| 1 | ///////////////////////////////////////////////////////////////////////////////
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| 2 | // File: siscone.cpp //
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| 3 | // Description: source file for the main SISCone class //
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| 4 | // This file is part of the SISCone project. //
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| 5 | // For more details, see http://projects.hepforge.org/siscone //
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| 6 | // //
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| 7 | // Copyright (c) 2006 Gavin Salam and Gregory Soyez //
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| 8 | // //
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| 9 | // This program is free software; you can redistribute it and/or modify //
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| 10 | // it under the terms of the GNU General Public License as published by //
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| 11 | // the Free Software Foundation; either version 2 of the License, or //
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| 12 | // (at your option) any later version. //
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| 13 | // //
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| 14 | // This program is distributed in the hope that it will be useful, //
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| 15 | // but WITHOUT ANY WARRANTY; without even the implied warranty of //
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| 16 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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| 17 | // GNU General Public License for more details. //
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| 18 | // //
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| 19 | // You should have received a copy of the GNU General Public License //
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| 20 | // along with this program; if not, write to the Free Software //
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| 21 | // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA //
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| 22 | // //
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| 23 | // $Revision:: $//
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| 24 | // $Date:: $//
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| 25 | ///////////////////////////////////////////////////////////////////////////////
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| 26 |
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| 27 | //#ifdef HAVE_CONFIG_H
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| 28 | #include "config.h"
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| 29 | //#else
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| 30 | //#define PACKAGE_NAME "SISCone"
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| 31 | //#define VERSION "2.0.6"
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| 32 | //#warning "No config.h file available, using preset values"
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| 33 | //#endif
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| 34 |
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| 35 | #include "ranlux.h"
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| 36 | #include "momentum.h"
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| 37 | #include "defines.h"
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| 38 | #include "siscone.h"
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| 39 | #include "siscone_error.h"
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| 40 | #include <iostream>
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| 41 | #include <sstream>
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| 42 | #include <iomanip>
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| 43 |
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| 44 | namespace siscone{
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| 45 | using namespace std;
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| 46 |
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| 47 | /***************************************************************
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| 48 | * Csiscone implementation *
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| 49 | * final class: gather everything to compute the jet contents. *
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| 50 | * *
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| 51 | * This is the class user should use. *
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| 52 | * It computes the jet contents of a list of particles *
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| 53 | * given a cone radius and a threshold for splitting/merging. *
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| 54 | ***************************************************************/
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| 55 |
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| 56 | // default ctor
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| 57 | //--------------
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| 58 | Csiscone::Csiscone(){
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| 59 | rerun_allowed = false;
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| 60 | }
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| 61 |
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| 62 | // default dtor
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| 63 | //--------------
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| 64 | Csiscone::~Csiscone(){
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| 65 | rerun_allowed = false;
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| 66 | }
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| 67 |
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| 68 | bool Csiscone::init_done=false;
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| 69 | std::ostream* Csiscone::_banner_ostr = &cout;
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| 70 |
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| 71 | /*
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| 72 | * compute the jets from a given particle set doing multiple passes
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| 73 | * such pass N looks for jets among all particles not put into jets
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| 74 | * during previous passes.
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| 75 | * - _particles list of particles
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| 76 | * - _radius cone radius
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| 77 | * - _f shared energy threshold for splitting&merging
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| 78 | * - _n_pass_max maximum number of runs
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| 79 | * - _ptmin minimum pT of the protojets
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| 80 | * - _split_merge_scale the scale choice for the split-merge procedure
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| 81 | * NOTE: using pt leads to IR unsafety for some events with momentum
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| 82 | * conservation. So we strongly advise not to change the default
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| 83 | * value.
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| 84 | * return the number of jets found.
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| 85 | **********************************************************************/
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| 86 | int Csiscone::compute_jets(vector<Cmomentum> &_particles, double _radius, double _f,
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| 87 | int _n_pass_max, double _ptmin,
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| 88 | Esplit_merge_scale _split_merge_scale){
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| 89 | // initialise random number generator
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| 90 | if (!init_done){
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| 91 | // initialise random number generator
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| 92 | ranlux_init();
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| 93 |
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| 94 | // do not do this again
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| 95 | init_done=true;
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| 96 |
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| 97 | // print the banner
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| 98 | if (_banner_ostr != 0){
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| 99 | (*_banner_ostr) << "#ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo" << endl;
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| 100 | (*_banner_ostr) << "# SISCone version " << setw(28) << left << siscone_version() << "o" << endl;
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| 101 | (*_banner_ostr) << "# http://projects.hepforge.org/siscone o" << endl;
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| 102 | (*_banner_ostr) << "# o" << endl;
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| 103 | (*_banner_ostr) << "# This is SISCone: the Seedless Infrared Safe Cone Jet Algorithm o" << endl;
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| 104 | (*_banner_ostr) << "# SISCone was written by Gavin Salam and Gregory Soyez o" << endl;
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| 105 | (*_banner_ostr) << "# It is released under the terms of the GNU General Public License o" << endl;
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| 106 | (*_banner_ostr) << "# o" << endl;
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| 107 | (*_banner_ostr) << "# A description of the algorithm is available in the publication o" << endl;
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| 108 | (*_banner_ostr) << "# JHEP 05 (2007) 086 [arXiv:0704.0292 (hep-ph)]. o" << endl;
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| 109 | (*_banner_ostr) << "# Please cite it if you use SISCone. o" << endl;
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| 110 | (*_banner_ostr) << "#ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo" << endl;
