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 // -*- C++ -*-
 #ifndef HERWIG_SingletonFormFactor_H
 #define HERWIG_SingletonFormFactor_H
 //
 // This is the declaration of the SingletonFormFactor class.
 //
 
 #include "BaryonFormFactor.h"
 #include "ThePEG/PDT/ParticleData.h"
 #include "ThePEG/PDT/ParticleData.h"
 
 namespace Herwig {
 using namespace ThePEG;
 
 /** \ingroup Decay
  *
  *  The SingletonFormFactor class implements the form-factors from
  *  PRD43, 2939 for the decay of spin-1/2 baryons containing bottom and charm
  *  quarks.
  *
  * @see BaryonFormFactor
  * 
  */
 class SingletonFormFactor: public BaryonFormFactor {
 
 public:
 
   /**
    * Default constructor
    */
   SingletonFormFactor();
 
 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);
   //@}
 
   /**
    * Standard Init function used to initialize the interfaces.
    */
   static void Init();
 
 public:
 
   /** @name Form Factors */
   //@{
   /**
    * The form factor for the weak decay of a spin \f$\frac12\f$ baryon to a 
    * spin \f$\frac12\f$ baryon.  
    * @param q2 The scale \f$q^2\f$.
    * @param iloc The location in the form factor list.
    * @param id0 The PDG code of the incoming baryon.
    * @param id1 The PDG code of the outgoing baryon.
    * @param m0 The mass of the incoming baryon.
    * @param m1 The mass of the outgoing baryon.
    * @param f1v The form factor \f$F^V_1\f$.
    * @param f2v The form factor \f$F^V_2\f$.
    * @param f3v The form factor \f$F^V_3\f$.
    * @param f1a The form factor \f$F^A_1\f$.
    * @param f2a The form factor \f$F^A_2\f$.
    * @param f3a The form factor \f$F^A_3\f$.
    * @param virt Whether the q2 is space or timelike
    */
   virtual void SpinHalfSpinHalfFormFactor(Energy2 q2,int iloc, int id0, int id1,
                       Energy m0, Energy m1,
                       Complex & f1v,Complex & f2v,Complex & f3v,
                       Complex & f1a,Complex & f2a,Complex & f3a,
                       FlavourInfo flavour,
                       Virtuality virt=SpaceLike);
   //@}
 
   /**
    * 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
    * @param create Whether or not to add a statement creating the object
    */
   virtual void dataBaseOutput(ofstream & os,bool header,bool create) const;
 
 protected:
 
   /** @name Clone Methods. */
   //@{
   /**
    * Make a simple clone of this object.
    * @return a pointer to the new object.
    */
   virtual IBPtr clone() const {return new_ptr(*this);}
 
   /** 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 {return new_ptr(*this);}
   //@}
 
 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();
   //@}
 
 private:
 
   /**
    * Private and non-existent assignment operator.
    */
   SingletonFormFactor & operator=(const SingletonFormFactor &) = delete;
 
 private:
 
   /**
    * The charm quark mass.
    */
   Energy _mcharm;
 
   /**
    * The strange quark mass.
    */
   Energy _mstrange;
 
   /**
    *  The mixing angle for the \f$\Lambda\f$.
    */
   double _thetalambda;
 
   /**
    *  The mixing angle for the \f$\Sigma\f$.
    */
   double _thetasigma;
 
   /**
    *  The mixing angle for the \f$\Xi\f$.
    */
   double _thetaxi;
 
   /**
    *  The mixing angle for the \f$\Xi'\f$.
    */
   double _thetaxip;
 
   /**
    *  The pole masses for the \f$q^2\f$ dependence of the form factors.
    */
   vector<Energy> _polemass;
 
   /**
    *  The \f$\xi\f$ parameter for the form factors.
    */
   vector<double> _xi;
 
   /**
    *  The normalisation factor, \f$N_{mM}\f$, for the form factors.
    */
   vector<double> _nmM;
 
   /**
    *  The mass of the quark for the form factor.
    */
   vector<Energy> _mquark;
 
 };
 
 }
 
 #endif /* HERWIG_SingletonFormFactor_H */

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