| 1 | // -*- C++ -*-
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| 2 | ///////////////////////////////////////////////////////////////////////////////
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| 3 | // File: siscone.h //
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| 4 | // Description: header file for the main SISCone class //
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| 5 | // This file is part of the SISCone project. //
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| 6 | // For more details, see http://projects.hepforge.org/siscone //
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| 7 | // //
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| 8 | // Copyright (c) 2006 Gavin Salam and Gregory Soyez //
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| 9 | // //
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| 10 | // This program is free software; you can redistribute it and/or modify //
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| 11 | // it under the terms of the GNU General Public License as published by //
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| 12 | // the Free Software Foundation; either version 2 of the License, or //
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| 13 | // (at your option) any later version. //
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| 14 | // //
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| 15 | // This program is distributed in the hope that it will be useful, //
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| 16 | // but WITHOUT ANY WARRANTY; without even the implied warranty of //
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| 17 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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| 18 | // GNU General Public License for more details. //
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| 19 | // //
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| 20 | // You should have received a copy of the GNU General Public License //
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| 21 | // along with this program; if not, write to the Free Software //
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| 22 | // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA //
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| 23 | // //
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| 24 | // $Revision:: 859 $//
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| 25 | // $Date:: 2012-11-28 01:49:23 +0000 (Wed, 28 Nov 2012) $//
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| 26 | ///////////////////////////////////////////////////////////////////////////////
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| 27 |
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| 28 | #ifndef __SISCONE_H__
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| 29 | #define __SISCONE_H__
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| 30 |
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| 31 | #include "protocones.h"
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| 32 | #include "split_merge.h"
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| 33 |
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| 34 | namespace siscone{
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| 35 |
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| 36 | /**
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| 37 | * \class Csiscone
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| 38 | * final class: gather everything to compute the jet contents.
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| 39 | *
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| 40 | * This is the class user should use.
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| 41 | * It computes the jet contents of a list of particles
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| 42 | * given a cone radius and a threshold for splitting/merging.
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| 43 | *
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| 44 | * After the call to 'perform', the vector jets is filled with
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| 45 | * the jets found. the 'contents' field of each jets contains
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| 46 | * the indices of the particles included in that jet.
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| 47 | */
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| 48 | class Csiscone : public Cstable_cones, public Csplit_merge{
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| 49 | public:
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| 50 | /// default ctor
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| 51 | Csiscone();
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| 52 |
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| 53 | /// default dtor
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| 54 | ~Csiscone();
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| 55 |
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| 56 | /**
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| 57 | * compute the jets from a given particle set.
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| 58 | * We are doing multiple passes such pass n_pass looks for jets among
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| 59 | * all particles not put into jets during previous passes.
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| 60 | * By default the number of passes is infinite (0).
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| 61 | * \param _particles list of particles
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| 62 | * \param _radius cone radius
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| 63 | * \param _f shared energy threshold for splitting&merging
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| 64 | * \param _n_pass_max maximum number of passes (0=full search)
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| 65 | * \param _ptmin minimum pT of the protojets
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| 66 | * \param _split_merge_scale the scale choice for the split-merge procedure
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| 67 | * NOTE: SM_pt leads to IR unsafety for some events with momentum conservation.
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| 68 | * SM_Et is IR safe but not boost invariant and not implemented(!)
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| 69 | * SM_mt is IR safe for hadronic events, but not for decays of two
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| 70 | * back-to-back particles of identical mass
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| 71 | * SM_pttilde
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| 72 | * is always IR safe, and also boost invariant (default)
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| 73 | *
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| 74 | * \return the number of jets found.
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| 75 | */
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| 76 | int compute_jets(std::vector<Cmomentum> &_particles, double _radius, double _f,
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| 77 | int _n_pass_max=0, double _ptmin=0.0,
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| 78 | Esplit_merge_scale _split_merge_scale=SM_pttilde);
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| 79 |
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| 80 | /**
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| 81 | * recompute the jets with a different overlap parameter.
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| 82 | * we use the same particles and R as in the preceeding call.
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| 83 | * \param _f shared energy threshold for splitting&merging
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| 84 | * \param _ptmin minimum pT of the protojets
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| 85 | * \param _split_merge_scale the scale choice for the split-merge procedure
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| 86 | * split--merge variable
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| 87 | * NOTE: using pt leads to IR unsafety for some events with momentum
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| 88 | * conservation. So we strongly advise not to change the default
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| 89 | * value.
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| 90 | * \return the number of jets found, -1 if recomputation not allowed.
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| 91 | */
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| 92 | int recompute_jets(double _f, double _ptmin = 0.0,
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| 93 | Esplit_merge_scale _split_merge_scale=SM_pttilde);
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| 94 |
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| 95 | /// list of protocones found pass-by-pass
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| 96 | std::vector<std::vector<Cmomentum> > protocones_list;
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| 97 |
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| 98 | // random number initialisation
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| 99 | static bool init_done; ///< check random generator initialisation
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| 100 |
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| 101 | #ifdef DEBUG_STABLE_CONES
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| 102 | int nb_hash_cones_total, nb_hash_occupied_total;
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| 103 | #endif
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| 104 |
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| 105 | /**
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| 106 | * A call to this function modifies the stream
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| 107 | * used to print banners (by default cout).
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| 108 | *
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| 109 | * Please note that if you distribute 3rd party code
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| 110 | * that links with SISCone, that 3rd party code must not
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| 111 | * use this call turn off the printing of thw banner
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| 112 | * by default. This requirement reflects the spirit of
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| 113 | * clause 2c of the GNU Public License (v2), under which
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| 114 | * SISCone is distributed.
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| 115 | */
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| 116 | static void set_banner_stream(std::ostream * ostr) {_banner_ostr = ostr;}
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| 117 |
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| 118 | /**
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| 119 | * returns a pointer to the stream to be used to print banners
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| 120 | * (cout by default)
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| 121 | */
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| 122 | static std::ostream * banner_stream() {return _banner_ostr;}
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| 123 |
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| 124 | private:
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| 125 | bool rerun_allowed; ///< is recompute_jets allowed ?
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| 126 | static std::ostream * _banner_ostr; ///< stream to use for banners
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| 127 | };
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| 128 |
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| 129 |
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| 130 | // finally, a bunch of functions to access to
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| 131 | // basic information (package name, version)
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| 132 | //---------------------------------------------
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| 133 |
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| 134 | /**
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| 135 | * return SISCone package name.
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| 136 | * This is nothing but "SISCone", it is a replacement to the
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| 137 | * PACKAGE_NAME string defined in config.h and which is not
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| 138 | * public by default.
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| 139 | * \return the SISCone name as a string
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| 140 | */
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| 141 | std::string siscone_package_name();
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| 142 |
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| 143 | /**
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| 144 | * return SISCone version number.
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| 145 | * \return a string of the form "X.Y.Z" with possible additional tag
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| 146 | * (alpha, beta, devel) to mention stability status
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| 147 | */
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| 148 | std::string siscone_version();
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| 149 |
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| 150 | }
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| 151 | #endif
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