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 // -*- C++ -*-
 //
 // HwppSelector.h is a part of Herwig - A multi-purpose Monte Carlo event generator
 // Copyright (C) 2002-2019 The Herwig Collaboration
 //
 // Herwig is licenced under version 3 of the GPL, see COPYING for details.
 // Please respect the MCnet academic guidelines, see GUIDELINES for details.
 //
 #ifndef HERWIG_HwppSelector_H
 #define HERWIG_HwppSelector_H
 //
 // This is the declaration of the HwppSelector class.
 //
 
 #include "HadronSelector.h"
 
 namespace Herwig {
 
 using namespace ThePEG;
 
 /** \ingroup hadronization
  * The HwppSelector class selects the hadrons produced in cluster decay using
  * the Herwig variant of the cluster model.
  *
  * @see \ref HwppSelectorInterfaces "The interfaces"
  * defined for HwppSelector.
  */
 class HwppSelector: public HadronSelector {
 
 public:
 
   /**
    * The default constructor.
    */
   HwppSelector() : HadronSelector(1),
            _pwtDquark( 1.0 ),_pwtUquark( 1.0 ),_pwtSquark( 1.0 ),_pwtCquark( 0.0 ),
            _pwtBquark( 0.0 ),_pwtDIquark(1.0 ),
            _sngWt( 1.0 ), _decWt( 1.0 ),
            _mode(1), _enhanceSProb(0), _m0Decay(1.*GeV),
            _scHadronWtFactor(1.), _sbHadronWtFactor(1.)
   {}
 
 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:
   
   /**
    *  Weights for baryons
    */
   virtual double baryonWeight(long id) const;
 
   /**
    *  Whether to select a meson or a baryon
    */
   std::tuple<bool,bool,bool> selectBaryon(const Energy cluMass, tcPDPtr par1, tcPDPtr par2) const;
 
   /**
    *  Strange quark weight
    */
   virtual double strangeWeight(const Energy cluMass, tcPDPtr par1, tcPDPtr par2) const;
 
   /**
    *  Returns the mass of the lightest pair of baryons.
    * @param ptr1 is the first  constituent
    * @param ptr2 is the second constituent
    */
   inline Energy massLightestBaryonPair(tcPDPtr ptr1, tcPDPtr ptr2) const {
     map<pair<long,long>,tcPDPair>::const_iterator lightest =
       lightestBaryons_.find(make_pair(abs(ptr1->id()),abs(ptr2->id())));
     assert(lightest!=lightestBaryons_.end());
     return lightest->second.first->mass()+lightest->second.second->mass();
   }
   
   /**
    *  Returns the mass of the lightest pair of baryons.
    * @param ptr1 is the first  constituent
    * @param ptr2 is the second constituent
    */
   tcPDPair lightestBaryonPair(tcPDPtr ptr1, tcPDPtr ptr2) const;
 
 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.
    */
   HwppSelector & operator=(const HwppSelector &) = delete;
 
 private:
 
   /**
    *  The weights for the different quarks and diquarks
    */
   //@{
   /**
    * The probability of producting a down quark.
    */
   double _pwtDquark;
 
   /**
    * The probability of producting an up quark.
    */
   double _pwtUquark;
 
   /**
    * The probability of producting a strange quark.
    */
   double _pwtSquark;
 
   /**
    * The probability of producting a charm quark.
    */
   double _pwtCquark;
 
   /**
    * The probability of producting a bottom quark.
    */
   double _pwtBquark;
 
   /**
    * The probability of producting a diquark.
    */
   double _pwtDIquark;
   //@}
 
   /**
    * Singlet and Decuplet weights
    */
   //@{
   /**
    *  The singlet weight
    */
   double _sngWt;
 
   /**
    *  The decuplet weight
    */
   double _decWt;
   //@}
   
 private:
 
   /**
    *  Which algorithm to use
    */
   unsigned int _mode;
 
   /**
   *  Flag that switches between no strangeness enhancement, scaling enhancement,
   *  and exponential enhancement (in numerical order)
   */
   int _enhanceSProb;
 
   /**
   *  Parameter that governs the strangeness enhancement scaling
   */
   Energy _m0Decay;
 
   /**
   *  Flag that switches between mass measures used in strangeness enhancement:
   *  cluster mass, or the lambda measure -  ( m_{clu}^2 - (m_q + m_{qbar})^2 )
   */
   int _massMeasure;
 
   /**
   *  Constant variable that stops the scale in strangeness enhancement from
   *  becoming too large
   */
   const double _maxScale = 20.;
 
   /**
   *  Heavy strange-charm hadron wight coefficient
   */
   double _scHadronWtFactor;
 
   /**
   *  Heavy strange-bottom hadron wight coefficient
   */
   double _sbHadronWtFactor;
 
   /**
    *  Caches of lightest pairs for speed
    */
   //@{
   /**
    * Masses of lightest baryon pair
    */
   map<pair<long,long>,tcPDPair> lightestBaryons_;
   //@}
 
 };
 
 }
 
 #endif /* HERWIG_HwppSelector_H */

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