| 1 | //STARTHEADER
|
|---|
| 2 | // $Id: CDFMidPointPlugin.cc 859 2012-11-28 01:49:23Z pavel $
|
|---|
| 3 | //
|
|---|
| 4 | // Copyright (c) 2005-2011, Matteo Cacciari, Gavin P. Salam and Gregory Soyez
|
|---|
| 5 | //
|
|---|
| 6 | //----------------------------------------------------------------------
|
|---|
| 7 | // This file is part of FastJet.
|
|---|
| 8 | //
|
|---|
| 9 | // FastJet is free software; you can redistribute it and/or modify
|
|---|
| 10 | // it under the terms of the GNU General Public License as published by
|
|---|
| 11 | // the Free Software Foundation; either version 2 of the License, or
|
|---|
| 12 | // (at your option) any later version.
|
|---|
| 13 | //
|
|---|
| 14 | // The algorithms that underlie FastJet have required considerable
|
|---|
| 15 | // development and are described in hep-ph/0512210. If you use
|
|---|
| 16 | // FastJet as part of work towards a scientific publication, please
|
|---|
| 17 | // include a citation to the FastJet paper.
|
|---|
| 18 | //
|
|---|
| 19 | // FastJet is distributed in the hope that it will be useful,
|
|---|
| 20 | // but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|---|
| 21 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|---|
| 22 | // GNU General Public License for more details.
|
|---|
| 23 | //
|
|---|
| 24 | // You should have received a copy of the GNU General Public License
|
|---|
| 25 | // along with FastJet. If not, see <http://www.gnu.org/licenses/>.
|
|---|
| 26 | //----------------------------------------------------------------------
|
|---|
| 27 | //ENDHEADER
|
|---|
| 28 |
|
|---|
| 29 | #include "fastjet/CDFMidPointPlugin.hh"
|
|---|
| 30 | #include "fastjet/ClusterSequence.hh"
|
|---|
| 31 | #include "fastjet/Error.hh"
|
|---|
| 32 | #include <sstream>
|
|---|
| 33 |
|
|---|
| 34 | // CDF stuff
|
|---|
| 35 | #include "MidPointAlgorithm.hh"
|
|---|
| 36 | #include "PhysicsTower.hh"
|
|---|
| 37 | #include "Cluster.hh"
|
|---|
| 38 |
|
|---|
| 39 | FASTJET_BEGIN_NAMESPACE // defined in fastjet/internal/base.hh
|
|---|
| 40 |
|
|---|
| 41 | using namespace std;
|
|---|
| 42 | using namespace cdf;
|
|---|
| 43 |
|
|---|
| 44 | bool CDFMidPointPlugin::_first_time = true;
|
|---|
| 45 |
|
|---|
| 46 | string CDFMidPointPlugin::description () const {
|
|---|
| 47 | ostringstream desc;
|
|---|
| 48 |
|
|---|
| 49 | string sm_scale_string = "split-merge uses ";
|
|---|
| 50 | switch(_sm_scale) {
|
|---|
| 51 | case SM_pt:
|
|---|
| 52 | sm_scale_string += "pt";
|
|---|
| 53 | break;
|
|---|
| 54 | case SM_Et:
|
|---|
| 55 | sm_scale_string += "Et";
|
|---|
| 56 | break;
|
|---|
| 57 | case SM_mt:
|
|---|
| 58 | sm_scale_string += "mt";
|
|---|
| 59 | break;
|
|---|
| 60 | case SM_pttilde:
|
|---|
| 61 | sm_scale_string += "pttilde (scalar sum of pts)";
|
|---|
| 62 | break;
|
|---|
| 63 | default:
|
|---|
| 64 | ostringstream err;
|
|---|
| 65 | err << "Unrecognized split-merge scale choice = " << _sm_scale;
|
|---|
| 66 | throw Error(err.str());
|
|---|
| 67 | }
|
|---|
| 68 |
|
|---|
| 69 |
|
|---|
| 70 | if (cone_area_fraction() == 1) {
|
|---|
| 71 | desc << "CDF MidPoint jet algorithm, with " ;
|
|---|
| 72 | } else {
|
|---|
| 73 | desc << "CDF MidPoint+Searchcone jet algorithm, with ";
|
|---|
| 74 | }
|
|---|
| 75 | desc << "seed_threshold = " << seed_threshold () << ", "
|
|---|
| 76 | << "cone_radius = " << cone_radius () << ", "
|
|---|
| 77 | << "cone_area_fraction = " << cone_area_fraction () << ", "
|
|---|
| 78 | << "max_pair_size = " << max_pair_size () << ", "
|
|---|
| 79 | << "max_iterations = " << max_iterations () << ", "
|
|---|
| 80 | << "overlap_threshold = " << overlap_threshold () << ", "
|
|---|
| 81 | << sm_scale_string ;
|
|---|
| 82 |
|
|---|
| 83 | return desc.str();
|
|---|
| 84 | }
|
|---|
| 85 |
|
|---|
| 86 |
|
|---|
| 87 | void CDFMidPointPlugin::run_clustering(ClusterSequence & clust_seq) const {
|
|---|
| 88 | // print a banner if we run this for the first time
|
|---|
| 89 | _print_banner(clust_seq.fastjet_banner_stream());
|
|---|
| 90 |
|
|---|
| 91 | // create the physics towers needed by the CDF code
|
|---|
| 92 | vector<PhysicsTower> towers;
|
|---|
| 93 | towers.reserve(clust_seq.jets().size());
|
|---|
| 94 | for (unsigned i = 0; i < clust_seq.jets().size(); i++) {