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| 111 | (*_banner_ostr) << endl;
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| 112 |
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| 113 | _banner_ostr->flush();
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| 114 | }
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| 115 | }
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| 116 |
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| 117 | // run some general safety tests (NB: f will be checked in split-merge)
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| 118 | if (_radius <= 0.0 || _radius >= 0.5*M_PI) {
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| 119 | ostringstream message;
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| 120 | message << "Illegal value for cone radius, R = " << _radius
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| 121 | << " (legal values are 0<R<pi/2)";
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| 122 | throw Csiscone_error(message.str());
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| 123 | }
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| 124 |
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| 125 |
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| 126 |
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| 127 | ptcomparison.split_merge_scale = _split_merge_scale;
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| 128 | partial_clear(); // make sure some things are initialised properly
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| 129 |
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| 130 | // init the split_merge algorithm with the initial list of particles
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| 131 | // this initialises particle list p_left of remaining particles to deal with
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| 132 | init_particles(_particles);
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| 133 |
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| 134 | bool finished = false;
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| 135 |
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| 136 | rerun_allowed = false;
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| 137 | protocones_list.clear();
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| 138 |
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| 139 | #ifdef DEBUG_STABLE_CONES
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| 140 | nb_hash_cones_total = 0;
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| 141 | nb_hash_occupied_total = 0;
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| 142 | #endif
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| 143 |
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| 144 | do{
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| 145 | // initialise stable_cone finder
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| 146 | // here we use the list of remaining particles
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| 147 | // AFTER COLLINEAR CLUSTERING !!!!!!
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| 148 | Cstable_cones::init(p_uncol_hard);
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| 149 |
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| 150 | // get stable cones
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| 151 | if (get_stable_cones(_radius)){
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| 152 | // we have some new protocones; add them to candidates
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| 153 | // Note that add_protocones has to be called first
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| 154 | // if we want the 4-vect components to be available
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| 155 | // on top of eta and phi.
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| 156 | add_protocones(&protocones, R2, _ptmin);
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| 157 | protocones_list.push_back(protocones);
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| 158 | #ifdef DEBUG_STABLE_CONES
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| 159 | nb_hash_cones_total += nb_hash_cones;
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| 160 | nb_hash_occupied_total += nb_hash_occupied;
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| 161 | #endif
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| 162 | } else {
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| 163 | // no new protocone: leave
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| 164 | finished=true;
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| 165 | }
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| 166 |
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| 167 | _n_pass_max--;
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| 168 | } while ((!finished) && (n_left>0) && (_n_pass_max!=0));
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| 169 |
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| 170 | rerun_allowed = true;
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| 171 |
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| 172 | // split & merge
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| 173 | return perform(_f, _ptmin);
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| 174 | }
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| 175 |
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| 176 | /*
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| 177 | * recompute the jets with a different overlap parameter.
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| 178 | * we use the same particles and R as in the preceeding call.
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| 179 | * - _f shared energy threshold for splitting&merging
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| 180 | * - _ptmin minimum pT of the protojets
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| 181 | * - _split_merge_scale the scale choice for the split-merge procedure
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| 182 | * NOTE: using pt leads to IR unsafety for some events with momentum
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| 183 | * conservation. So we strongly advise not to change the default
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| 184 | * value.
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| 185 | * return the number of jets found, -1 if recomputation not allowed.
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| 186 | ********************************************************************/
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| 187 | int Csiscone::recompute_jets(double _f, double _ptmin,
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| 188 | Esplit_merge_scale _split_merge_scale){
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| 189 | if (!rerun_allowed)
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| 190 | return -1;
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| 191 |
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| 192 | ptcomparison.split_merge_scale = _split_merge_scale;
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| 193 |
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| 194 | // restore particle list
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| 195 | partial_clear();
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| 196 | init_pleft();
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| 197 |
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| 198 | // initialise split/merge algorithm
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| 199 | unsigned int i;
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| 200 | for (i=0;i<protocones_list.size();i++)
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| 201 | add_protocones(&(protocones_list[i]), R2, _ptmin);
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| 202 |
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| 203 | // split & merge
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| 204 | return perform(_f, _ptmin);
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| 205 | }
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| 206 |
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| 207 |
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| 208 | // finally, a bunch of functions to access to
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| 209 | // basic information (package name, version)
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| 210 | //---------------------------------------------
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| 211 |
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| 212 | /*
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| 213 | * return SISCone package name.
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| 214 | * This is nothing but "SISCone", it is a replacement to the
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| 215 | * PACKAGE_NAME string defined in config.h and which is not
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| 216 | * public by default.
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| 217 | * return the SISCone name as a string
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| 218 | */
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| 219 | string siscone_package_name(){
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| 220 | return PACKAGE_NAME;
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| 221 | }
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| 222 |
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| 223 | /*
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| 224 | * return SISCone version number.
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| 225 | * return a string of the form "X.Y.Z" with possible additional tag
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| 226 | * (alpha, beta, devel) to mention stability status
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| 227 | */
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| 228 | string siscone_version(){
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| 229 | return VERSION;
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| 230 | }
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| 231 |
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| 232 | }
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