RemnantDecayer.h

// -*- C++ -*-
//
// RemnantDecayer.h is a part of ThePEG - Toolkit for HEP Event Generation
// Copyright (C) 1999-2007 Leif Lonnblad
//
// ThePEG is licenced under version 2 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
#ifndef THEPEG_RemnantDecayer_H
#define THEPEG_RemnantDecayer_H
//
// This is the declaration of the RemnantDecayer class.
//

#include "ThePEG/PDT/Decayer.h"
#include "RemnantDecayer.fh"
#include "ThePEG/PDT/RemnantData.h"
#include "ThePEG/EventRecord/RemnantParticle.h"
#include "ThePEG/Handlers/PtGenerator.h"

namespace ThePEG {

class RemnantDecayer: public Decayer {

public:

  typedef Ptr<PtGenerator>::pointer PtGPtr;

public:

  enum RecoilOption {
    boostAll,   
    boostFinal, 
    copyFinal   
  };

public:

  RemnantDecayer() : respectDIS(2), theRecoilOption(copyFinal) {}

  virtual ~RemnantDecayer();

public:

  virtual bool accept(const DecayMode & dm) const;

  virtual bool needsFullStep() const;

  virtual ParticleVector decay(const DecayMode & dm, const Particle & p,
                               Step & step) const = 0;

  virtual ParticleVector decay(const DecayMode & dm, const Particle & p) const;

  virtual bool canHandle(tcPDPtr parent, tcPDPtr extracted) const;

  virtual bool checkExtract(tcPPtr parent, tcPPtr extracted,
                            const LorentzMomentum & pnew) const;

  virtual bool multiCapable() const;

  RecoilOption recoilOption() const { return theRecoilOption; }

  int respectDISKinematics() const { return respectDIS; }

  PtGPtr pTGenerator() const { return thePTGenerator; }

  static tPVector decayRemnants(const tPVector & particles, Step & step);

protected:

  tRemPDPtr data(tcRemPPtr remnant) const { return remnant->remData; }

  tcPPtr parent(tcRemPPtr remnant) const { return remnant->parent; }

  const PVector & extracted(tcRemPPtr remnant) const {
    return remnant->extracted();
  }

  virtual void fillSubSystem(tPPtr p, set<tPPtr> & sub) const;

  virtual tPVector getSubSystem(tcPPtr parent, tPPtr parton) const;

  static LorentzRotation getZBoost(const LorentzMomentum & p0,
                                   const LorentzMomentum & p);

public:

  struct SubSystemFail: public Exception {};

protected:

  virtual void doinit();

  virtual bool preInitialize() const;

public:

  void persistentOutput(PersistentOStream & os) const;

  void persistentInput(PersistentIStream & is, int version);

  static void Init();

protected:
  mutable int respectDIS;

private:

  RecoilOption theRecoilOption;

  PtGPtr thePTGenerator;

private:

  static AbstractClassDescription<RemnantDecayer> initRemnantDecayer;

  RemnantDecayer & operator=(const RemnantDecayer &);

};

}

#include "ThePEG/Utilities/ClassTraits.h"

namespace ThePEG {

template <>
struct BaseClassTrait<RemnantDecayer,1> {
  typedef Decayer NthBase;
};

template <>
struct ClassTraits<RemnantDecayer>
  : public ClassTraitsBase<RemnantDecayer> {
  static string className() { return "ThePEG::RemnantDecayer"; }
};

}

#endif /* THEPEG_RemnantDecayer_H */

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