|
|---|
| 95 | LorentzVector fourvect(clust_seq.jets()[i].px(),
|
|---|
| 96 | clust_seq.jets()[i].py(),
|
|---|
| 97 | clust_seq.jets()[i].pz(),
|
|---|
| 98 | clust_seq.jets()[i].E());
|
|---|
| 99 | PhysicsTower tower(fourvect);
|
|---|
| 100 | // misuse one of the indices for tracking, since the MidPoint
|
|---|
| 101 | // implementation doesn't seem to make use of these indices
|
|---|
| 102 | tower.calTower.iEta = i;
|
|---|
| 103 | towers.push_back(tower);
|
|---|
| 104 | }
|
|---|
| 105 |
|
|---|
| 106 | // prepare the CDF algorithm
|
|---|
| 107 | MidPointAlgorithm m(_seed_threshold,_cone_radius,_cone_area_fraction,
|
|---|
| 108 | _max_pair_size,_max_iterations,_overlap_threshold,
|
|---|
| 109 | MidPointAlgorithm::SplitMergeScale(_sm_scale));
|
|---|
| 110 |
|
|---|
| 111 | // run the CDF algorithm
|
|---|
| 112 | std::vector<Cluster> jets;
|
|---|
| 113 | m.run(towers,jets);
|
|---|
| 114 |
|
|---|
| 115 |
|
|---|
| 116 | // now transfer the jets back into our own structure -- we will
|
|---|
| 117 | // mimic the cone code with a sequential recombination sequence in
|
|---|
| 118 | // which the jets are built up by adding one particle at a time
|
|---|
| 119 | for(vector<Cluster>::const_iterator jetIter = jets.begin();
|
|---|
| 120 | jetIter != jets.end(); jetIter++) {
|
|---|
| 121 | const vector<PhysicsTower> & tower_list = jetIter->towerList;
|
|---|
| 122 | int jet_k = tower_list[0].calTower.iEta;
|
|---|
| 123 |
|
|---|
| 124 | int ntow = int(jetIter->towerList.size());
|
|---|
| 125 | for (int itow = 1; itow < ntow; itow++) {
|
|---|
| 126 | int jet_i = jet_k;
|
|---|
| 127 | // retrieve our misappropriated index for the jet
|
|---|
| 128 | int jet_j = tower_list[itow].calTower.iEta;
|
|---|
| 129 | // do a fake recombination step with dij=0
|
|---|
| 130 | double dij = 0.0;
|
|---|
| 131 | clust_seq.plugin_record_ij_recombination(jet_i, jet_j, dij, jet_k);
|
|---|
| 132 | }
|
|---|
| 133 |
|
|---|
| 134 | // NB: put a sensible looking d_iB just to be nice...
|
|---|
| 135 | double d_iB = clust_seq.jets()[jet_k].perp2();
|
|---|
| 136 | clust_seq.plugin_record_iB_recombination(jet_k, d_iB);
|
|---|
| 137 | }
|
|---|
| 138 |
|
|---|
| 139 |
|
|---|
| 140 | // following code is for testing only
|
|---|
| 141 | //cout << endl;
|
|---|
| 142 | //for(vector<Cluster>::const_iterator jetIter = jets.begin();
|
|---|
| 143 | // jetIter != jets.end(); jetIter++) {
|
|---|
| 144 | // cout << jetIter->fourVector.pt() << " " << jetIter->fourVector.y() << endl;
|
|---|
| 145 | //}
|
|---|
| 146 | //cout << "-----------------------------------------------------\n";
|
|---|
| 147 | //vector<PseudoJet> ourjets(clust_seq.inclusive_jets());
|
|---|
| 148 | //for (vector<PseudoJet>::const_reverse_iterator ourjet = ourjets.rbegin();
|
|---|
| 149 | // ourjet != ourjets.rend(); ourjet++) {
|
|---|
| 150 | // cout << ourjet->perp() << " " << ourjet->rap() << endl;
|
|---|
| 151 | //}
|
|---|
| 152 | //cout << endl;
|
|---|
| 153 | }
|
|---|
| 154 |
|
|---|
| 155 | // print a banner for reference to the 3rd-party code
|
|---|
| 156 | void CDFMidPointPlugin::_print_banner(ostream *ostr) const{
|
|---|
| 157 | if (! _first_time) return;
|
|---|
| 158 | _first_time=false;
|
|---|
| 159 |
|
|---|
| 160 | // make sure the user has not set the banner stream to NULL
|
|---|
| 161 | if (!ostr) return;
|
|---|
| 162 |
|
|---|
| 163 | (*ostr) << "#-------------------------------------------------------------------------" << endl;
|
|---|
| 164 | (*ostr) << "# You are running the CDF MidPoint plugin for FastJet " << endl;
|
|---|
| 165 | (*ostr) << "# This is based on an implementation provided by Joey Huston. " << endl;
|
|---|
| 166 | (*ostr) << "# If you use this plugin, please cite " << endl;
|
|---|
| 167 | (*ostr) << "# G. C. Blazey et al., hep-ex/0005012. " << endl;
|
|---|
| 168 | (*ostr) << "# in addition to the usual FastJet reference. " << endl;
|
|---|
| 169 | (*ostr) << "#-------------------------------------------------------------------------" << endl;
|
|---|
| 170 |
|
|---|
| 171 | // make sure we really have the output done.
|
|---|
| 172 | ostr->flush();
|
|---|
| 173 | }
|
|---|
| 174 |
|
|---|
| 175 | FASTJET_END_NAMESPACE // defined in fastjet/internal/base.hh
|
|---|
