TwoPionRhoCurrent.h

// -*- C++ -*-
//
// TwoPionRhoCurrent.h is a part of Herwig - A multi-purpose Monte Carlo event generator
// Copyright (C) 2002-2019 The Herwig Collaboration
//
// Herwig is licenced under version 3 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
#ifndef HERWIG_TwoPionRhoCurrent_H
#define HERWIG_TwoPionRhoCurrent_H
// This is the declaration of the TwoPionRhoCurrent class.
 
#include "WeakCurrent.h"
#include "ThePEG/PDT/EnumParticles.h"
#include "Herwig/Utilities/Kinematics.h"
#include "ThePEG/StandardModel/StandardModelBase.h"
#include "Herwig/Decay/ResonanceHelpers.h"
 
namespace Herwig {
using namespace ThePEG;
 
class TwoPionRhoCurrent: public WeakCurrent {
 
public:
 
  TwoPionRhoCurrent();
 
  virtual bool createMode(int icharge, tcPDPtr resonance,
                          FlavourInfo flavour,
                          unsigned int imode,PhaseSpaceModePtr mode,
                          unsigned int iloc,int ires,
                          PhaseSpaceChannel phase, Energy upp );
 
  virtual tPDVector particles(int icharge, unsigned int imode, int iq, int ia);
 
  virtual vector<LorentzPolarizationVectorE> 
  current(tcPDPtr resonance,
          FlavourInfo flavour,
          const int imode, const int ichan,Energy & scale,
          const tPDVector & outgoing,
          const vector<Lorentz5Momentum> & momenta,
          DecayIntegrator::MEOption meopt) const;
 
  virtual bool accept(vector<int> id);
 
  virtual unsigned int decayMode(vector<int> id);
 
  virtual void dataBaseOutput(ofstream & os,bool header,bool create) const;
 
public:
 
  void persistentOutput(PersistentOStream & os) const;
 
  void persistentInput(PersistentIStream & is, int version);
 
  static void Init();
 
protected:
 
  virtual IBPtr clone() const {return new_ptr(*this);}
 
  virtual IBPtr fullclone() const {return new_ptr(*this);}
 
protected:
 
 
  virtual void doinit();
 
private:
 
  TwoPionRhoCurrent & operator=(const TwoPionRhoCurrent &) = delete;
 
private:
 
  Complex BreitWigner(Energy2 q2, unsigned int imodel,
                      unsigned int ires) const {
    // calculate the BW
    if(imodel==0) {
      return Resonance::BreitWignerPWave(q2,_mass[ires],_width[ires],
                                         _massa[ires],_massb[ires]);
    }
    else if(imodel==1) {
      return Resonance::BreitWignerGS(q2,_mass[ires],_width[ires],
                                      _massa[ires],_massb[ires],
                                      _h0[ires],_dh[ires],_hres[ires]);
    }
    else
      assert(false);
  }
 
private:
 
  vector<Complex> _piwgt;
 
  vector<double> _pimag;
 
  vector<double> _piphase;
 
  int _pimodel;
 
  bool _rhoparameters;
 
  vector<Energy> _rhomasses;
 
  vector<Energy> _rhowidths;
 
  vector<Energy> _mass;
 
  vector<Energy> _width;
 
  vector<Energy> _massa,_massb;
 
  vector<double> _dh;
 
  vector<Energy2> _hres;
 
  vector<Energy2> _h0;
};
 
}
 
 
#endif /* HERWIG_TwoPionRhoCurrent_H */