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PScalarLeptonNeutrinoDecayer.h
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PScalarLeptonNeutrinoDecayer.h
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// -*- C++ -*-
#ifndef HERWIG_PScalarLeptonNeutrinoDecayer_H
#define HERWIG_PScalarLeptonNeutrinoDecayer_H
// This is the declaration of the PScalarLeptonNeutrinoDecayer class.
#include "Herwig++/Decay/DecayIntegrator.h"
#include "Herwig++/Decay/DecayPhaseSpaceMode.h"
#include "PScalarLeptonNeutrinoDecayer.fh"
namespace Herwig {
using namespace ThePEG;
/** \ingroup Decay
*
* The <code>PScalarLeptonNeutrinoDecayer</code> class is designed for the decay of
* pseudoscalar mesons to a lepton and a neutrino. Although it can be used
* for charged pion and kaon decays it is mainly intended for the leptonic
* decays of bottom and charm mesons.
*
* The matrix element is given by
* \f[\mathcal{M} = \frac1{\sqrt{2}}f_PG_FV_{CKM}m_l\bar{u}(p_{\ell})(1-\gamma_5)v(p_\nu),\f]
* where
* - \f$f_P\f$ is the pseudoscalar decay constant.
* - \f$G_F\f$ is the Fermi constant
* - \f$V_{CKM}\f$ is the relevant CKM matrix element
* - \f$p_\ell\f$ is the momentum of the charged lepton
* - \f$p_\nu\f$ is the momentum of the neutrino
*
* @see DecayIntegrator
*
*/
class PScalarLeptonNeutrinoDecayer: public DecayIntegrator {
public:
/** @name Standard constructors and destructors. */
//@{
/**
* Default constructor.
*/
PScalarLeptonNeutrinoDecayer();
/**
* Copy-constructor.
*/
inline PScalarLeptonNeutrinoDecayer(const PScalarLeptonNeutrinoDecayer &);
/**
* Destructor.
*/
virtual ~PScalarLeptonNeutrinoDecayer();
//@}
public:
/**
* Which of the possible decays is required
* @param cc Is this mode the charge conjugate
* @param dm The decay mode
*/
virtual int modeNumber(bool & cc,const DecayMode & dm) const;
/**
* Return the matrix element squared for a given mode and phase-space channel.
* @param vertex Output the information on the vertex for spin correlations
* @param ichan The channel we are calculating the matrix element for.
* @param part The decaying Particle.
* @param decay The particles produced in the decay.
* @return The matrix element squared for the phase-space configuration.
*/
double me2(bool vertex, const int ichan,const Particle & part,
const ParticleVector & decay) const;
/**
* 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
*/
virtual void dataBaseOutput(ofstream & os,bool header) const;
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();
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. */
//@{
/**
* Check sanity of the object during the setup phase.
*/
inline virtual void doupdate() throw(UpdateException);
/**
* 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() throw(InitException);
/**
* Initialize this object to the begining of the run phase.
*/
inline virtual void doinitrun();
/**
* Finalize this object. Called in the run phase just after a
* run has ended. Used eg. to write out statistics.
*/
inline virtual void dofinish();
/**
* Rebind pointer to other Interfaced objects. Called in the setup phase
* after all objects used in an EventGenerator has been cloned so that
* the pointers will refer to the cloned objects afterwards.
* @param trans a TranslationMap relating the original objects to
* their respective clones.
* @throws RebindException if no cloned object was found for a given pointer.
*/
inline virtual void rebind(const TranslationMap & trans)
throw(RebindException);
/**
* Return a vector of all pointers to Interfaced objects used in
* this object.
* @return a vector of pointers.
*/
inline virtual IVector getReferences();
//@}
private:
/**
* Describe a concrete class with persistent data.
*/
static ClassDescription<PScalarLeptonNeutrinoDecayer> initPScalarLeptonNeutrinoDecayer;
/**
* Private and non-existent assignment operator.
*/
PScalarLeptonNeutrinoDecayer & operator=(const PScalarLeptonNeutrinoDecayer &);
private:
/**
* the PDG code for the incoming particle
*/
vector<int> _incoming;
/**
* the meson decay constant for a particular particle multiplied by the CKM matrix
* element, \e i.e. \f$f_pV_{CKM}\f$
*/
vector<Energy> _decayconstant;
/**
* which outgoing leptons are allowed for a particular decay
*/
vector<unsigned int> _leptons;
/**
* the maximum weight for the integration of a given decay to \f$e\nu_e\f$.
*/
vector<double> _maxweighte;
/**
* the maximum weight for the integration of a given decay to \f$\mu\nu_\mu\f$.
*/
vector<double> _maxweightmu;
/**
* the maximum weight for the integration of a given decay to \f$\tau\nu_\tau\f$.
*/
vector<double> _maxweighttau;
/**
* the fermi constant
*/
InvEnergy2 _GF;
/**
* initial number of modes
*/
unsigned int _initsize;
};
}
#include "ThePEG/Utilities/ClassTraits.h"
namespace ThePEG {
template <>
/**
* The following template specialization informs ThePEG about the
* base class of PScalarLeptonNeutrinoDecayer.
*/
struct BaseClassTrait<Herwig::PScalarLeptonNeutrinoDecayer,1> {
/** Typedef of the base class of PScalarLeptonNeutrinoDecayer. */
typedef Herwig::DecayIntegrator 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::PScalarLeptonNeutrinoDecayer>
: public ClassTraitsBase<Herwig::PScalarLeptonNeutrinoDecayer> {
/** Return the class name.*/
static string className() { return "Herwig++::PScalarLeptonNeutrinoDecayer"; }
/**
* 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 HwSMDecay.so"; }
};
}
#include "PScalarLeptonNeutrinoDecayer.icc"
#ifndef ThePEG_TEMPLATES_IN_CC_FILE
// #include "PScalarLeptonNeutrinoDecayer.tcc"
#endif
#endif /* HERWIG_PScalarLeptonNeutrinoDecayer_H */

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