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 // -*- C++ -*-
 #ifndef Herwig_VectorTo3PseudoScalarDalitz_H
 #define Herwig_VectorTo3PseudoScalarDalitz_H
 //
 // This is the declaration of the VectorTo3PseudoScalarDalitz class.
 //
 
 #include "DalitzBase.h"
 #include "ThePEG/Helicity/LorentzPolarizationVector.h"
 
 namespace Herwig {
 
 using namespace ThePEG;
 
 /**
  * The VectorTo3PseudoScalarDalitz class provides a base class for the decay of vector mesons to 3 pseudoscalar mesons
  *
  * @see \ref VectorTo3PseudoScalarDalitzInterfaces "The interfaces"
  * defined for VectorTo3PseudoScalarDalitz.
  */
 class VectorTo3PseudoScalarDalitz: public DalitzBase {
 
 public:
 
   /**
    * The default constructor.
    */
   VectorTo3PseudoScalarDalitz() : coupling_(1./GeV)
   {}
 
   /**
    * Return the matrix element squared for a given mode and phase-space channel.
    * @param ichan The channel we are calculating the matrix element for. 
    * @param part The decaying Particle.
    * @param outgoing The particles produced in the decay
    * @param momenta  The momenta of the particles produced in the decay
    * @param meopt Option for the calculation of the matrix element
    * @return The matrix element squared for the phase-space configuration.
    */
   virtual double me2(const int ichan,const Particle & part,
              const tPDVector & outgoing,
              const vector<Lorentz5Momentum> & momenta,
              MEOption meopt) const;
 
   /**
    *   Construct the SpinInfos for the particles produced in the decay
    */
   virtual void constructSpinInfo(const Particle & part,
                  ParticleVector outgoing) const;
 
   /**
    * Output the setup information for the particle database
    * @param os The stream to output the information to
    * @param header Whether or not to output the information for MySQL
    */
   virtual void dataBaseOutput(ofstream & os,bool header) const;
 
   /**
    * Method to return an object to calculate the 3 body partial width.
    * @param dm The DecayMode
    * @return A pointer to a WidthCalculatorBase object capable of calculating the width
    */
   virtual WidthCalculatorBasePtr threeBodyMEIntegrator(const DecayMode & dm) const;
 
   /**
    * The matrix element to be integrated for the three-body decays as a function
    * of the invariant masses of pairs of the outgoing particles.
    * @param imode The mode for which the matrix element is needed.
    * @param q2 The scale, \e i.e. the mass squared of the decaying particle.
    * @param s3 The invariant mass squared of particles 1 and 2, \f$s_3=m^2_{12}\f$.
    * @param s2 The invariant mass squared of particles 1 and 3, \f$s_2=m^2_{13}\f$.
    * @param s1 The invariant mass squared of particles 2 and 3, \f$s_1=m^2_{23}\f$.
    * @param m1 The mass of the first  outgoing particle.
    * @param m2 The mass of the second outgoing particle.
    * @param m3 The mass of the third  outgoing particle.
    * @return The matrix element
    */
   virtual double threeBodyMatrixElement(const int imode, const Energy2 q2,
                     const  Energy2 s3, const Energy2 s2, const 
                     Energy2 s1, const Energy m1,
                     const Energy m2, const Energy m3) const;
 
 public:
 
   /** @name Functions used by the persistent I/O system. */
   //@{
   /**
    * Function used to write out object persistently.
    * @param os the persistent output stream written to.
    */
   void persistentOutput(PersistentOStream & os) const;
 
   /**
    * Function used to read in object persistently.
    * @param is the persistent input stream read from.
    * @param version the version number of the object when written.
    */
   void persistentInput(PersistentIStream & is, int version);
   //@}
 
   /**
    * The standard Init function used to initialize the interfaces.
    * Called exactly once for each class by the class description system
    * before the main function starts or
    * when this class is dynamically loaded.
    */
   static void Init();
 
 protected:
 
   /** @name Clone Methods. */
   //@{
   /**
    * Make a simple clone of this object.
    * @return a pointer to the new object.
    */
   virtual IBPtr clone() const;
 
   /** Make a clone of this object, possibly modifying the cloned object
    * to make it sane.
    * @return a pointer to the new object.
    */
   virtual IBPtr fullclone() const;
   //@}
 
 protected:
   
   /**
    *  Calculate the amplitude
    */
   virtual complex<InvEnergy2> amplitude(int ichan) const {
     complex<InvEnergy2> amp(ZERO);
     int iloc=-1;
     for(int ix=0;ix<int(resonances().size());++ix) {
       ++iloc;
       if(channel1()>=0) {
     if(ix!=channel1() && ix!=channel2()) continue;
       }
       if(ichan>=0&&ichan!=iloc) continue;
       amp += resAmp(ix);
     }
     return amp;
   }
 
   /**
    * Calculate the amplitude for the ith resonance
    */
   complex<InvEnergy2> resAmp(unsigned int i) const;
 
 private:
 
   /**
    * The assignment operator is private and must never be called.
    * In fact, it should not even be implemented.
    */
   VectorTo3PseudoScalarDalitz & operator=(const VectorTo3PseudoScalarDalitz &) = delete;
 
 private:
 
   /**
    *  Coupling for the normalisation of the mode
    */
   InvEnergy coupling_;
 
   /**
    *   Storage of the kinematics
    */
   //@{
   /**
    *   Mass of the parent
    */
   mutable Energy mD_;
 
   /**
    *   Masses of the children
    */
   mutable Energy mOut_[3];
 
   /**
    *   Masses of the children
    */
   mutable Energy m2_[3][3];
   //@}
   
   /**
    *  Storage of polarization vectors to try and increase
    *  speed
    */
   mutable vector<Helicity::LorentzPolarizationVector> vectors_;
   
   /**
    *   Storage of the \f$\rho\f$ matrix
    */
   mutable RhoDMatrix rho_;
 
 };
 
 }
 
 #endif /* Herwig_VectorTo3PseudoScalarDalitz_H */

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