EvtHelAmp Class Reference

#include <EvtHelAmp.hh>

Inheritance diagram for EvtHelAmp:

Public Member Functions
	EvtHelAmp ()
virtual	~EvtHelAmp ()
void	getName (std::string &name)
EvtDecayBase *	clone ()
void	init ()
void	initProbMax ()
void	decay (EvtParticle *p)
Public Member Functions inherited from EvtDecayAmp
void	makeDecay (EvtParticle *p)
void	setWeight (double weight)
void	vertex (const EvtComplex &amp)
void	vertex (int i1, const EvtComplex &amp)
void	vertex (int i1, int i2, const EvtComplex &amp)
void	vertex (int i1, int i2, int i3, const EvtComplex &amp)
void	vertex (int *i1, const EvtComplex &amp)
virtual	~EvtDecayAmp ()
Public Member Functions inherited from EvtDecayBase
virtual std::string	commandName ()
virtual void	command (std::string cmd)
double	getProbMax (double prob)
double	resetProbMax (double prob)
	EvtDecayBase ()
virtual	~EvtDecayBase ()
virtual bool	matchingDecay (const EvtDecayBase &other) const
EvtId	getParentId ()
double	getBranchingFraction ()
void	disableCheckQ ()
void	checkQ ()
int	getNDaug ()
EvtId *	getDaugs ()
EvtId	getDaug (int i)
int	getNArg ()
int	getPHOTOS ()
void	setPHOTOS ()
void	setVerbose ()
void	setSummary ()
double *	getArgs ()
std::string *	getArgsStr ()
double	getArg (int j)
std::string	getArgStr (int j)
std::string	getModelName ()
int	getDSum ()
int	summary ()
int	verbose ()
void	saveDecayInfo (EvtId ipar, int ndaug, EvtId *daug, int narg, std::vector< std::string > &args, std::string name, double brfr)
void	printSummary ()
void	setProbMax (double prbmx)
void	noProbMax ()
void	checkNArg (int a1, int a2=-1, int a3=-1, int a4=-1)
void	checkNDaug (int d1, int d2=-1)
void	checkSpinParent (EvtSpinType::spintype sp)
void	checkSpinDaughter (int d1, EvtSpinType::spintype sp)
virtual int	nRealDaughters ()

Additional Inherited Members
Static Public Member Functions inherited from EvtDecayBase
static void	findMasses (EvtParticle *p, int ndaugs, EvtId daugs[10], double masses[10])
static void	findMass (EvtParticle *p)
static double	findMaxMass (EvtParticle *p)
Protected Member Functions inherited from EvtDecayBase
bool	daugsDecayedByParentModel ()
Protected Attributes inherited from EvtDecayAmp
EvtAmp	_amp2
Protected Attributes inherited from EvtDecayBase
bool	_daugsDecayedByParentModel

Detailed Description

Definition at line 35 of file EvtHelAmp.hh.

Constructor & Destructor Documentation

EvtHelAmp()

EvtHelAmp::EvtHelAmp ( )

inline

Definition at line 38 of file EvtHelAmp.hh.

{}

Referenced by clone().

~EvtHelAmp()

EvtHelAmp::~EvtHelAmp ( )

virtual

Definition at line 36 of file EvtHelAmp.cc.

{ delete _evalHelAmp; }

Member Function Documentation

clone()

EvtDecayBase * EvtHelAmp::clone ( )

virtual

Implements EvtDecayBase.

Definition at line 40 of file EvtHelAmp.cc.

{ return new EvtHelAmp; }

decay()

void EvtHelAmp::decay ( EvtParticle * p )

virtual

Implements EvtDecayBase.

Definition at line 149 of file EvtHelAmp.cc.

                                      {
 
  // first generate simple phase space
  p->initializePhaseSpace( getNDaug(), getDaugs() );
 
  _evalHelAmp->evalAmp( p, _amp2 );
 
  return;
}

getName()

void EvtHelAmp::getName ( std::string & name )

virtual

Implements EvtDecayBase.

Definition at line 38 of file EvtHelAmp.cc.

{ model_name = "HELAMP"; }

init()

void EvtHelAmp::init ( )

virtual

Reimplemented from EvtDecayBase.

Definition at line 42 of file EvtHelAmp.cc.

