source: HiSusy/trunk/Delphes-3.0.0/external/fastjet/plugins/CDFCones/CDFMidPointPlugin.cc @ 1

Last change on this file since 1 was 1, checked in by zerwas, 11 years ago

first import of structure, PYTHIA8 and DELPHES

File size: 6.4 KB
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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
39FASTJET_BEGIN_NAMESPACE      // defined in fastjet/internal/base.hh
40
41using namespace std;
42using namespace cdf;
43
44bool CDFMidPointPlugin::_first_time = true;
45
46string 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
87void 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
156void 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
175FASTJET_END_NAMESPACE      // defined in fastjet/internal/base.hh
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