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 // -*- C++ -*-
 #ifndef Herwig_SMHZPVertex_H
 #define Herwig_SMHZPVertex_H
 //
 // This is the declaration of the SMHZPVertex class.
 //
 
 #include "ThePEG/Helicity/Vertex/Scalar/GeneralVVSVertex.h"
 
 namespace Herwig {
 
 using namespace ThePEG;
 
 /**
  * Here is the documentation of the SMHZPVertex class.
  *
  * @see \ref SMHZPVertexInterfaces "The interfaces"
  * defined for SMHZPVertex.
  */
 class SMHZPVertex: public GeneralVVSVertex {
 
 public:
   
   /**
    * The default constructor.
    */
   SMHZPVertex();
 
   /**
    * Calculate couplings
    *@param q2 Scale at which to evaluate coupling
    *@param part1 ParticleData pointer to first particle
    *@param part2 ParticleData pointer to second particle
    *@param part3 ParticleData pointer to third particle
    */
   virtual void setCoupling(Energy2 q2, tcPDPtr part1, tcPDPtr part2,
                tcPDPtr part3);
 
   /** @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();
   //@}
 
 private:
 
   /**
    * The assignment operator is private and must never be called.
    * In fact, it should not even be implemented.
    */
   SMHZPVertex & operator=(const SMHZPVertex &) = delete;
 
 private:
 
   /**
    *  Functions for the loops from PLB 276 350
    */
   //@{
   /**
    *  The \f$I_1(\tau,\lambda)\f$ function from PLB 276 350
    */
   Complex I1(double tau,double lambda) const;
 
   /**
    *  The \f$I_2(\tau,\lambda)\f$ function from PLB 276 350
    */
   Complex I2(double tau,double lambda) const;
 
   /**
    *  The \f$f(\tau)\f$ function from  PLB 276 350
    */
   Complex f(double tau) const;
 
   /**
    *  The \f$g(\tau)\f$ function from  PLB 276 350
    */
   Complex g(double tau) const;
   //@}
   
 private:
 
   /**
    *Storage of couplings
    */
   //@{
   /**
    * Last value of the coupling calculated
    */
   Complex _couplast;
 
   /**
    * The scale \f$q^2\f$ at which coupling was last evaluated
    */
   Energy2 _q2last;
   //@}
 
   /**
    * Pointer to Standard Model object
    */
   tcHwSMPtr _theSM;
 
   /**
    * The mass of the \f$W\f$ boson.
    */
   Energy _mw;
 
   /**
    * The mass of the \f$Z^0\f$ boson.
    */
   Energy _mz;
 
   /**
    * define quark mass scheme (fixed/running)
    */
   unsigned int _massopt;
 
   /**
    * The minimum flavour number in quark loops
    */
   int _minloop;
 
   /**
    * The maximum flavour number in quark loops
    */
   int _maxloop;
   
 };
 
 }
 
 #endif /* Herwig_SMHZPVertex_H */

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