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 // -*- C++ -*-
 #ifndef Herwig_f1FourPiDecayer_H
 #define Herwig_f1FourPiDecayer_H
 //
 // This is the declaration of the f1FourPiDecayer class.
 //
 
 #include "DecayIntegrator.h"
 
 namespace Herwig {
 
 using namespace ThePEG;
 
 /**
  * Here is the documentation of the f1FourPiDecayer class.
  *
  * @see \ref f1FourPiDecayerInterfaces "The interfaces"
  * defined for f1FourPiDecayer.
  */
 class f1FourPiDecayer: public DecayIntegrator {
 
 public:
 
   /**
    * The default constructor.
    */
   f1FourPiDecayer();
 
   /**
    * Which of the possible decays is required
    * @param cc Is this mode the charge conjugate
    * @param parent The decaying particle
    * @param children The decay products
    */
   virtual int modeNumber(bool & cc, tcPDPtr parent, 
              const tPDVector & children) const;
 
   /**
    * 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.
    */
   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;
   
   /**
    * For a given decay mode and a given particle instance, perform the
    * decay and return the decay products. As this is the base class this
    * is not implemented.
    * @return The vector of particles produced in the decay.
    */
   virtual ParticleVector decay(const Particle & parent,
                    const tPDVector & children) 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:
 
   /** @name Standard Interfaced functions. */
   //@{
   /**
    * Initialize this object after the setup phase before saving an
    * EventGenerator to disk.
    * @throws InitException if object could not be initialized properly.
    */
   virtual void doinit();
 
   /**
    * Initialize this object. Called in the run phase just before
    * a run begins.
    */
   virtual void doinitrun();
   //@}
 
 private:
 
   /**
    * The assignment operator is private and must never be called.
    * In fact, it should not even be implemented.
    */
   f1FourPiDecayer & operator=(const f1FourPiDecayer &) = delete;
 
 private:
 
   /**
    *  rho-pi-pi coupling
    */
   double gRhoPiPi_;
 
   /**
    *  a_1-rho-pi
    */
   Energy ga1RhoPi_;
 
   /**
    *  f1-a1-pi
    */
   InvEnergy gf1a1Pi_;
 
   /**
    *  a1 mass
    */
   Energy ma1_;
 
   /**
    * a1 width
    */
   Energy ga1_;
 
   /**
    *  a1 mass
    */
   Energy mrho_;
 
   /**
    * rho width
    */
   Energy grho_;
   
 
   /**
    *  Weights for the different decay modes
    */
   vector<double> maxWeight_;
 
   /**
    *  Spin Density matrix
    */
   mutable RhoDMatrix rho_;
 
   /**
    *  Polarization vectors
    */
   mutable vector<Helicity::LorentzPolarizationVector> vector_;
   
 };
 
 }
 
 #endif /* Herwig_f1FourPiDecayer_H */

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