | }
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| 70 |
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| 71 |
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| 72 | if (cone_area_fraction() == 1) {
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| 73 | desc << "CDF MidPoint jet algorithm, with " ;
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| 74 | } else {
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| 75 | desc << "CDF MidPoint+Searchcone jet algorithm, with ";
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| 76 | }
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| 77 | desc << "seed_threshold = " << seed_threshold () << ", "
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| 78 | << "cone_radius = " << cone_radius () << ", "
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| 79 | << "cone_area_fraction = " << cone_area_fraction () << ", "
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| 80 | << "max_pair_size = " << max_pair_size () << ", "
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| 81 | << "max_iterations = " << max_iterations () << ", "
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| 82 | << "overlap_threshold = " << overlap_threshold () << ", "
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| 83 | << sm_scale_string ;
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| 84 |
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| 85 | return desc.str();
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| 86 | }
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| 87 |
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| 88 |
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| 89 | void CDFMidPointPlugin::run_clustering(ClusterSequence & clust_seq) const {
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| 90 | // print a banner if we run this for the first time
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| 91 | _print_banner(clust_seq.fastjet_banner_stream());
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| 92 |
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| 93 | // create the physics towers needed by the CDF code
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| 94 | vector<PhysicsTower> towers;
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| 95 | towers.reserve(clust_seq.jets().size());
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| 96 | for (unsigned i = 0; i < clust_seq.jets().size(); i++) {
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| 97 | LorentzVector fourvect(clust_seq.jets()[i].px(),
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| 98 | clust_seq.jets()[i].py(),
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| 99 | clust_seq.jets()[i].pz(),
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| 100 | clust_seq.jets()[i].E());
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| 101 | PhysicsTower tower(fourvect);
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| 102 | // misuse one of the indices for tracking, since the MidPoint
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| 103 | // implementation doesn't seem to make use of these indices
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| 104 | tower.calTower.iEta = i;
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| 105 | towers.push_back(tower);
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| 106 | }
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| 107 |
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| 108 | // prepare the CDF algorithm
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| 109 | MidPointAlgorithm m(_seed_threshold,_cone_radius,_cone_area_fraction,
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| 110 | _max_pair_size,_max_iterations,_overlap_threshold,
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| 111 | MidPointAlgorithm::SplitMergeScale(_sm_scale));
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| 112 |
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| 113 | // run the CDF algorithm
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| 114 | std::vector<Cluster> jets;
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| 115 | m.run(towers,jets);
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| 116 |
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| 117 |
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| 118 | // now transfer the jets back into our own structure -- we will
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| 119 | // mimic the cone code with a sequential recombination sequence in
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| 120 | // which the jets are built up by adding one particle at a time
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| 121 | for(vector<Cluster>::const_iterator jetIter = jets.begin();
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| 122 | jetIter != jets.end(); jetIter++) {
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| 123 | const vector<PhysicsTower> & tower_list = jetIter->towerList;
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| 124 | int jet_k = tower_list[0].calTower.iEta;
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| 125 |
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| 126 | int ntow = int(jetIter->towerList.size());
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| 127 | for (int itow = 1; itow < ntow; itow++) {
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| 128 | int jet_i = jet_k;
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| 129 | // retrieve our misappropriated index for the jet
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| 130 | int jet_j = tower_list[itow].calTower.iEta;
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| 131 | // do a fake recombination step with dij=0
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| 132 | double dij = 0.0;
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| 133 | clust_seq.plugin_record_ij_recombination(jet_i, jet_j, dij, jet_k);
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| 134 | }
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| 135 |
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| 136 | // NB: put a sensible looking d_iB just to be nice...
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| 137 | double d_iB = clust_seq.jets()[jet_k].perp2();
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| 138 | clust_seq.plugin_record_iB_recombination(jet_k, d_iB);
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| 139 | }
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| 140 |
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| 141 |
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| 142 | // following code is for testing only
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| 143 | //cout << endl;
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| 144 | //for(vector<Cluster>::const_iterator jetIter = jets.begin();
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| 145 | // jetIter != jets.end(); jetIter++) {
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| 146 | // cout << jetIter->fourVector.pt() << " " << jetIter->fourVector.y() << endl;
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| 147 | //}
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| 148 | //cout << "-----------------------------------------------------\n";
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| 149 | //vector<PseudoJet> ourjets(clust_seq.inclusive_jets());
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| 150 | //for (vector<PseudoJet>::const_reverse_iterator ourjet = ourjets.rbegin();
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| 151 | // ourjet != ourjets.rend(); ourjet++) {
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| 152 | // cout << ourjet->perp() << " " << ourjet->rap() << endl;
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| 153 | //}
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| 154 | //cout << endl;
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| 155 | }
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| 156 |
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| 157 | // print a banner for reference to the 3rd-party code
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| 158 | void CDFMidPointPlugin::_print_banner(ostream *ostr) const{
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| 159 | if (! _first_time) return;
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| 160 | _first_time=false;
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| 161 |
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| 162 | // make sure the user has not set the banner stream to NULL
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| 163 | if (!ostr) return;
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| 164 |
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| 165 | (*ostr) << "#-------------------------------------------------------------------------" << endl;
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| 166 | (*ostr) << "# You are running the CDF MidPoint plugin for FastJet " << endl;
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| 167 | (*ostr) << "# This is based on an implementation provided by Joey Huston. " << endl;
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| 168 | (*ostr) << "# If you use this plugin, please cite " << endl;
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| 169 | (*ostr) << "# G. C. Blazey et al., hep-ex/0005012. " << endl;
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| 170 | (*ostr) << "# in addition to the usual FastJet reference. " << endl;
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| 171 | (*ostr) << "#-------------------------------------------------------------------------" << endl;
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| 172 |
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| 173 | // make sure we really have the output done.
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| 174 | ostr->flush();
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| 175 | }
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| 176 |
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| 177 | FASTJET_END_NAMESPACE // defined in fastjet/internal/base.hh
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