[1] | 1 | //STARTHEADER |
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| 2 | // $Id: PseudoJetStructureBase.hh 2670 2011-11-11 17:01:06Z salam $ |
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| 3 | // |
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| 4 | // Copyright (c) 2005-2011, Matteo Cacciari, Gavin P. Salam and Gregory Soyez |
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| 5 | // |
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| 6 | //---------------------------------------------------------------------- |
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| 7 | // This file is part of FastJet. |
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| 8 | // |
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| 9 | // FastJet 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 | // The algorithms that underlie FastJet have required considerable |
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| 15 | // development and are described in hep-ph/0512210. If you use |
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| 16 | // FastJet as part of work towards a scientific publication, please |
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| 17 | // include a citation to the FastJet paper. |
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| 18 | // |
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| 19 | // FastJet is distributed in the hope that it will be useful, |
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| 20 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 21 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 22 | // GNU General Public License for more details. |
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| 23 | // |
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| 24 | // You should have received a copy of the GNU General Public License |
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| 25 | // along with FastJet. If not, see <http://www.gnu.org/licenses/>. |
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| 26 | //---------------------------------------------------------------------- |
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| 27 | //ENDHEADER |
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| 28 | |
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| 29 | |
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| 30 | #ifndef __FASTJET_PSEUDOJET_STRUCTURE_BASE_HH__ |
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| 31 | #define __FASTJET_PSEUDOJET_STRUCTURE_BASE_HH__ |
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| 32 | |
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| 33 | #include "fastjet/internal/base.hh" |
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| 34 | |
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| 35 | #include <vector> |
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| 36 | #include <string> |
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| 37 | |
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| 38 | FASTJET_BEGIN_NAMESPACE // defined in fastjet/internal/base.hh |
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| 39 | |
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| 40 | class PseudoJet; |
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| 41 | class ClusterSequence; |
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| 42 | class ClusterSequenceAreaBase; |
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| 43 | |
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| 44 | /// @ingroup extra_info |
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| 45 | /// \class PseudoJetStructureBase |
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| 46 | /// |
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| 47 | /// Contains any information related to the clustering that should be |
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| 48 | /// directly accessible to PseudoJet. |
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| 49 | /// |
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| 50 | /// By default, this class implements basic access to the |
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| 51 | /// ClusterSequence related to a PseudoJet (like its constituents or |
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| 52 | /// its area). But it can be overloaded in order e.g. to give access |
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| 53 | /// to the jet substructure. |
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| 54 | /// |
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| 55 | class PseudoJetStructureBase{ |
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| 56 | public: |
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| 57 | /// default ctor |
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| 58 | PseudoJetStructureBase(){}; |
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| 59 | |
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| 60 | /// default (virtual) dtor |
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| 61 | virtual ~PseudoJetStructureBase(){}; |
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| 62 | |
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| 63 | /// description |
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| 64 | virtual std::string description() const{ return "PseudoJet with an unknown structure"; } |
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| 65 | |
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| 66 | //------------------------------------------------------------- |
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| 67 | /// @name Direct access to the associated ClusterSequence object. |
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| 68 | /// |
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| 69 | /// Get access to the associated ClusterSequence (if any) |
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| 70 | //\{ |
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| 71 | //------------------------------------------------------------- |
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| 72 | /// returns true if there is an associated ClusterSequence |
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| 73 | virtual bool has_associated_cluster_sequence() const { return false;} |
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| 74 | |
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| 75 | /// get a (const) pointer to the parent ClusterSequence (NULL if |
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| 76 | /// inexistent) |
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| 77 | virtual const ClusterSequence* associated_cluster_sequence() const; |
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| 78 | |
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| 79 | /// returns true if this PseudoJet has an associated and still |
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| 80 | /// valid ClusterSequence. |
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| 81 | virtual bool has_valid_cluster_sequence() const {return false;} |
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| 82 | |
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| 83 | /// if the jet has a valid associated cluster sequence then return a |
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| 84 | /// pointer to it; otherwise throw an error |
