| 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: 1.1 $//
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| 25 | // $Date: 2008-11-06 14:32:11 $//
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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 "../interface/momentum.h"
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| 32 | #include "../interface/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 Csiscone_area
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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 jets together with their areas
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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 jets together with their active areas
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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 | * \return the jets together with their passive areas
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| 123 | */
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| 124 | int compute_passive_areas(std::vector<Cmomentum> &_particles, double _radius, double _f,
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| 125 | int _n_pass_max=0, Esplit_merge_scale _split_merge_scale=SM_pttilde);
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| 126 |
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| 127 | int grid_size; ///< size of the grid we add soft particles on (N_soft=(grid_size^2))
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| 128 | double grid_eta_max; ///< maximal value of eta we add soft particles on
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| 129 | double grid_shift; ///< fractional (random) displacement of the points om the grid
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| 130 |
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| 131 | double pt_soft; ///< pt of the soft particles added
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| 132 | double pt_shift; ///< amplitude of the pt random shift
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| 133 | double pt_soft_min; ///< pt_min used in SM to compute passive areas
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| 134 |
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| 135 | /// jets with their areas
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| 136 | std::vector<Cjet_area> jet_areas;
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| 137 | };
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| 138 |
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| 139 | }
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| 140 | #endif
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