EvtSpinDensity.hh

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//--------------------------------------------------------------------------
//
// Environment:
//      This software is part of the EvtGen package developed jointly
//      for the BaBar and CLEO collaborations.  If you use all or part
//      of it, please give an appropriate acknowledgement.
//
// Copyright Information: See EvtGen/COPYRIGHT
//      Copyright (C) 1998      Caltech, UCSB
//
// Module: EvtGen/EvtSpinDensity.hh
//
// Description: This class holds a spin density matrix, it is
//              a complex nxn matrix.
//
// Modification history:
//
//    RYD     May 29, 1997         Module created
//
//------------------------------------------------------------------------
 
#ifndef EVTSPINDENSITY_HH
#define EVTSPINDENSITY_HH
#include "EvtComplex.hh"
 
class EvtSpinDensity {
 
public:
  EvtSpinDensity( const EvtSpinDensity& density );
  EvtSpinDensity& operator=( const EvtSpinDensity& density );
  virtual ~EvtSpinDensity();
 
  EvtSpinDensity();
  void                 SetDim( int n );
  int                  GetDim() const;
  void                 Set( int i, int j, const EvtComplex& rhoij );
  const EvtComplex&    Get( int i, int j ) const;
  double               NormalizedProb( const EvtSpinDensity& d );
  friend std::ostream& operator<<( std::ostream& s, const EvtSpinDensity& d );
  void                 SetDiag( int n );
 
  int Check();
 
private:
  EvtComplexPtrPtr rho;
  int              dim;
};
 
#endif