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Herwig 7.3.0
ScalarVectorVectorDecayer.h
1// -*- C++ -*-
2//
3// ScalarVectorVectorDecayer.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_ScalarVectorVectorDecayer_H
10#define HERWIG_ScalarVectorVectorDecayer_H
11//
12// This is the declaration of the ScalarVectorVectorDecayer class.
13//
14
15#include "Herwig/Decay/DecayIntegrator.h"
16#include "ThePEG/Helicity/LorentzPolarizationVector.h"
17
18namespace Herwig {
19
20using namespace ThePEG;
21
37
38public:
39
46 virtual int modeNumber(bool & cc, tcPDPtr parent,
47 const tPDVector & children) const;
48
58 double me2(const int ichan,const Particle & part,
59 const tPDVector & outgoing,
60 const vector<Lorentz5Momentum> & momenta,
61 MEOption meopt) const;
62
66 virtual void constructSpinInfo(const Particle & part,
68
77 bool twoBodyMEcode(const DecayMode & dm, int & mecode, double & coupling) const;
78
84 virtual void dataBaseOutput(ofstream & os,bool header) const;
85
86public:
87
95
101 void persistentInput(PersistentIStream & is, int version);
103
110 static void Init();
111
112protected:
113
120 virtual IBPtr clone() const {return new_ptr(*this);}
121
126 virtual IBPtr fullclone() const {return new_ptr(*this);}
128
129protected:
130
138 virtual void doinit();
139
144 virtual void doinitrun();
146
147private:
148
154
155public:
156
160 string setUpDecayMode(string arg);
161
162private:
163
167 vector<int> incoming_;
168
172 vector<pair<long,long> > outgoing_;
173
177 vector<Energy> coupling_;
178
182 vector<double> maxWeight_;
183
188
192 mutable vector<Helicity::LorentzPolarizationVector> vectors_[2];
193};
194
195}
196
197#endif /* HERWIG_ScalarVectorVectorDecayer_H */
Main class for Decayers implementing multi-channel phase space integration.
MEOption
Enum for the matrix element option.
The ScalarVectorVectorDecayer class is designed to perform the decay of a scalar meson to two spin-1 ...
vector< int > incoming_
the PDG code for the incoming particle
virtual int modeNumber(bool &cc, tcPDPtr parent, const tPDVector &children) const
Which of the possible decays is required.
string setUpDecayMode(string arg)
Set the parameters for a decay mode.
virtual IBPtr fullclone() const
Make a clone of this object, possibly modifying the cloned object to make it sane.
vector< Helicity::LorentzPolarizationVector > vectors_[2]
Polarization vectors for the ecay products.
vector< Energy > coupling_
the coupling for the decay, .
virtual void dataBaseOutput(ofstream &os, bool header) const
Output the setup information for the particle database.
virtual IBPtr clone() const
Make a simple clone of this object.
void persistentOutput(PersistentOStream &os) const
Function used to write out object persistently.
vector< pair< long, long > > outgoing_
the PDG code for the first outgoing particle
void persistentInput(PersistentIStream &is, int version)
Function used to read in object persistently.
RhoDMatrix rho_
Spin density matrix.
virtual void doinit()
Initialize this object after the setup phase before saving an EventGenerator to disk.
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.
virtual void constructSpinInfo(const Particle &part, ParticleVector outgoing) const
Construct the SpinInfos for the particles produced in the decay.
virtual void doinitrun()
Initialize this object.
static void Init()
The standard Init function used to initialize the interfaces.
ScalarVectorVectorDecayer & operator=(const ScalarVectorVectorDecayer &)=delete
The assignment operator is private and must never be called.
bool twoBodyMEcode(const DecayMode &dm, int &mecode, double &coupling) const
Specify the matrix element to be used in the running width calculation.
vector< double > maxWeight_
the maximum weight for the decay
-*- C++ -*-
ThePEG::Ptr< InterfacedBase >::pointer IBPtr
vector< tPDPtr > tPDVector
vector< PPtr > ParticleVector
ThePEG::Ptr< ParticleData >::transient_const_pointer tcPDPtr