1 | #ifndef __FASTJET_TOP_TAGGER_BASE_HH__
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2 | #define __FASTJET_TOP_TAGGER_BASE_HH__
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3 |
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4 | //FJSTARTHEADER
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5 | // $Id: TopTaggerBase.hh 3433 2014-07-23 08:17:03Z salam $
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6 | //
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7 | // Copyright (c) 2005-2014, Matteo Cacciari, Gavin P. Salam and Gregory Soyez
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8 | //
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9 | //----------------------------------------------------------------------
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10 | // This file is part of FastJet.
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11 | //
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12 | // FastJet is free software; you can redistribute it and/or modify
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13 | // it under the terms of the GNU General Public License as published by
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14 | // the Free Software Foundation; either version 2 of the License, or
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15 | // (at your option) any later version.
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16 | //
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17 | // The algorithms that underlie FastJet have required considerable
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18 | // development. They are described in the original FastJet paper,
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19 | // hep-ph/0512210 and in the manual, arXiv:1111.6097. If you use
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20 | // FastJet as part of work towards a scientific publication, please
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21 | // quote the version you use and include a citation to the manual and
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22 | // optionally also to hep-ph/0512210.
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23 | //
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24 | // FastJet is distributed in the hope that it will be useful,
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25 | // but WITHOUT ANY WARRANTY; without even the implied warranty of
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26 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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27 | // GNU General Public License for more details.
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28 | //
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29 | // You should have received a copy of the GNU General Public License
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30 | // along with FastJet. If not, see <http://www.gnu.org/licenses/>.
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31 | //----------------------------------------------------------------------
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32 | //FJENDHEADER
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33 |
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34 | #include <fastjet/internal/base.hh>
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35 | #include <fastjet/tools/Transformer.hh>
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36 |
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37 | FASTJET_BEGIN_NAMESPACE
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38 |
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39 | class TopTaggerBase;
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40 | class TopTaggerBaseStructure;
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41 |
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42 | //----------------------------------------------------------------------
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43 | /// @ingroup tools_taggers
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44 | /// \class TopTaggerBase
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45 | /// A base class that provides a common interface for top taggers
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46 | /// that are able to return a W (in addition to the top itself).
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47 | ///
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48 | /// Top taggers that derive from this should satisfy the following
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49 | /// criteria:
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50 | ///
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51 | /// - their underlying structure should derive from TopTaggerBaseStructure
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52 | /// - tagged tops should have two pieces, the first of which is the W candidate
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53 | /// - they should apply the top and W selectors to decide if the top has been
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54 | /// tagged
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55 | class TopTaggerBase : public Transformer {
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56 | public:
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57 | TopTaggerBase() : _top_selector(SelectorIdentity()),
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58 | _W_selector(SelectorIdentity()),
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59 | _top_selector_set(false),
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60 | _W_selector_set(false) {}
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61 |
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62 | /// the type of the associated structure
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63 | typedef TopTaggerBaseStructure StructureType;
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64 |
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65 | /// sets the selector that is applied to the top candidate
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66 | void set_top_selector(const Selector & sel) {_top_selector = sel; _top_selector_set = true;}
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67 | /// sets the selector that is applied to the W candidate
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68 | void set_W_selector (const Selector & sel) {_W_selector = sel; _W_selector_set = true;}
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69 |
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70 | /// returns a description of the top and W selectors
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71 | virtual std::string description_of_selectors() const {
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72 | std::string descr;
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73 | if (_top_selector_set) descr = ", top selector: "+_top_selector.description();
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74 | if (_W_selector_set) descr += ", W selector: "+_W_selector.description();
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75 | return descr;
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76 | }
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77 |
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78 | protected:
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79 | /// computes the W helicity angle
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80 | double _cos_theta_W(const PseudoJet & result) const;
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81 |
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82 | Selector _top_selector, _W_selector;
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83 | bool _top_selector_set, _W_selector_set;
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84 | };
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85 |
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86 |
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87 | //----------------------------------------------------------------------
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88 | /// @ingroup tools_taggers
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89 | /// \class TopTaggerBaseStructure
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90 | /// class that specifies the structure common to all top taggers
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91 | ///
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92 | /// Note that this specifies only the W, non_W part of the
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93 | /// interface. An actual top tagger structure class will also need to
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94 | /// derive from a PseudoJetStructureBase type class
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95 | /// (e.g. CompositeJetStructure)
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96 | class TopTaggerBaseStructure {
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97 | public:
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98 | virtual const PseudoJet & W() const = 0;
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99 | virtual const PseudoJet & non_W() const = 0;
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100 | virtual ~TopTaggerBaseStructure() {}
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101 | };
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102 |
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103 |
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104 | FASTJET_END_NAMESPACE
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105 |
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106 | #endif // __FASTJET_TOP_TAGGER_BASE_HH__
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107 |
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