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TopTaggerBase.hh
1 #ifndef __FASTJET_TOP_TAGGER_BASE_HH__
2 #define __FASTJET_TOP_TAGGER_BASE_HH__
3 
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5 // $Id: TopTaggerBase.hh 3433 2014-07-23 08:17:03Z salam $
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33 
34 #include <fastjet/internal/base.hh>
35 #include <fastjet/tools/Transformer.hh>
36 
37 FASTJET_BEGIN_NAMESPACE
38 
39 class TopTaggerBase;
40 class TopTaggerBaseStructure;
41 
42 //----------------------------------------------------------------------
43 /// @ingroup tools_taggers
44 /// \class TopTaggerBase
45 /// A base class that provides a common interface for top taggers
46 /// that are able to return a W (in addition to the top itself).
47 ///
48 /// Top taggers that derive from this should satisfy the following
49 /// criteria:
50 ///
51 /// - their underlying structure should derive from TopTaggerBaseStructure
52 /// - tagged tops should have two pieces, the first of which is the W candidate
53 /// - they should apply the top and W selectors to decide if the top has been
54 /// tagged
55 class TopTaggerBase : public Transformer {
56 public:
57  TopTaggerBase() : _top_selector(SelectorIdentity()),
58  _W_selector(SelectorIdentity()),
59  _top_selector_set(false),
60  _W_selector_set(false) {}
61 
62  /// the type of the associated structure
64 
65  /// sets the selector that is applied to the top candidate
66  void set_top_selector(const Selector & sel) {_top_selector = sel; _top_selector_set = true;}
67  /// sets the selector that is applied to the W candidate
68  void set_W_selector (const Selector & sel) {_W_selector = sel; _W_selector_set = true;}
69 
70  /// returns a description of the top and W selectors
71  virtual std::string description_of_selectors() const {
72  std::string descr;
73  if (_top_selector_set) descr = ", top selector: "+_top_selector.description();
74  if (_W_selector_set) descr += ", W selector: "+_W_selector.description();
75  return descr;
76  }
77 
78 protected:
79  /// computes the W helicity angle
80  double _cos_theta_W(const PseudoJet & result) const;
81 
82  Selector _top_selector, _W_selector;
83  bool _top_selector_set, _W_selector_set;
84 };
85 
86 
87 //----------------------------------------------------------------------
88 /// @ingroup tools_taggers
89 /// \class TopTaggerBaseStructure
90 /// class that specifies the structure common to all top taggers
91 ///
92 /// Note that this specifies only the W, non_W part of the
93 /// interface. An actual top tagger structure class will also need to
94 /// derive from a PseudoJetStructureBase type class
95 /// (e.g. CompositeJetStructure)
97 public:
98  virtual const PseudoJet & W() const = 0;
99  virtual const PseudoJet & non_W() const = 0;
100  virtual ~TopTaggerBaseStructure() {}
101 };
102 
103 
104 FASTJET_END_NAMESPACE
105 
106 #endif // __FASTJET_TOP_TAGGER_BASE_HH__
107 
void set_W_selector(const Selector &sel)
sets the selector that is applied to the W candidate
Base (abstract) class for a jet transformer.
Definition: Transformer.hh:71
void set_top_selector(const Selector &sel)
sets the selector that is applied to the top candidate
A base class that provides a common interface for top taggers that are able to return a W (in additio...
Class that encodes information about cuts and other selection criteria that can be applied to PseudoJ...
Definition: Selector.hh:149
virtual std::string description_of_selectors() const
returns a description of the top and W selectors
TopTaggerBaseStructure StructureType
the type of the associated structure
class that specifies the structure common to all top taggers
Class to contain pseudojets, including minimal information of use to jet-clustering routines...
Definition: PseudoJet.hh:67