EvtSingleParticle Class Reference

#include <EvtSingleParticle.hh>

Inheritance diagram for EvtSingleParticle:

Public Member Functions
	EvtSingleParticle ()
virtual	~EvtSingleParticle ()
void	getName (std::string &name)
EvtDecayBase *	clone ()
void	decay (EvtParticle *p)
void	init ()
Public Member Functions inherited from EvtDecayIncoherent
void	makeDecay (EvtParticle *p)
virtual	~EvtDecayIncoherent ()
void	setDaughterSpinDensity (int daughter)
int	isDaughterSpinDensitySet (int daughter)
Public Member Functions inherited from EvtDecayBase
virtual void	initProbMax ()
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 EvtDecayBase
bool	_daugsDecayedByParentModel

Detailed Description

Definition at line 28 of file EvtSingleParticle.hh.

Constructor & Destructor Documentation

EvtSingleParticle()

EvtSingleParticle::EvtSingleParticle ( )

inline

Definition at line 31 of file EvtSingleParticle.hh.

{}

Referenced by clone().

~EvtSingleParticle()

EvtSingleParticle::~EvtSingleParticle ( )

virtual

Definition at line 32 of file EvtSingleParticle.cc.

{}

Member Function Documentation

clone()

EvtDecayBase * EvtSingleParticle::clone ( )

virtual

Implements EvtDecayBase.

Definition at line 36 of file EvtSingleParticle.cc.

{ return new EvtSingleParticle(); }

decay()

void EvtSingleParticle::decay ( EvtParticle * p )

virtual

Implements EvtDecayBase.

Definition at line 103 of file EvtSingleParticle.cc.

                                              {
 
  EvtParticle* d;
  EvtVector4R  p4;
 
  double mass = EvtPDL::getMass( getDaug( 0 ) );
 
  p->makeDaughters( getNDaug(), getDaugs() );
  d = p->getDaug( 0 );
 
  // generate flat distribution in p
  // we are now in the parents restframe! This means the
  // restframe of the e+e- collison.
  double pcm;
  if ( pmin == pmax ) pcm = pmin; // pingrg, 2008-04-15
  if ( pmin < pmax ) pcm = EvtRandom::Flat( pmin, pmax );
 
  // generate flat distribution in phi.
  double phi;
  if ( phimin == phimax ) phi = phimin; // pingrg 2008-10-22
  else phi = EvtRandom::Flat( phimin, phimax );
 
  double cthetalab;
 
  do {
    // generate flat distribution in costheta
    double ctheta;
    if ( cthetamin == cthetamax ) ctheta = cthetamin;
    else ctheta = EvtRandom::Flat( cthetamin, cthetamax );
    double stheta = sqrt( 1.0 - ctheta * ctheta );
    p4.set( sqrt( mass * mass + pcm * pcm ), pcm * cos( phi ) * stheta,
            pcm * sin( phi ) * stheta, pcm * ctheta );
 
    d->init( getDaug( 0 ), p4 );
 
    // get 4 vector in the lab frame!
    EvtVector4R p4lab = d->getP4Lab();
    cthetalab         = p4lab.get( 3 ) / p4lab.d3mag();
  } while ( cthetalab > cthetamax || cthetalab < cthetamin );
 
  return;
}

getName()

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

virtual

Implements EvtDecayBase.

Definition at line 34 of file EvtSingleParticle.cc.

{ model_name = "SINGLE"; }

init()

void EvtSingleParticle::init ( )

virtual

Reimplemented from EvtDecayBase.

Definition at line 38 of file EvtSingleParticle.cc.

                             {
 
  // turn off checks for charge conservation
  disableCheckQ();
 
  if ( ( getNArg() == 6 ) || ( getNArg() == 4 ) || ( getNArg() == 2 ) )
  {
 
    if ( getNArg() == 6 )
    {
      // copy the arguments into eaiser to remember names!
 
      pmin = getArg( 0 );
      pmax = getArg( 1 );
 
      cthetamin = getArg( 2 );
      cthetamax = getArg( 3 );
 
      phimin = getArg( 4 );
      phimax = getArg( 5 );
    }
 
    if ( getNArg() == 4 )
    {
      // copy the arguments into eaiser to remember names!
 
      pmin = getArg( 0 );
      pmax = getArg( 1 );
 
      cthetamin = getArg( 2 );
      cthetamax = getArg( 3 );
 
      phimin = 0.0;
      phimax = EvtConst::twoPi;
    }
 
    if ( getNArg() == 2 )
    {
      // copy the arguments into eaiser to remember names!
 
      pmin = getArg( 0 );
      pmax = getArg( 1 );
 
      cthetamin = -1.0;
      cthetamax = 1.0;
 
      phimin = 0.0;
      phimax = EvtConst::twoPi;
    }
  }
  else
  {
 
    report( ERROR, "EvtGen" ) << "EvtSingleParticle generator expected "
                              << " 6, 4, or 2 arguments but found:" << getNArg() << endl;
    report( ERROR, "EvtGen" ) << "Will terminate execution!" << endl;
    ::abort();
  }
 
  report( INFO, "EvtGen" ) << "The single particle generator has been configured:" << endl;
  report( INFO, "EvtGen" ) << pmax << " > p > " << pmin << endl;
  report( INFO, "EvtGen" ) << cthetamax << " > costheta > " << cthetamin << endl;
  report( INFO, "EvtGen" ) << phimax << " > phi > " << phimin << endl;
}

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

• EvtSingleParticle.hh
• EvtSingleParticle.cc