FastJet 3.0.2
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00001 //STARTHEADER 00002 // $Id: ClusterSequencePassiveArea.cc 2687 2011-11-14 11:17:51Z soyez $ 00003 // 00004 // Copyright (c) 2005-2011, Matteo Cacciari, Gavin P. Salam and Gregory Soyez 00005 // 00006 //---------------------------------------------------------------------- 00007 // This file is part of FastJet. 00008 // 00009 // FastJet is free software; you can redistribute it and/or modify 00010 // it under the terms of the GNU General Public License as published by 00011 // the Free Software Foundation; either version 2 of the License, or 00012 // (at your option) any later version. 00013 // 00014 // The algorithms that underlie FastJet have required considerable 00015 // development and are described in hep-ph/0512210. If you use 00016 // FastJet as part of work towards a scientific publication, please 00017 // include a citation to the FastJet paper. 00018 // 00019 // FastJet is distributed in the hope that it will be useful, 00020 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00021 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00022 // GNU General Public License for more details. 00023 // 00024 // You should have received a copy of the GNU General Public License 00025 // along with FastJet. If not, see <http://www.gnu.org/licenses/>. 00026 //---------------------------------------------------------------------- 00027 //ENDHEADER 00028 00029 #include "fastjet/ClusterSequencePassiveArea.hh" 00030 #include "fastjet/ClusterSequenceVoronoiArea.hh" 00031 00032 FASTJET_BEGIN_NAMESPACE // defined in fastjet/internal/base.hh 00033 00034 00035 using namespace std; 00036 00037 //---------------------------------------------------------------------- 00038 /// global routine for initialising and running a passive area that is 00039 /// correct in general, but that chooses an optimal approach for 00040 /// various special cases. 00041 void ClusterSequencePassiveArea::_initialise_and_run_PA ( 00042 const JetDefinition & jet_def_in, 00043 const GhostedAreaSpec & area_spec, 00044 const bool & writeout_combinations) { 00045 00046 if (jet_def_in.jet_algorithm() == kt_algorithm) { 00047 // first run the passive area 00048 ClusterSequenceVoronoiArea csva(_jets,jet_def_in,VoronoiAreaSpec(1.0)); 00049 // now set up and transfer relevant information 00050 // first the clustering sequence 00051 transfer_from_sequence(csva); 00052 // then the areas 00053 _resize_and_zero_AA(); 00054 for (unsigned i = 0; i < _history.size(); i++) { 00055 int ijetp = _history[i].jetp_index; 00056 if (ijetp != Invalid) { 00057 _average_area[i] = csva.area(_jets[ijetp]); 00058 _average_area_4vector[i] = csva.area_4vector(_jets[ijetp]); 00059 } 00060 } 00061 00062 } else if (jet_def_in.jet_algorithm() == cambridge_algorithm) { 00063 // run a variant of the cambridge algorithm that has been hacked 00064 // to deal with passive areas 00065 JetDefinition tmp_jet_def = jet_def_in; 00066 tmp_jet_def.set_jet_finder(cambridge_for_passive_algorithm); 00067 tmp_jet_def.set_extra_param(sqrt(area_spec.mean_ghost_kt())); 00068 _initialise_and_run_AA(tmp_jet_def, area_spec, writeout_combinations); 00069 _jet_def = jet_def_in; 00070 00071 } else if (jet_def_in.jet_algorithm() == antikt_algorithm) { 00072 // for the antikt algorithm, passive and active are identical 00073 _initialise_and_run_AA(jet_def_in, area_spec, writeout_combinations); 00074 00075 } else if (jet_def_in.jet_algorithm() == plugin_algorithm && 00076 jet_def_in.plugin()->supports_ghosted_passive_areas()) { 00077 // for some plugin algorithms, one can "prime" the algorithm with information 00078 // about the ghost scale, and then an "AA" run will actually give a passive 00079 // area 00080 double ghost_sep_scale_store = jet_def_in.plugin()->ghost_separation_scale(); 00081 jet_def_in.plugin()->set_ghost_separation_scale(sqrt(area_spec.mean_ghost_kt())); 00082 _initialise_and_run_AA(jet_def_in, area_spec, writeout_combinations); 00083 00084 // restore the original ghost_sep_scale 00085 jet_def_in.plugin()->set_ghost_separation_scale(ghost_sep_scale_store); 00086 00087 } else { 00088 // for a generic algorithm, just run the 1GhostPassiveArea 00089 _initialise_and_run_1GPA(jet_def_in, area_spec, writeout_combinations); 00090 } 00091 } 00092 00093 //---------------------------------------------------------------------- 00094 // dispatch to most relevant empty area calculation... 00095 double ClusterSequencePassiveArea::empty_area (const Selector & selector) const { 00096 if (jet_def().jet_algorithm() == kt_algorithm) { 00097 // run the naive algorithm 00098 return ClusterSequenceAreaBase::empty_area(selector); 00099 } else { 00100 return ClusterSequence1GhostPassiveArea::empty_area(selector); 00101 } 00102 } 00103 00104 00105 FASTJET_END_NAMESPACE // defined in fastjet/internal/base.hh 00106