EvtAngSam Class Reference

#include <EvtAngSam.hh>

Inheritance diagram for EvtAngSam:

Public Member Functions
	EvtAngSam ()
virtual	~EvtAngSam ()
void	getName (std::string &name)
EvtDecayBase *	clone ()
void	initProbMax ()
void	init ()
void	decay (EvtParticle *p)
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 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 29 of file EvtAngSam.hh.

Constructor & Destructor Documentation

EvtAngSam()

EvtAngSam::EvtAngSam ( )

inline

Definition at line 32 of file EvtAngSam.hh.

{}

Referenced by clone().

~EvtAngSam()

EvtAngSam::~EvtAngSam ( )

virtual

Definition at line 47 of file EvtAngSam.cc.

{}

Member Function Documentation

clone()

EvtDecayBase * EvtAngSam::clone ( )

virtual

Implements EvtDecayBase.

Definition at line 51 of file EvtAngSam.cc.

{ return new EvtAngSam; }

decay()

void EvtAngSam::decay ( EvtParticle * p )

virtual

Implements EvtDecayBase.

Definition at line 71 of file EvtAngSam.cc.

                                      {
 
loop:
  p->initializePhaseSpace( getNDaug(), getDaugs() );
 
  EvtParticle *v, *s1;
  EvtVector4R  pv, ps, ppr;
 
  v   = p->getDaug( 0 ); // gamma
  s1  = p->getDaug( 1 ); // J/psi
  pv  = v->getP4();
  ps  = s1->getP4();
  ppr = p->getP4();
  //  Put phase space results into the daughters.
  EvtHelSys angles( ppr, pv ); // using helicity sys. angles
  double    theta = angles.getHelAng( 1 );
 
  // The angular form is: c0 + c2*cos^2(theta) + c4*cos^4(theta) + c6*cos^6(theta) +
  // c8*cos^8(theta) + c10*cos^10(theta) The parameters c0-c10 are specified by user in the
  // decay list
  int    narg = getNArg();
  double c0, c2, c4, c6, c8, c10;
  c0  = 0;
  c2  = 0;
  c4  = 0;
  c6  = 0;
  c8  = 0;
  c10 = 0;
  if ( narg == 2 )
  {
    c0 = getArg( 0 );
    c2 = getArg( 1 );
  }
  else if ( narg == 3 )
  {
    c0 = getArg( 0 );
    c2 = getArg( 1 );
    c4 = getArg( 2 );
  }
  else if ( narg == 4 )
  {
    c0 = getArg( 0 );
    c2 = getArg( 1 );
    c4 = getArg( 2 );
    c6 = getArg( 3 );
  }
  else if ( narg == 5 )
  {
    c0 = getArg( 0 );
    c2 = getArg( 1 );
    c4 = getArg( 2 );
    c6 = getArg( 3 );
    c8 = getArg( 4 );
  }
  else if ( narg == 6 )
  {
    c0  = getArg( 0 );
    c2  = getArg( 1 );
    c4  = getArg( 2 );
    c6  = getArg( 3 );
    c8  = getArg( 4 );
    c10 = getArg( 5 );
  }
 
  double costheta   = cos( theta );
  double costheta2  = costheta * costheta;
  double costheta4  = costheta2 * costheta2;
  double costheta6  = costheta4 * costheta2;
  double costheta8  = costheta6 * costheta2;
  double costheta10 = costheta8 * costheta2;
 
  double amp1 = ( c0 + c2 * costheta2 + c4 * costheta4 + c6 * costheta6 + c8 * costheta8 +
                  c10 * costheta10 );
  double a0, a2, a4, a6, a8, a10;
  double ampflag;
  if ( c0 < 0 ) { a0 = 0; }
  else { a0 = c0; }
  if ( c2 < 0 ) { a2 = 0; }
  else { a2 = c2; }
  if ( c4 < 0 ) { a4 = 0; }
  else { a4 = c4; }
  if ( c6 < 0 ) { a6 = 0; }
  else { a6 = c6; }
  if ( c8 < 0 ) { a8 = 0; }
  else { a8 = c8; }
  if ( c10 < 0 ) { a10 = 0; }
  else { a10 = c10; }
  ampflag = a0 + a2 + a4 + a6 + a8 + a10;
  if ( ampflag <= 0 )
  {
    report( ERROR, "EvtGen" )
        << " The maxium value of amplitude square should be positive, but it is " << ampflag
        << endl;
    ::abort();
  }
  ampflag    = amp1 / ampflag;
  double rd1 = EvtRandom::Flat( 0.0, 1.0 );
  if ( rd1 >= ampflag ) goto loop;
  return;
}

getName()

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

virtual

Implements EvtDecayBase.

Definition at line 49 of file EvtAngSam.cc.

{ model_name = "AngSam"; }

init()

void EvtAngSam::init ( )

virtual

Reimplemented from EvtDecayBase.

Definition at line 53 of file EvtAngSam.cc.

                     {
 
  // check that there are 1 arguments:angular distribution parameter
  checkNDaug( 2 );
  EvtSpinType::spintype parenttype = EvtPDL::getSpinType( getParentId() );
  //  if ( parenttype == EvtSpinType::SCALAR ){
  //  report(ERROR,"EvtGen")<<"Scalar decays with flat distribution"<<endl;
  //  ::abort();
  // }
  if ( getNArg() > 6 || getNArg() < 2 )
  {
    report( ERROR, "EvtGen" ) << " 2<= expected parameters <=6, but it is " << getNArg()
                              << endl;
    ::abort();
  }
}

initProbMax()

void EvtAngSam::initProbMax ( )

virtual

Reimplemented from EvtDecayBase.

Definition at line 69 of file EvtAngSam.cc.

{ noProbMax(); }

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

• EvtAngSam.hh
• EvtAngSam.cc