source: HiSusy/trunk/Delphes/Delphes-3.0.9/external/fastjet/plugins/D0RunIICone/D0RunIIConePlugin.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: 6.3 KB
Line 
1//STARTHEADER
2// $Id: D0RunIIConePlugin.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/D0RunIIConePlugin.hh"
30#include "fastjet/ClusterSequence.hh"
31#include "fastjet/Error.hh"
32#include <sstream>
33
34// D0 stuff
35#include <list>
36#include "ILConeAlgorithm.hpp"
37#include "HepEntity.h"
38
39FASTJET_BEGIN_NAMESPACE      // defined in fastjet/internal/base.hh
40
41using namespace std;
42using namespace d0;
43
44const double D0RunIIConePlugin::_DEFAULT_split_ratio              = 0.5  ; // overlap threshold
45const double D0RunIIConePlugin::_DEFAULT_far_ratio                = 0.5  ;
46const double D0RunIIConePlugin::_DEFAULT_Et_min_ratio             = 0.5  ;
47const bool   D0RunIIConePlugin::_DEFAULT_kill_duplicate           = true ;
48const double D0RunIIConePlugin::_DEFAULT_duplicate_dR             = 0.005; 
49const double D0RunIIConePlugin::_DEFAULT_duplicate_dPT            = 0.01 ; 
50const double D0RunIIConePlugin::_DEFAULT_search_factor            = 1.0  ; 
51const double D0RunIIConePlugin::_DEFAULT_pT_min_leading_protojet  = 0.   ; 
52const double D0RunIIConePlugin::_DEFAULT_pT_min_second_protojet   = 0.   ;
53const int    D0RunIIConePlugin::_DEFAULT_merge_max                = 10000; 
54const double D0RunIIConePlugin::_DEFAULT_pT_min_nomerge           = 0.   ;
55
56bool D0RunIIConePlugin::_first_time = true;
57
58string D0RunIIConePlugin::description () const {
59  ostringstream desc;
60 
61  desc << "D0 Run II Improved Legacy (midpoint) cone jet algorithm, with ";
62  desc << "cone_radius = "        << cone_radius        () << ", "
63       << "min_jet_Et = "         << min_jet_Et         () << ", " 
64       << "split_ratio = "        << split_ratio        ();
65
66  return desc.str();
67}
68
69
70void D0RunIIConePlugin::run_clustering(ClusterSequence & clust_seq) const {
71  // print a banner if we run this for the first time
72  _print_banner(clust_seq.fastjet_banner_stream());
73 
74  // create the entities needed by the D0 code
75  vector<HepEntity> entities(clust_seq.jets().size());
76  list<const HepEntity * > ensemble;
77  for (unsigned i = 0; i < clust_seq.jets().size(); i++) {
78    entities[i].Fill(clust_seq.jets()[i].E(),
79                     clust_seq.jets()[i].px(),
80                     clust_seq.jets()[i].py(),
81                     clust_seq.jets()[i].pz(),
82                     i);
83    // use only the particles that do not have infinite rapidity
84    if (abs(entities[i].pz) < entities[i].E) {
85      ensemble.push_back(& (entities[i]));
86    }
87  }
88
89  // prepare the D0 algorithm
90  ILConeAlgorithm<HepEntity> 
91    ilegac(cone_radius(), 
92           min_jet_Et(), 
93           split_ratio(),
94           far_ratio(), 
95           Et_min_ratio(), 
96           kill_duplicate(), 
97           duplicate_dR(), 
98           duplicate_dPT(), 
99           search_factor(), 
100           pT_min_leading_protojet(), 
101           pT_min_second_protojet(), 
102           merge_max(), 
103           pT_min_nomerge());
104
105  // run the algorithm
106  float Item_ET_Threshold = 0.;
107  list<HepEntity> jets;
108  ilegac.makeClusters(jets, ensemble, Item_ET_Threshold);
109
110  // now transfer the information about the jets into the
111  // FastJet structure
112  for(int i = ilegac.ilcv.size()-1; i >= 0; i--) {
113   
114    std::list<const HepEntity*> tlist = ilegac.ilcv[i].LItems();
115    std::list<const HepEntity*>::iterator tk;
116   
117    // get first particle in list
118    tk = tlist.begin();
119
120    // if there is no particle, just discard it
121    // Note: this unexpected behaviour has been observed when the
122    //       min_jet_Et parameter was set to 0
123    if (tk==tlist.end())
124      continue;
125
126    int jet_k = (*tk)->index;
127    // now merge with remaining particles in list
128    tk++;
129    for (; tk != tlist.end(); tk++) {
130      int jet_i = jet_k;
131      int jet_j = (*tk)->index;
132      // do a fake recombination step with dij=0
133      double dij = 0.0;
134      clust_seq.plugin_record_ij_recombination(jet_i, jet_j, dij, jet_k);
135    }
136
137    // NB: put a sensible looking d_iB just to be nice...
138    double d_iB = clust_seq.jets()[jet_k].perp2();
139    clust_seq.plugin_record_iB_recombination(jet_k, d_iB);
140
141  }
142}
143
144// print a banner for reference to the 3rd-party code
145void D0RunIIConePlugin::_print_banner(ostream *ostr) const{
146  if (! _first_time) return;
147  _first_time=false;
148
149  // make sure the user has not set the banner stream to NULL
150  if (!ostr) return; 
151
152  (*ostr) << "#--------------------------------------------------------------------------" << endl;
153  (*ostr) << "# You are running the D0 Run II Cone plugin for FastJet                    " << endl;
154  (*ostr) << "# Original code by the D0 collaboration, provided by Lars Sonnenschein;    " << endl;
155  (*ostr) << "# interface by FastJet authors                                             " << endl;
156  (*ostr) << "# If you use this plugin, please cite                                      " << endl;
157  (*ostr) << "#   G. C. Blazey et al., hep-ex/0005012                                    " << endl;
158  (*ostr) << "#   V. M. Abazov et al. [D0 Collaboration], arXiv:1110.3771 [hep-ex]       " << endl; 
159  (*ostr) << "# in addition to the usual FastJet reference.                              " << endl;
160  (*ostr) << "#--------------------------------------------------------------------------" << endl;
161
162  // make sure we really have the output done.
163  ostr->flush();
164}
165
166FASTJET_END_NAMESPACE      // defined in fastjet/internal/base.hh
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