EvtMNode.hh

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#ifndef __EVTMNODE_HH__
#define __EVTMNODE_HH__
 
#include "EvtComplex.hh"
#include "EvtPDL.hh"
#include "EvtVector4R.hh"
 
#include "EvtSpinAmp.hh"
#include "EvtSymTable.hh"
 
#include <vector>
using std::vector;
 
#include <string>
using std::string;
 
class EvtMNode {
 
public:
  EvtMNode() {}
  virtual ~EvtMNode(){};
 
  // calculate the amplitude associated event this->children return a
  // vector of the form A_{\lambda this} and sum over allowed angular
  // momenta of the children
  virtual EvtSpinAmp amplitude( const vector<EvtVector4R>& product ) const = 0;
 
  // get the 4 vector associated with this node
  EvtVector4R get4vector( const vector<EvtVector4R>& product ) const;
 
  // get twice the spin of the particle
  int                   getspin() const { return _twospin; }
  EvtSpinType::spintype getspintype() const { return EvtPDL::getSpinType( _id ); }
 
  // get the id of this node
  EvtId getid() const { return _id; }
 
  // return which particles this is a combination of
  const vector<int>& getresonance() const { return _resonance; }
 
  void      setparent( EvtMNode* parent ) { _parent = parent; }
  EvtMNode* getparent() const { return _parent; }
 
  // get the number of children that this node has
  virtual int getnchild() const = 0;
 
  // return the value of the resonance shape
  virtual EvtComplex line( const vector<EvtVector4R>& product ) const = 0;
 
  // return a pointer node
  virtual EvtMNode* duplicate() const = 0;
 
protected:
  // store the EvtId of the particle (just in case we need it to access
  // further informatoin about it)
  EvtId _id;
 
  // store TWICE the spin of this resonance (this is to deal with spin 1/2
  int _twospin;
 
  // store the particles that form this resonance, this should match up
  // with the child nodes from below, and is calculated internally
  vector<int> _resonance;
 
  // store the parent node of this one
  EvtMNode* _parent;
};
 
#endif