[1] | 1 | // -*- C++ -*- |
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| 2 | /////////////////////////////////////////////////////////////////////////////// |
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| 3 | // File: area.h // |
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| 4 | // Description: header file for the computation of jet area // |
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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 02:49:23 +0100 (Wed, 28 Nov 2012) $// |
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| 26 | /////////////////////////////////////////////////////////////////////////////// |
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| 27 | |
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| 28 | #ifndef __SISCONE_AREA_H__ |
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| 29 | #define __SISCONE_AREA_H__ |
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| 30 | |
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| 31 | #include "momentum.h" |
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| 32 | #include "siscone.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 Cjet_area |
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| 38 | * real Jet information, including its area(s) |
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| 39 | * |
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| 40 | * This class contains information for one single jet. |
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| 41 | * That is, first, its momentum carrying information |
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| 42 | * about its centre and pT, and second, its particle |
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| 43 | * contents. |
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| 44 | * Compared to the Cjet class, it also includes the |
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| 45 | * passive and active areas of the jet computed using |
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| 46 | * the Carea class. |
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| 47 | */ |
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| 48 | class Cjet_area : public Cjet{ |
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| 49 | public: |
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| 50 | /// default ctor |
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| 51 | Cjet_area(); |
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| 52 | |
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| 53 | /// jet-initialised ctor |
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| 54 | Cjet_area(Cjet &j); |
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| 55 | |
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| 56 | /// default dtor |
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| 57 | ~Cjet_area(); |
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| 58 | |
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| 59 | // area information |
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| 60 | double passive_area; ///< passive area |
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| 61 | double active_area; ///< active area |
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| 62 | }; |
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| 63 | |
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| 64 | /** |
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| 65 | * \class Carea |
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| 66 | * class for the computation of jet areas. |
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| 67 | * |
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| 68 | * This is the class user should use whenever you want to compute |
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| 69 | * the jet area (passive and active). . |
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| 70 | * It uses the SISCone algorithm to perform the jet analysis. |
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| 71 | */ |
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| 72 | class Carea : public Csiscone{ |
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| 73 | public: |
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| 74 | /// default ctor |
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| 75 | Carea(); |
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| 76 | |
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| 77 | /// default dtor |
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| 78 | ~Carea(); |
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| 79 | |
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| 80 | /** |
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| 81 | * compute the jet areas from a given particle set. |
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| 82 | * The parameters of this method are the ones which control the jet clustering alghorithn. |
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| 83 | * Note that the pt_min is not allowed here soince the jet-area determination involves soft |
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| 84 | * particles/jets and thus is used internally. |
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| 85 | * \param _particles list of particles |
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| 86 | * \param _radius cone radius |
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| 87 | * \param _f shared energy threshold for splitting&merging |
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| 88 | * \param _n_pass_max maximum number of passes (0=full search, the default) |
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| 89 | * \param _split_merge_scale the scale choice for the split-merge procedure |
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| 90 | * NOTE: SM_pt leads to IR unsafety for some events with momentum conservation. |
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| 91 | * SM_Et is IR safe but not boost invariant and not implemented(!) |
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| 92 | * SM_mt is IR safe for hadronic events, but not for decays of two |
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| 93 | * back-to-back particles of identical mass |
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| 94 | * SM_pttilde |
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| 95 | * is always IR safe, and also boost invariant (default) |
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| 96 | * \param _hard_only when this is set on, only hard jets are computed |
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| 97 | * and not the purely ghosted jets (default: false) |
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| 98 | * \return the number of jets (including pure-ghost ones if they are included) |
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| 99 | */ |
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| 100 | int compute_areas(std::vector<Cmomentum> &_particles, double _radius, double _f, |
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| 101 | int _n_pass_max=0, Esplit_merge_scale _split_merge_scale=SM_pttilde, |
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| 102 | bool _hard_only=false); |
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| 103 | |
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| 104 | /** |
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| 105 | * compute the jet active areas from a given particle set. |
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| 106 | * The parameters of this method are the ones which control the jet clustering alghorithn. |
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| 107 | * Note that the pt_min is not allowed here soince the jet-area determination involves soft |
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| 108 | * particles/jets and thus is used internally. |
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| 109 | * See compute_areas for paramters definition. |
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| 110 | * \return the number of jets (including pure-ghost ones if they are included) |
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| 111 | */ |
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| 112 | int compute_active_areas(std::vector<Cmomentum> &_particles, double _radius, double _f, |
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| 113 | int _n_pass_max=0, Esplit_merge_scale _split_merge_scale=SM_pttilde, |
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| 114 | bool _hard_only=false); |
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| 115 | |
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| 116 | /** |
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| 117 | * compute the jet passive areas from a given particle set. |
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| 118 | * The parameters of this method are the ones which control the jet clustering alghorithn. |
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| 119 | * Note that the pt_min is not allowed here soince the jet-area determination involves soft |
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| 120 | * particles/jets and thus is used internally. |
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| 121 | * See compute_areas for paramters definition. |
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| 122 | */ |
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| 123 | int compute_passive_areas(std::vector<Cmomentum> &_particles, double _radius, double _f, |
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| 124 | int _n_pass_max=0, Esplit_merge_scale _split_merge_scale=SM_pttilde); |
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| 125 | |
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| 126 | int grid_size; ///< size of the grid we add soft particles on (N_soft=(grid_size^2)) |
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| 127 | double grid_eta_max; ///< maximal value of eta we add soft particles on |
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| 128 | double grid_shift; ///< fractional (random) displacement of the points om the grid |
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| 129 | |
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| 130 | double pt_soft; ///< pt of the soft particles added |
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| 131 | double pt_shift; ///< amplitude of the pt random shift |
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| 132 | double pt_soft_min; ///< pt_min used in SM to compute passive areas |
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| 133 | |
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| 134 | /// jets with their areas |
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| 135 | std::vector<Cjet_area> jet_areas; |
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| 136 | }; |
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| 137 | |
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| 138 | } |
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| 139 | #endif |
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