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| 85 | virtual const ClusterSequence * validated_cs() const; |
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| 86 | |
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| 87 | /// if the jet has valid area information then return a pointer to |
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| 88 | /// the associated ClusterSequenceAreaBase object; otherwise throw an error |
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| 89 | virtual const ClusterSequenceAreaBase * validated_csab() const; |
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| 90 | |
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| 91 | //\} |
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| 92 | |
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| 93 | //------------------------------------------------------------- |
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| 94 | /// @name Methods for access to information about jet structure |
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| 95 | /// |
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| 96 | /// These allow access to jet constituents, and other jet |
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| 97 | /// subtructure information. They only work if the jet is associated |
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| 98 | /// with a ClusterSequence. |
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| 99 | //------------------------------------------------------------- |
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| 100 | //\{ |
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| 101 | |
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| 102 | /// check if it has been recombined with another PseudoJet in which |
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| 103 | /// case, return its partner through the argument. Otherwise, |
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| 104 | /// 'partner' is set to 0. |
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| 105 | /// |
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| 106 | /// By default, throws an Error |
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| 107 | virtual bool has_partner(const PseudoJet &reference, PseudoJet &partner) const; |
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| 108 | |
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| 109 | /// check if it has been recombined with another PseudoJet in which |
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| 110 | /// case, return its child through the argument. Otherwise, 'child' |
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| 111 | /// is set to 0. |
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| 112 | /// |
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| 113 | /// By default, throws an Error |
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| 114 | virtual bool has_child(const PseudoJet &reference, PseudoJet &child) const; |
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| 115 | |
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| 116 | /// check if it is the product of a recombination, in which case |
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| 117 | /// return the 2 parents through the 'parent1' and 'parent2' |
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| 118 | /// arguments. Otherwise, set these to 0. |
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| 119 | /// |
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| 120 | /// By default, throws an Error |
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| 121 | virtual bool has_parents(const PseudoJet &reference, PseudoJet &parent1, PseudoJet &parent2) const; |
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| 122 | |
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| 123 | /// check if the reference PseudoJet is contained the second one |
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| 124 | /// passed as argument. |
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| 125 | /// |
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| 126 | /// By default, throws an Error |
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| 127 | virtual bool object_in_jet(const PseudoJet &reference, const PseudoJet &jet) const; |
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| 128 | |
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| 129 | |
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| 130 | /// return true if the structure supports constituents. |
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| 131 | /// |
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| 132 | /// false by default |
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| 133 | virtual bool has_constituents() const {return false;} |
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| 134 | |
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| 135 | /// retrieve the constituents. |
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| 136 | /// |
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| 137 | /// By default, throws an Error |
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| 138 | virtual std::vector<PseudoJet> constituents(const PseudoJet &reference) const; |
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| 139 | |
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| 140 | |
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| 141 | /// return true if the structure supports exclusive_subjets. |
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| 142 | virtual bool has_exclusive_subjets() const {return false;} |
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| 143 | |
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| 144 | /// return a vector of all subjets of the current jet (in the sense |
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| 145 | /// of the exclusive algorithm) that would be obtained when running |
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| 146 | /// the algorithm with the given dcut. |
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| 147 | /// |
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| 148 | /// Time taken is O(m ln m), where m is the number of subjets that |
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| 149 | /// are found. If m gets to be of order of the total number of |
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| 150 | /// constituents in the jet, this could be substantially slower than |
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| 151 | /// just getting that list of constituents. |
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| 152 | /// |
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| 153 | /// By default, throws an Error |
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| 154 | virtual std::vector<PseudoJet> exclusive_subjets(const PseudoJet &reference, const double & dcut) const; |
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| 155 | |
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| 156 | /// return the size of exclusive_subjets(...); still n ln n with same |
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| 157 | /// coefficient, but marginally more efficient than manually taking |
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| 158 | /// exclusive_subjets.size() |
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| 159 | /// |
