source: HiSusy/trunk/Delphes/Delphes-3.0.9/external/fastjet/plugins/CDFCones/CDFJetCluPlugin.cc @ 5

Last change on this file since 5 was 5, checked in by zerwas, 11 years ago

update to Delphes-3.0.9

File size: 6.9 KB
Line 
1//STARTHEADER
2// $Id: CDFJetCluPlugin.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/CDFJetCluPlugin.hh"
30#include "fastjet/ClusterSequence.hh"
31#include <sstream>
32#include <cassert>
33
34// CDF stuff
35#include "JetCluAlgorithm.hh"
36#include "PhysicsTower.hh"
37#include "Cluster.hh"
38
39FASTJET_BEGIN_NAMESPACE      // defined in fastjet/internal/base.hh
40
41using namespace std;
42using namespace cdf;
43
44bool CDFJetCluPlugin::_first_time = true;
45
46string CDFJetCluPlugin::description () const {
47  ostringstream desc;
48 
49  desc << "CDF JetClu jet algorithm with " 
50       << "seed_threshold = "     << seed_threshold    () << ", "
51       << "cone_radius = "        << cone_radius       () << ", "
52       << "adjacency_cut = "      << adjacency_cut     () << ", " 
53       << "max_iterations = "     << max_iterations    () << ", "
54       << "iratch = "             << iratch            () << ", "
55       << "overlap_threshold = "  << overlap_threshold () ;
56
57  return desc.str();
58}
59
60
61void CDFJetCluPlugin::run_clustering(ClusterSequence & clust_seq) const {
62  // print a banner if we run this for the first time
63  _print_banner(clust_seq.fastjet_banner_stream());
64 
65  // create the physics towers needed by the CDF code
66  vector<PhysicsTower> towers;
67  towers.reserve(clust_seq.jets().size());
68
69  // create a map to identify jets (actually just the input particles)...
70  //map<double,int> jetmap;
71
72  for (unsigned i = 0; i < clust_seq.jets().size(); i++) {
73    PseudoJet particle(clust_seq.jets()[i]);
74    //_insert_unique(particle, jetmap);
75    LorentzVector fourvect(particle.px(), particle.py(),
76                           particle.pz(), particle.E());
77    PhysicsTower tower(fourvect);
78    // add tracking information for later
79    tower.fjindex = i;
80    towers.push_back(tower);
81  }
82
83  // prepare the CDF algorithm
84  JetCluAlgorithm j(seed_threshold(), cone_radius(), adjacency_cut(),
85                    max_iterations(), iratch(), overlap_threshold());
86   
87  // run the CDF algorithm
88  std::vector<Cluster> jets;
89  j.run(towers,jets);
90
91
92  // now transfer the jets back into our own structure -- we will
93  // mimic the cone code with a sequential recombination sequence in
94  // which the jets are built up by adding one particle at a time
95
96  // NB: with g++-4.0, the reverse iterator code gave problems, so switch
97  //     to indices instead
98  //for(vector<Cluster>::const_reverse_iterator jetIter = jets.rbegin();
99  //                                    jetIter != jets.rend(); jetIter++) {
100  //  const vector<PhysicsTower> & tower_list = jetIter->towerList;
101  //  int jet_k = jetmap[tower_list[0].fourVector.E];
102  //
103  //  int ntow = int(jetIter->towerList.size());
104
105  for(int iCDFjets = jets.size()-1; iCDFjets >= 0; iCDFjets--) {
106
107    const vector<PhysicsTower> & tower_list = jets[iCDFjets].towerList;
108    int ntow = int(tower_list.size());
109   
110    // 2008-09-04: sort the towerList (according to fjindex) so as
111    //             to have a consistent order for particles in jet
112    //             (necessary because addition of ultra-soft particles
113    //             sometimes often modifies the order, while maintaining
114    //             the same overall set)
115    vector<int>    jc_indices(ntow);
116    vector<double> fj_indices(ntow); // use double: benefit from existing routine
117    for (int itow = 0; itow < ntow; itow++) {
118      jc_indices[itow] = itow;
119      fj_indices[itow] = tower_list[itow].fjindex;
120    }
121    sort_indices(jc_indices, fj_indices);
122
123    int jet_k = tower_list[jc_indices[0]].fjindex;
124 
125    for (int itow = 1; itow < ntow; itow++) {
126      if (tower_list[jc_indices[itow]].Et() > 1e-50) {
127      }
128      int jet_i = jet_k;
129      // retrieve our index for the jet
130      int jet_j;
131      jet_j = tower_list[jc_indices[itow]].fjindex;
132
133      // safety check
134      assert (jet_j >= 0 && jet_j < int(towers.size()));
135
136      // do a fake recombination step with dij=0
137      double dij = 0.0;
138
139      // JetClu does E-scheme recombination so we can stick with the
140      // simple option
141      clust_seq.plugin_record_ij_recombination(jet_i, jet_j, dij, jet_k);
142
143    }
144 
145    // NB: put a sensible looking d_iB just to be nice...
146    double d_iB = clust_seq.jets()[jet_k].perp2();
147    clust_seq.plugin_record_iB_recombination(jet_k, d_iB);
148  }
149
150
151  // following code is for testing only
152  //cout << endl;
153  //for(vector<Cluster>::const_iterator jetIter = jets.begin();
154  //                                    jetIter != jets.end(); jetIter++) {
155  //  cout << jetIter->fourVector.pt() << " " << jetIter->fourVector.y() << endl;
156  //}
157  //cout << "-----------------------------------------------------\n";
158  //vector<PseudoJet> ourjets(clust_seq.inclusive_jets());
159  //for (vector<PseudoJet>::const_iterator ourjet = ourjets.begin();
160  //     ourjet != ourjets.end(); ourjet++) {
161  //  cout << ourjet->perp() << " " << ourjet->rap() << endl;
162  //}
163  //cout << endl;
164}
165
166
167// print a banner for reference to the 3rd-party code
168void CDFJetCluPlugin::_print_banner(ostream *ostr) const{
169  if (! _first_time) return;
170  _first_time=false;
171
172  // make sure the user has not set the banner stream to NULL
173  if (!ostr) return; 
174
175  (*ostr) << "#-------------------------------------------------------------------------" << endl;
176  (*ostr) << "# You are running the CDF JetClu plugin for FastJet                       " << endl;
177  (*ostr) << "# This is based on an implementation provided by Joey Huston.             " << endl;
178  (*ostr) << "# If you use this plugin, please cite                                     " << endl;
179  (*ostr) << "#   F. Abe et al. [CDF Collaboration], Phys. Rev. D 45 (1992) 1448.       " << endl;
180  (*ostr) << "# in addition to the usual FastJet reference.                             " << endl;
181  (*ostr) << "#-------------------------------------------------------------------------" << endl;
182
183  // make sure we really have the output done.
184  ostr->flush();
185}
186
187FASTJET_END_NAMESPACE      // defined in fastjet/internal/base.hh
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