                     {
 
  checkNDaug( 2 );
 
  // find out how many states each particle have
  int _nA = EvtSpinType::getSpinStates( EvtPDL::getSpinType( getParentId() ) );
  int _nB = EvtSpinType::getSpinStates( EvtPDL::getSpinType( getDaug( 0 ) ) );
  int _nC = EvtSpinType::getSpinStates( EvtPDL::getSpinType( getDaug( 1 ) ) );
 
  if ( verbose() )
  { report( INFO, "EvtGen" ) << "_nA,_nB,_nC:" << _nA << "," << _nB << "," << _nC << endl; }
 
  // find out what 2 times the spin is
  int _JA2 = EvtSpinType::getSpin2( EvtPDL::getSpinType( getParentId() ) );
  int _JB2 = EvtSpinType::getSpin2( EvtPDL::getSpinType( getDaug( 0 ) ) );
  int _JC2 = EvtSpinType::getSpin2( EvtPDL::getSpinType( getDaug( 1 ) ) );
 
  if ( verbose() )
  {
    report( INFO, "EvtGen" ) << "_JA2,_JB2,_JC2:" << _JA2 << "," << _JB2 << "," << _JC2
                             << endl;
  }
 
  // allocate memory
  int* _lambdaA2 = new int[_nA];
  int* _lambdaB2 = new int[_nB];
  int* _lambdaC2 = new int[_nC];
 
  EvtComplexPtr* _HBC = new EvtComplexPtr[_nB];
  int            ib, ic;
  for ( ib = 0; ib < _nB; ib++ ) { _HBC[ib] = new EvtComplex[_nC]; }
 
  int i;
  // find the allowed helicities (actually 2*times the helicity!)
  fillHelicity( _lambdaA2, _nA, _JA2, getParentId() );
  fillHelicity( _lambdaB2, _nB, _JB2, getDaug( 0 ) );
  fillHelicity( _lambdaC2, _nC, _JC2, getDaug( 1 ) );
 
  if ( verbose() )
  {
    report( INFO, "EvtGen" ) << "Helicity states of particle A:" << endl;
    for ( i = 0; i < _nA; i++ ) { report( INFO, "EvtGen" ) << _lambdaA2[i] << endl; }
 
    report( INFO, "EvtGen" ) << "Helicity states of particle B:" << endl;
    for ( i = 0; i < _nB; i++ ) { report( INFO, "EvtGen" ) << _lambdaB2[i] << endl; }
 
    report( INFO, "EvtGen" ) << "Helicity states of particle C:" << endl;
    for ( i = 0; i < _nC; i++ ) { report( INFO, "EvtGen" ) << _lambdaC2[i] << endl; }
  }
 
  // now read in the helicity amplitudes
 
  int argcounter = 0;
 
  for ( ib = 0; ib < _nB; ib++ )
  {
    for ( ic = 0; ic < _nC; ic++ )
    {
      _HBC[ib][ic] = 0.0;
      if ( abs( _lambdaB2[ib] - _lambdaC2[ic] ) <= _JA2 ) argcounter += 2;
    }
  }
 
  checkNArg( argcounter );
 
  argcounter = 0;
 
  for ( ib = 0; ib < _nB; ib++ )
  {
    for ( ic = 0; ic < _nC; ic++ )
    {
      if ( abs( _lambdaB2[ib] - _lambdaC2[ic] ) <= _JA2 )
      {
        _HBC[ib][ic] =
            getArg( argcounter ) * exp( EvtComplex( 0.0, getArg( argcounter + 1 ) ) );
        ;
        argcounter += 2;
        if ( verbose() )
        {
          report( INFO, "EvtGen" )
              << "_HBC[" << ib << "][" << ic << "]=" << _HBC[ib][ic] << endl;
        }
      }
    }
  }
 
  _evalHelAmp = new EvtEvalHelAmp( EvtPDL::getSpinType( getParentId() ),
                                   EvtPDL::getSpinType( getDaug( 0 ) ),
                                   EvtPDL::getSpinType( getDaug( 1 ) ), _HBC );
 
  // Note: these are not class data members but local variables.
  delete[] _lambdaA2;
  delete[] _lambdaB2;
  delete[] _lambdaC2;
  for ( int ib = 0; ib < _nB; ib++ ) { delete[] _HBC[ib]; }
  delete[] _HBC; // _HBC is copied in ctor of EvtEvalHelAmp above.
}

initProbMax()

void EvtHelAmp::initProbMax ( )

virtual

Reimplemented from EvtDecayBase.

Definition at line 140 of file EvtHelAmp.cc.

                            {
 
  double maxprob = _evalHelAmp->probMax();
 
  if ( verbose() ) { report( INFO, "EvtGen" ) << "Calculated probmax" << maxprob << endl; }
 
  setProbMax( maxprob );
}

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The documentation for this class was generated from the following files:

• EvtHelAmp.hh
• EvtHelAmp.cc