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LeptonNeutrinoCurrent.h
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// -*- C++ -*-
//
// LeptonNeutrinoCurrent.h is a part of Herwig++ - A multi-purpose Monte Carlo event generator
// Copyright (C) 2002-2007 The Herwig Collaboration
//
// Herwig++ is licenced under version 2 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
#ifndef HERWIG_LeptonNeutrinoCurrent_H
#define HERWIG_LeptonNeutrinoCurrent_H
//
// This is the declaration of the LeptonNeutrinoCurrent class.
//
#include "WeakDecayCurrent.h"
#include "LeptonNeutrinoCurrent.fh"
namespace Herwig {
using namespace ThePEG;
using ThePEG::Helicity::LorentzPolarizationVector;
/** \ingroup Decay
*
* This class implements the weak decay current for a lepton and a neutrino.
* In this case the current is given by
* \f$J^\mu = \bar{u}(p_\nu)\gamma^\mu(1-\gamma_5)u(p_\ell)\f$
* where
* - \f$p_\nu\f$ is the momentum of the neutrino,
* - \f$p_\ell\f$ is the momentum of the charged lepton.
*
* @see WeakDecayCurrent.
*
*/
class LeptonNeutrinoCurrent: public WeakDecayCurrent {
public:
/**
* Default constructor
*/
LeptonNeutrinoCurrent() {
// set up the modes in the base class
addDecayMode(11,-12);
addDecayMode(13,-15);
addDecayMode(15,-16);
setInitialModes(3);
}
public:
/** @name Methods for the construction of the phase space integrator. */
//@{
/**
* Complete the construction of the decay mode for integration.
* This version just adds the intermediate \f$W\f$ and the leptons.
* @param icharge The total charge of the outgoing particles in the current.
* @param imode The mode in the current being asked for.
* @param mode The phase space mode for the integration
* @param iloc The location of the of the first particle from the current in
* the list of outgoing particles.
* @param ires The location of the first intermediate for the current.
* @param phase The prototype phase space channel for the integration.
* @param upp The maximum possible mass the particles in the current are
* allowed to have.
* @return Whether the current was sucessfully constructed.
*/
virtual bool createMode(int icharge,unsigned int imode,DecayPhaseSpaceModePtr mode,
unsigned int iloc,unsigned int ires,
DecayPhaseSpaceChannelPtr phase,Energy upp);
/**
* The particles produced by the current. This just returns the leptons.
* @param icharge The total charge of the particles in the current.
* @param imode The mode for which the particles are being requested
* @param iq The PDG code for the quark
* @param ia The PDG code for the antiquark
* @return The external particles for the current.
*/
virtual tPDVector particles(int icharge, unsigned int imode, int iq, int ia);
//@}
/**
* Hadronic current. This version returns the hadronic current described above.
* @param imode The mode
* @param ichan The phase-space channel the current is needed for.
* @param scale The invariant mass of the particles in the current.
* @param decay The decay products
* @param meopt Option for the calculation of the matrix element
* @return The current.
*/
virtual vector<LorentzPolarizationVectorE>
current(const int imode, const int ichan,Energy & scale,
const ParticleVector & decay, DecayIntegrator::MEOption meopt) const;
/**
* Accept the decay. Checks that this is one of the allowed modes.
* @param id The id's of the particles in the current.
* @return Can this current have the external particles specified.
*/
virtual bool accept(vector<int> id);
/**
* Returns the decay mode number for a given set of particles in the current.
* @param id The id's of the particles in the current.
* @return The number of the mode
*/
virtual unsigned int decayMode(vector<int> id);
/**
* 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;
public:
/**
* Standard Init function used to initialize the interfaces.
*/
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 {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);}
//@}
private:
/**
* Describe a concrete class with no persistent data.
*/
static NoPIOClassDescription<LeptonNeutrinoCurrent> initLeptonNeutrinoCurrent;
/**
* Private and non-existent assignment operator.
*/
LeptonNeutrinoCurrent & operator=(const LeptonNeutrinoCurrent &);
};
}
#include "ThePEG/Utilities/ClassTraits.h"
namespace ThePEG {
/** @cond TRAITSPECIALIZATIONS */
/**
* The following template specialization informs ThePEG about the
* base class of LeptonNeutrinoCurrent.
*/
template <>
struct BaseClassTrait<Herwig::LeptonNeutrinoCurrent,1> {
/** Typedef of the base class of LeptonNeutrinoCurrent. */
typedef Herwig::WeakDecayCurrent NthBase;
};
/**
* The following template specialization informs ThePEG about the
* name of this class and the shared object where it is defined.
*/
template <>
struct ClassTraits<Herwig::LeptonNeutrinoCurrent>
: public ClassTraitsBase<Herwig::LeptonNeutrinoCurrent> {
/** Return the class name. */
static string className() { return "Herwig::LeptonNeutrinoCurrent"; }
/**
* Return the name of the shared library to be loaded to get
* access to this class and every other class it uses
* (except the base class).
*/
static string library() { return "HwWeakCurrents.so"; }
};
/** @endcond */
}
#endif /* HERWIG_LeptonNeutrinoCurrent_H */

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