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 // -*- C++ -*-
 #ifndef Herwig_DalitzBase_H
 #define Herwig_DalitzBase_H
 //
 // This is the declaration of the DalitzBase class.
 //
 
 #include "Herwig/Decay/DecayIntegrator.h"
 #include "Herwig/Decay/FormFactors/KMatrix.h"
 #include "DalitzResonance.h"
 
 namespace Herwig {
 
 using namespace ThePEG;
 
 /**
  * The DalitzBase class provides a base class for the implementation of three-body Dalitz decays.
  *
  * @see \ref DalitzBaseInterfaces "The interfaces"
  * defined for DalitzBase.
  */
 class DalitzBase: public DecayIntegrator {
 
 public:
 
   /**
    * The default constructor.
    */
   DalitzBase() : rParent_(5./GeV), useAllK0_(false),
          maxWgt_(1.), channel1_(-1), channel2_(-1),
          incoming_(0), outgoing_({0,0,0}) {
     // intermediates
     generateIntermediates(true);
   }
 
   /**
    * 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;
 
   /**
    * 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;
 
   /**
    *   Set the parameters for a decay mode
    */
   string addChannel(string arg);
 
   /**
    *   Set the parameters for a decay mode
    */
   string setExternal(string arg);
 
 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:
 
   /**
    *  Add a new resonance
    */
   void addResonance(const DalitzResonancePtr & R) {resonances_.push_back(R);}
 
   /**
    *  Set up the phase-space
    */
   void createMode(tPDPtr in, tPDVector out);
 
   /**
    *  Access to the resonances
    */
   const vector<DalitzResonancePtr> & resonances() const {return resonances_;}
 
   /**
    *   Access to the first channel
    */
   const int & channel1() const {
     return channel1_;
   }
     
   /**
    *   Access to the second channel
    */
   const int & channel2() const {
     return channel2_;
   }
 
   /**
    *  Radius of the parent
    */
   const InvEnergy & parentRadius() const {
     return rParent_;
   }
 
   /**
    *  Weights for the phase-space channels
    */
   const vector<double> & weights() const {return weights_;}
       
 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.
    */
   DalitzBase & operator=(const DalitzBase &) = delete;
 
 private:
 
   /**
    *   The radii for the Blatt-Weisskopf form factors
    */
   //@{
   /**
    *   For the decaying particles
    */
   InvEnergy rParent_;
   //@}
 
   /**
    *  Take all \f$K_0\f$ mesnos to be the same
    */
   bool useAllK0_;
 
   /**
    *  Vector containing the intermediate resonances
    */
   vector<DalitzResonancePtr> resonances_;
   
   /**
    *  Any \f$K\f$-matrices for the decay
    */
   vector<KMatrixPtr> kMatrix_;
   
   /**
    *   Parameters for the phase-space sampling
    */
   //@{
   /**
    *  Maximum weight for the decay
    */
   double maxWgt_;
 
   /**
    *  Weights for the phase-space channels
    */
   vector<double> weights_;
   
 private:
 
   /**
    *  Control over channels to check fit fractions
    */
   int channel1_, channel2_;
 
   /**
    *  The incoming particle
    */
   long incoming_;
 
   /**
    *  The outgoing pairtcles
    */
   array<long,3> outgoing_;
 
 };
 
 }
 
 #endif /* Herwig_DalitzBase_H */

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