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V2LeptonsCut.h
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V2LeptonsCut.h
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// -*- C++ -*-
//
// V2LeptonsCut.h is a part of ThePEG - Toolkit for HEP Event Generation
// Copyright (C) 1999-2011 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_V2LeptonsCut_H
#define THEPEG_V2LeptonsCut_H
//
// This is the declaration of the V2LeptonsCut class.
//
#include "ThePEG/Cuts/MultiCutBase.h"
namespace ThePEG {
/**
* This class inherits from MultiCutBase and describes cuts on the
* invariant mass of two final state leptons corresponding to the
* decay of a vector boson. It can be used when generating matrix
* elements to avoid the long tails of the resonance.
*
* @see \ref V2LeptonsCutInterfaces "The interfaces"
* defined for V2LeptonsCut.
*/
class V2LeptonsCut: public MultiCutBase {
/**
* Enumeration of the different families.
*/
enum Family {
electron = 1, /**< Lepton Family. */
muon = 2, /**< Muon Family. */
tau = 4 /**< Tau Family. */
};
/**
* Enumeration of charge combinations.
*/
enum CComb {
posneg = 1, /**< charged lepton anti-lepton pair. */
negneu = 2, /**< negative lepton anti-neutrino pair. */
posneu = 4, /**< positive lepton anti-neutrino pair. */
neuneu = 8 /**< neutrino anti-neutrino pair. */
};
public:
/** @name Standard constructors and destructors. */
//@{
/**
* The default constructor.
*/
V2LeptonsCut() : theMinM(70.0*GeV), theMaxM(90.0*GeV), theFamilies(electron|muon),
theCComb(negneu|posneu) {}
/**
* The destructor.
*/
virtual ~V2LeptonsCut();
//@}
public:
/** @name Overridden virtual functions defined in the base class. */
//@{
/**
* Return the minimum allowed value of the squared invariant mass of
* a set of outgoing partons of the given types. Typically used to
* cut off the tails of the mass of a resonance for efficiency.
*/
virtual Energy2 minS(const tcPDVector & pv) const;
/**
* Return the maximum allowed value of the squared invariant mass of
* a set of outgoing partons of the given types. Typically used to
* cut off the tails of the mass of a resonance for efficiency.
*/
virtual Energy2 maxS(const tcPDVector & pv) const;
/**
* Return true if a set of outgoing particles with typea \a ptype
* and corresponding momenta \a p passes the cuts.
*/
virtual bool passCuts(tcCutsPtr parent, const tcPDVector & ptype,
const vector<LorentzMomentum> & p) const;
//@}
/**
* Describe the currently active cuts in the log file.
*/
virtual void describe() const;
protected:
/**
* Check if the PDG id numbers matches this cut.
*/
bool checkTypes(long id1, long id2) const;
/**
* Check the family of the given PDG id number.
*/
int family(long id) 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);
//@}
/**
* 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;
//@}
private:
/**
* Helper function used by the interface.
*/
Energy maxMinM() const;
/**
* Helper function used by the interface.
*/
Energy minMaxM() const;
private:
/**
* The minimum invariant mass.
*/
Energy theMinM;
/**
* The maximum invariant mass.
*/
Energy theMaxM;
/**
* Integer corresponding to the lepton families to match.
*/
int theFamilies;
/**
* Integer corresponding to the charge combination to match.
*/
int theCComb;
private:
/**
* The static object used to initialize the description of this class.
* Indicates that this is a concrete class with persistent data.
*/
static ClassDescription<V2LeptonsCut> initV2LeptonsCut;
/**
* The assignment operator is private and must never be called.
* In fact, it should not even be implemented.
*/
V2LeptonsCut & operator=(const V2LeptonsCut &);
};
}
#include "ThePEG/Utilities/ClassTraits.h"
namespace ThePEG {
/** @cond TRAITSPECIALIZATIONS */
/** This template specialization informs ThePEG about the
* base classes of V2LeptonsCut. */
template <>
struct BaseClassTrait<V2LeptonsCut,1> {
/** Typedef of the first base class of V2LeptonsCut. */
typedef MultiCutBase NthBase;
};
/** This template specialization informs ThePEG about the name of
* the V2LeptonsCut class and the shared object where it is defined. */
template <>
struct ClassTraits<V2LeptonsCut>
: public ClassTraitsBase<V2LeptonsCut> {
/** Return a platform-independent class name */
static string className() { return "ThePEG::V2LeptonsCut"; }
/** Return the name of the shared library be loaded to get
* access to the V2LeptonsCut class and every other class it uses
* (except the base class). */
static string library() { return "V2LeptonsCut.so"; }
};
/** @endcond */
}
#endif /* THEPEG_V2LeptonsCut_H */

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