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 // -*- C++ -*-
 #ifndef Herwig_HQETStrongDecayer_H
 #define Herwig_HQETStrongDecayer_H
 //
 // This is the declaration of the HQETStrongDecayer class.
 //
 
 #include "Herwig/Decay/DecayIntegrator.h"
 #include "Herwig/PDT/HeavyMesonWidthGenerator.fh"
 #include "Herwig/Decay/PhaseSpaceMode.h"
 #include "ThePEG/Helicity/LorentzPolarizationVector.h"
 #include "ThePEG/Helicity/LorentzRank3Tensor.h"
 
 namespace Herwig {
 
 using namespace ThePEG;
 
 /** \ingroup Decay
  * The HQETStrongDecayer class implements the strong decays of excited heavy, i.e. bottom and charm mesons, using
  * heavy quark effective theory results
  *
  * @see \ref HQETStrongDecayerInterfaces "The interfaces"
  * defined for HQETStrongDecayer.
  */
 class HQETStrongDecayer: public DecayIntegrator {
 
   /**
    *  The HeavyMesonWidthGenerator is a friend to get access to the couplings
    */
   friend class HeavyMesonWidthGenerator; 
 
 public:
 
   /**
    * The default constructor.
    */
   HQETStrongDecayer();
 
   /**
    * 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;
 
   /**
    * Specify the \f$1\to2\f$ matrix element to be used in the running width calculation.
    * @param dm The DecayMode
    * @param mecode The code for the matrix element as described
    *               in the GenericWidthGenerator class, in this case 7.
    * @param coupling The coupling for the matrix element.
    * @return True or False if this mode can be handled.
    */
   bool twoBodyMEcode(const DecayMode & dm, int & mecode, double & coupling) 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;
 
 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 and
    * EventGenerator to disk.
    * @throws InitException if object could not be initialized properly.
    */
   virtual void doinit();
 
   /**
    * Initialize this object to the begining of the run phase.
    */
   virtual void doinitrun();
   //@}
 
 private:
 
   /**
    * The assignment operator is private and must never be called.
    * In fact, it should not even be implemented.
    */
   HQETStrongDecayer & operator=(const HQETStrongDecayer &) = delete;
   
 public:
 
   /**
    *   Set the parameters for a decay mode
    */
   string setUpDecayMode(string arg);
 
 private:
 
   /**
    *  Coupings for the decays
    */
   //@{
   /**
    *  Pion decay constant
    */
   Energy fPi_;
 
   /**
    *  Coupling for decays within the \f$(0^-,1^-)\f$ multiplet
    */
   double g_;
 
   /**
    *  Coupling for decays within the \f$(0^+,1^+)\f$ multiplet
    */
   double gp_;
 
   /**
    *  Coupling for decays from the \f$(0^+ ,1^+)\f$ multiplet
    */
   double h_;
 
   /**
    *  Coupling for decays from the \f$(1^+ ,2^+)\f$ multiplet
    */
   double hp_;
 
   /**
    *  Coupling for decays from the \f$(2^- ,3^-)\f$ multiplet
    */
   double k_;
 
   /**
    *  Coupling for decays from the \f$(1^- ,2^-)\f$ multiplet
    */
   double kp_;
 
   /**
    *  Coupling for decays from the 2S \f$(0^-,1^-)\f$ multiplet
    */
   double gtilde_;
   
   /**
    *  D_1 mixing angle (up and down)
    */
   double psiL_;
 
   /**
    *  D_1 mixing angle (strange)
    */
   double psiS_;
 
   /**
    *   \f$\eta-\pi^0 \f$ mixing for isospin violating decays
    */
   double deltaEta_;
   //@}
 
   /**
    *   A momentum scale characterising the convergence of the
    *   derivative expansion. We expect Lambda_ ~ 1 GeV.
    */
   Energy Lambda_;
   //@}
 
   /**
    *  Particles etc for thye different modes
    */
   //@{
   /**
    * the PDG codes for the incoming particles
    */
   vector<long> incoming_;
 
   /**
    * the PDG codes for outgoing heavy meson
    */
   vector<pair<long,long> > outgoing_;
 
   /**
    * the maximum weight for the decay
    */
   vector<double> maxWeight_;
   //@}
 
   /**
    *  Storage of wavefunctions etx
    */
   //@{
   /**
    *   Storage of the \f$\rho\f$ matrix
    */
   mutable RhoDMatrix rho_;
 
   /**
    *  Storage of polarization vectors of the decaying particle
    */
   mutable vector<Helicity::LorentzPolarizationVector> vecIn_;
 
   /**
    *  Storage of polarization tensors of the decaying particle
    */
   mutable vector<Helicity::LorentzTensor<double> > tensorIn_;
 
   /**
    *  Storage of polarization tensors of the decaying particle
    */
   mutable vector<Helicity::LorentzRank3Tensor<double> > spin3In_;
 
   /**
    *  Storage of polarization vectors of the decay product
    */
   mutable vector<Helicity::LorentzPolarizationVector> vecOut_;
   //@}
 
 };
 
 }
 
 #endif /* Herwig_HQETStrongDecayer_H */

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