Rivet  3.1.2
BeamThrust.hh
1 // -*- C++ -*-
2 #ifndef RIVET_BeamThrust_HH
3 #define RIVET_BeamThrust_HH
4 
5 #include "Rivet/Projection.hh"
6 #include "Rivet/Projections/FinalState.hh"
7 #include "Rivet/Event.hh"
8 
9 namespace Rivet {
10 
11 
13  class BeamThrust : public Projection {
14  public:
15 
18 
19  BeamThrust(const FinalState& fsp) {
20  setName("BeamThrust");
21  declare(fsp, "FS");
22  }
23 
26 
27 
28  protected:
29 
31  void project(const Event& e) {
32  const vector<Particle> ps
33  = applyProjection<FinalState>(e, "FS").particles();
34  calc(ps);
35  }
36 
38  CmpState compare(const Projection& p) const {
39  return mkNamedPCmp(p, "FS");
40  }
41 
42 
43  public:
44 
45  double beamthrust() const { return _beamthrust; }
46 
47  public:
48 
51 
52 
54  void calc(const FinalState& fs);
55 
57  void calc(const vector<Particle>& fsparticles);
58 
60  void calc(const vector<FourMomentum>& fsmomenta);
61 
63 
64 
65  private:
66 
68  double _beamthrust;
69 
70  private:
71 
73  void _calcBeamThrust(const vector<FourMomentum>& fsmomenta);
74 
75  };
76 
77 }
78 
79 #endif
void setName(const std::string &name)
Used by derived classes to set their name.
Definition: Projection.hh:142
Definition: MC_Cent_pPb.hh:10
DEFAULT_RIVET_PROJ_CLONE(BeamThrust)
Clone on the heap.
BeamThrust()
Constructor.
Definition: BeamThrust.hh:17
Representation of a HepMC event, and enabler of Projection caching.
Definition: Event.hh:22
Calculator of the beam-thrust observable.
Definition: BeamThrust.hh:13
CmpState compare(const Projection &p) const
Compare projections.
Definition: BeamThrust.hh:38
Project out all final-state particles in an event. Probably the most important projection in Rivet! ...
Definition: FinalState.hh:12
const PROJ & declare(const PROJ &proj, const std::string &name)
Register a contained projection (user-facing version)
Definition: ProjectionApplier.hh:170
Cmp< Projection > mkNamedPCmp(const Projection &otherparent, const std::string &pname) const
void project(const Event &e)
Perform the projection on the Event.
Definition: BeamThrust.hh:31
void calc(const FinalState &fs)
Manually calculate the beamthrust, without engaging the caching system.
Base class for all Rivet projections.
Definition: Projection.hh:29