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 28 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 46 of file EvtAngSam.cc.

{}

Member Function Documentation

clone()

EvtDecayBase * EvtAngSam::clone ( )

virtual

Implements EvtDecayBase.

Definition at line 54 of file EvtAngSam.cc.

                              {
 
  return new EvtAngSam;
 
}

decay()

void EvtAngSam::decay ( EvtParticle * p )

virtual

Implements EvtDecayBase.

Definition at line 81 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 48 of file EvtAngSam.cc.

                                            {
 
  model_name="AngSam";     
 
}

init()

void EvtAngSam::init ( )

virtual

Reimplemented from EvtDecayBase.

Definition at line 61 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 75 of file EvtAngSam.cc.

                           {
 
  noProbMax();
 
}

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

• EvtAngSam.hh
• EvtAngSam.cc