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source: svn/trunk/external/fastjet/plugins/D0RunIICone/D0RunIIConePlugin.cc@ 1383

Last change on this file since 1383 was 859, checked in by Pavel Demin, 12 years ago

update fastjet to version 3.0.3

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id Revision Date
File size: 6.3 KB
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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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