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| 160 | /// By default, throws an Error |
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| 161 | virtual int n_exclusive_subjets(const PseudoJet &reference, const double & dcut) const; |
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| 162 | |
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| 163 | /// return the list of subjets obtained by unclustering the supplied |
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| 164 | /// jet down to nsub subjets (or all constituents if there are fewer |
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| 165 | /// than nsub). |
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| 166 | /// |
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| 167 | /// By default, throws an Error |
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| 168 | virtual std::vector<PseudoJet> exclusive_subjets_up_to (const PseudoJet &reference, int nsub) const; |
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| 169 | |
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| 170 | /// return the dij that was present in the merging nsub+1 -> nsub |
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| 171 | /// subjets inside this jet. |
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| 172 | /// |
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| 173 | /// By default, throws an Error |
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| 174 | virtual double exclusive_subdmerge(const PseudoJet &reference, int nsub) const; |
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| 175 | |
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| 176 | /// return the maximum dij that occurred in the whole event at the |
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| 177 | /// stage that the nsub+1 -> nsub merge of subjets occurred inside |
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| 178 | /// this jet. |
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| 179 | /// |
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| 180 | /// By default, throws an Error |
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| 181 | virtual double exclusive_subdmerge_max(const PseudoJet &reference, int nsub) const; |
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| 182 | |
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| 183 | |
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| 184 | //------------------------------------------------------------------- |
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| 185 | // information related to the pieces of the jet |
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| 186 | //------------------------------------------------------------------- |
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| 187 | /// return true if the structure supports pieces. |
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| 188 | /// |
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| 189 | /// false by default |
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| 190 | /// NB: "reference" is commented to avoid unused-variable compiler warnings |
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| 191 | virtual bool has_pieces(const PseudoJet & /* reference */) const { |
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| 192 | return false;} |
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| 193 | |
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| 194 | /// retrieve the pieces building the jet. |
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| 195 | /// |
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| 196 | /// By default, throws an Error. |
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| 197 | /// NB: "reference" is commented to avoid unused-variable compiler warnings |
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| 198 | virtual std::vector<PseudoJet> pieces(const PseudoJet & /* reference */ |
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| 199 | ) const; |
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| 200 | |
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| 201 | |
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| 202 | // the following ones require a computation of the area in the |
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| 203 | // parent ClusterSequence (See ClusterSequenceAreaBase for details) |
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| 204 | //------------------------------------------------------------------ |
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| 205 | |
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| 206 | /// check if it has a defined area |
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| 207 | /// |
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| 208 | /// false by default |
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| 209 | virtual bool has_area() const {return false;} |
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| 210 | |
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| 211 | /// return the jet (scalar) area. |
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| 212 | /// |
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| 213 | /// By default, throws an Error |
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| 214 | virtual double area(const PseudoJet &reference) const; |
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| 215 | |
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| 216 | /// return the error (uncertainty) associated with the determination |
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| 217 | /// of the area of this jet. |
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| 218 | /// |
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| 219 | /// By default, throws an Error |
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| 220 | virtual double area_error(const PseudoJet &reference) const; |
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| 221 | |
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| 222 | /// return the jet 4-vector area. |
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| 223 | /// |
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| 224 | /// By default, throws an Error |
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| 225 | virtual PseudoJet area_4vector(const PseudoJet &reference) const; |
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| 226 | |
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| 227 | /// true if this jet is made exclusively of ghosts. |
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| 228 | /// |
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| 229 | /// By default, throws an Error |
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| 230 | virtual bool is_pure_ghost(const PseudoJet &reference) const; |
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| 231 | |
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| 232 | //\} --- end of jet structure ------------------------------------- |
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| 233 | }; |
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| 234 | |
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| 235 | FASTJET_END_NAMESPACE |
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| 236 | |
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| 237 | #endif // __FASTJET_PSEUDOJET_STRUCTURE_BASE_HH__ |
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