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 31 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 40 of file EvtJPE.cc.

{ return new EvtJPE; }

decay()

void EvtJPE::decay ( EvtParticle * p )

virtual

Implements EvtDecayBase.

Definition at line 66 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 42 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();
  }
}

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

• EvtJPE.hh
• EvtJPE.cc