EvtJPE Class Reference

#include <EvtJPE.hh>

Inheritance diagram for EvtJPE:

Public Member Functions
	EvtJPE ()
virtual	~EvtJPE ()
void	getName (std::string &name)
EvtDecayBase *	clone ()
void	decay (EvtParticle *p)
void	init ()
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 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 EvtDecayAmp
EvtAmp	_amp2
Protected Attributes inherited from EvtDecayBase
bool	_daugsDecayedByParentModel

Detailed Description

Definition at line 28 of file EvtJPE.hh.

Constructor & Destructor Documentation

EvtJPE()

EvtJPE::EvtJPE ( )

inline

Definition at line 32 of file EvtJPE.hh.

{}

Referenced by clone().

~EvtJPE()

EvtJPE::~EvtJPE ( )

virtual

Definition at line 36 of file EvtJPE.cc.

{}

Member Function Documentation

clone()

EvtDecayBase * EvtJPE::clone ( )

virtual

Implements EvtDecayBase.

Definition at line 45 of file EvtJPE.cc.

                           {
 
  return new EvtJPE;
 
}

decay()

void EvtJPE::decay ( EvtParticle * p )

virtual

Implements EvtDecayBase.

Definition at line 75 of file EvtJPE.cc.

                                 {
 
  p->initializePhaseSpace(getNDaug(),getDaugs());
 
  EvtParticle *v,*s1;
  EvtVector4R pv,ps,ppr;
  
  v =p->getDaug(0);  //gamma
  s1=p->getDaug(1); //eta_c
  pv=v->getP4();
  ps=s1->getP4();
  ppr=p->getP4();
  EvtVector4R pvcm=v->getP4();
  
//  Put phase space results into the daughters.
  EvtHelSys angles(ppr,pv); //using helicity sys. angles
  double theta =angles.getHelAng(1); 
  double phi  =angles.getHelAng(2);
  double gamma=0;
 
  double mass_M = EvtPDL::getMass(getParentId());
  double Mpsip=fabs(mass_M-3.686);
  double Mpsipp=fabs(mass_M-3.771);
  double FP=pvcm.d3mag(); //for J/psi and psi(3770) decays, M1 transition  assumed with form factor =1. P-wave gives the p_gamma factor
  if(Mpsip<0.1) {FP=FP*FP;} else{FP=1;} //for psi(2S) decays, M1 transition assumed with form factor=k_gamma^2
 
 
  double FM=-FP;
 vertex(0,0,Djmn(1, 1, 1,phi,theta,gamma)*FP);  // Jpsi helicity =1 corresponding index=0
 vertex(0,1,Djmn(1, 1,-1,phi,theta,gamma)*FM);
 vertex(1,0,Djmn(1,-1, 1,phi,theta,gamma)*FP); // Jpsi helicity =-1 corresponding index=1 
 vertex(1,1,Djmn(1,-1,-1,phi,theta,gamma)*FM);
 vertex(2,0,Djmn(1, 0, 1,phi,theta,gamma)*FP); // Jpsi helicity =0 corresponding index=2
 vertex(2,1,Djmn(1, 0,-1,phi,theta,gamma)*FM);
 
 
  return ;
 
}

getName()

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

virtual

Implements EvtDecayBase.

Definition at line 38 of file EvtJPE.cc.

                                         {
 
  model_name="JPE";     
 
}

init()

void EvtJPE::init ( )

virtual

Reimplemented from EvtDecayBase.

Definition at line 51 of file EvtJPE.cc.

                 {
static EvtId GAM=EvtPDL::getId("gamma");
// check that there are 0 arguments
 checkNArg(0); 
 checkNDaug(2);
 checkSpinParent(EvtSpinType::VECTOR);
 checkSpinDaughter(0,EvtSpinType::PHOTON);
 checkSpinDaughter(1,EvtSpinType::SCALAR);
 if (!(getDaug(0)==GAM)) {
 report(ERROR,"EvtGen") << "EvtJPE generator radiative decays expected "<<endl;
 ::abort();
}
 }

---

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

• EvtJPE.hh
• EvtJPE.cc