2 ///////////////////////////////////////////////////////////////////////////////
4 // Description: header file for the main SISCone class //
5 // This file is part of the SISCone project. //
6 // For more details, see http://projects.hepforge.org/siscone //
8 // Copyright (c) 2006 Gavin Salam and Gregory Soyez //
10 // This program is free software; you can redistribute it and/or modify //
11 // it under the terms of the GNU General Public License as published by //
12 // the Free Software Foundation; either version 2 of the License, or //
13 // (at your option) any later version. //
15 // This program is distributed in the hope that it will be useful, //
16 // but WITHOUT ANY WARRANTY; without even the implied warranty of //
17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
18 // GNU General Public License for more details. //
20 // You should have received a copy of the GNU General Public License //
21 // along with this program; if not, write to the Free Software //
22 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA //
24 // $Revision:: 224 $//
25 // $Date:: 2008-05-16 19:58:30 +0200 (Fri, 16 May 2008) $//
26 ///////////////////////////////////////////////////////////////////////////////
31 #include "protocones.h"
32 #include "split_merge.h"
38 * final class: gather everything to compute the jet contents.
40 * This is the class user should use.
41 * It computes the jet contents of a list of particles
42 * given a cone radius and a threshold for splitting/merging.
44 * After the call to 'perform', the vector jets is filled with
45 * the jets found. the 'contents' field of each jets contains
46 * the indices of the particles included in that jet.
48 class Csiscone : public Cstable_cones, public Csplit_merge{
57 * compute the jets from a given particle set.
58 * We are doing multiple passes such pass n_pass looks for jets among
59 * all particles not put into jets during previous passes.
60 * By default the number of passes is infinite (0).
61 * \param _particles list of particles
62 * \param _radius cone radius
63 * \param _f shared energy threshold for splitting&merging
64 * \param _n_pass_max maximum number of passes (0=full search)
65 * \param _ptmin minimum pT of the protojets
66 * \param _split_merge_scale the scale choice for the split-merge procedure
67 * NOTE: SM_pt leads to IR unsafety for some events with momentum conservation.
68 * SM_Et is IR safe but not boost invariant and not implemented(!)
69 * SM_mt is IR safe for hadronic events, but not for decays of two
70 * back-to-back particles of identical mass
72 * is always IR safe, and also boost invariant (default)
74 * \return the number of jets found.
76 int compute_jets(std::vector<Cmomentum> &_particles, double _radius, double _f,
77 int _n_pass_max=0, double _ptmin=0.0,
78 Esplit_merge_scale _split_merge_scale=SM_pttilde);
81 * recompute the jets with a different overlap parameter.
82 * we use the same particles and R as in the preceeding call.
83 * \param _f shared energy threshold for splitting&merging
84 * \param _ptmin minimum pT of the protojets
85 * \param _split_merge_scale the scale choice for the split-merge procedure
86 * split--merge variable
87 * NOTE: using pt leads to IR unsafety for some events with momentum
88 * conservation. So we strongly advise not to change the default
90 * \return the number of jets found, -1 if recomputation not allowed.
92 int recompute_jets(double _f, double _ptmin = 0.0,
93 Esplit_merge_scale _split_merge_scale=SM_pttilde);
95 /// list of protocones found pass-by-pass
96 std::vector<std::vector<Cmomentum> > protocones_list;
98 // random number initialisation
99 static bool init_done; ///< check random generator initialisation
101 #ifdef DEBUG_STABLE_CONES
102 int nb_hash_cones_total, nb_hash_occupied_total;
106 bool rerun_allowed; ///< is recompute_jets allowed ?
110 // finally, a bunch of functions to access to
111 // basic information (package name, version)
112 //---------------------------------------------
115 * return SISCone package name.
116 * This is nothing but "SISCone", it is a replacement to the
117 * PACKAGE_NAME string defined in config.h and which is not
119 * \return the SISCone name as a string
121 std::string siscone_package_name();
124 * return SISCone version number.
125 * \return a string of the form "X.Y.Z" with possible additional tag
126 * (alpha, beta, devel) to mention stability status
128 std::string siscone_version();