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Herwig 7.3.0
VectorMesonTensorVectorDecayer.h
1// -*- C++ -*-
2//
3// VectorMesonTensorVectorDecayer.h is a part of Herwig - A multi-purpose Monte Carlo event generator
4// Copyright (C) 2002-2019 The Herwig Collaboration
5//
6// Herwig is licenced under version 3 of the GPL, see COPYING for details.
7// Please respect the MCnet academic guidelines, see GUIDELINES for details.
8//
9#ifndef HERWIG_VectorMesonTensorVectorDecayer_H
10#define HERWIG_VectorMesonTensorVectorDecayer_H
11//
12// This is the declaration of the VectorMesonTensorVectorDecayer class.
13//
14#include "Herwig/Decay/DecayIntegrator.h"
15#include "Herwig/Decay/PhaseSpaceMode.h"
16#include "ThePEG/Helicity/LorentzTensor.h"
17
18namespace Herwig {
19using namespace ThePEG;
20
45
46public:
47
54 virtual int modeNumber(bool & cc, tcPDPtr parent,
55 const tPDVector & children) const;
56
66 double me2(const int ichan,const Particle & part,
67 const tPDVector & outgoing,
68 const vector<Lorentz5Momentum> & momenta,
69 MEOption meopt) const;
70
74 virtual void constructSpinInfo(const Particle & part,
76
85 bool twoBodyMEcode(const DecayMode & dm, int & mecode, double & coupling) const;
86
92 virtual void dataBaseOutput(ofstream & os,bool header) const;
93
94public:
95
103
109 void persistentInput(PersistentIStream & is, int version);
111
115 static void Init();
116
117protected:
118
125 virtual IBPtr clone() const {return new_ptr(*this);}
126
131 virtual IBPtr fullclone() const {return new_ptr(*this);}
133
134protected:
135
143 virtual void doinit();
144
148 virtual void doinitrun();
150
151private:
152
157
158public:
159
163 string setUpDecayMode(string arg);
164
165private:
166
170 vector<int> incoming_;
171
175 vector<pair<int,int> > outgoing_;
176
180 vector<Energy> coupling_;
181
185 vector<double> maxWeight_;
186
191 mutable vector<Helicity::LorentzTensor<double> > tensors_;
192
196 mutable vector<Helicity::LorentzPolarizationVector > vectors_[2];
197
202
203};
204
205}
206
207#endif /* HERWIG_VectorMesonTensorVectorDecayer_H */
Main class for Decayers implementing multi-channel phase space integration.
MEOption
Enum for the matrix element option.
The VectorMesonTensorVectorDecayer class is designed to simulate the decay of a vector meson to a ten...
double me2(const int ichan, const Particle &part, const tPDVector &outgoing, const vector< Lorentz5Momentum > &momenta, MEOption meopt) const
Return the matrix element squared for a given mode and phase-space channel.
VectorMesonTensorVectorDecayer & operator=(const VectorMesonTensorVectorDecayer &)=delete
Private and non-existent assignment operator.
vector< double > maxWeight_
the maximum weight for the decay
bool twoBodyMEcode(const DecayMode &dm, int &mecode, double &coupling) const
Specify the matrix element to be used in the running width calculation.
virtual int modeNumber(bool &cc, tcPDPtr parent, const tPDVector &children) const
Which of the possible decays is required.
vector< Energy > coupling_
the coupling for the decay
vector< Helicity::LorentzPolarizationVector > vectors_[2]
Storage of the polarization vectors.
virtual void doinitrun()
Initialize this object to the begining of the run phase.
vector< pair< int, int > > outgoing_
the PDG codes for the outgoing particles
virtual void doinit()
Initialize this object after the setup phase before saving and EventGenerator to disk.
virtual IBPtr fullclone() const
Make a clone of this object, possibly modifying the cloned object to make it sane.
vector< Helicity::LorentzTensor< double > > tensors_
Storage of polarization tensors to try and increase speed.
void persistentOutput(PersistentOStream &os) const
Function used to write out object persistently.
static void Init()
Standard Init function used to initialize the interfaces.
string setUpDecayMode(string arg)
Set the parameters for a decay mode.
virtual void dataBaseOutput(ofstream &os, bool header) const
Output the setup information for the particle database.
virtual void constructSpinInfo(const Particle &part, ParticleVector outgoing) const
Construct the SpinInfos for the particles produced in the decay.
vector< int > incoming_
the PDG codes for the incoming particles
virtual IBPtr clone() const
Make a simple clone of this object.
void persistentInput(PersistentIStream &is, int version)
Function used to read in object persistently.
-*- C++ -*-
ThePEG::Ptr< InterfacedBase >::pointer IBPtr
vector< tPDPtr > tPDVector
vector< PPtr > ParticleVector
ThePEG::Ptr< ParticleData >::transient_const_pointer tcPDPtr