EvtPi0Dalitz Class Reference

#include <EvtPi0Dalitz.hh>

Inheritance diagram for EvtPi0Dalitz:

Public Member Functions
	EvtPi0Dalitz ()
virtual	~EvtPi0Dalitz ()
void	getName (std::string &name)
EvtDecayBase *	clone ()
void	init ()
void	initProbMax ()
void	decay (EvtParticle *p)
Public Member Functions inherited from EvtDecayProb
void	makeDecay (EvtParticle *p)
void	setProb (double prob)
double	getProb ()
void	setWeight (double weight)
virtual	~EvtDecayProb ()
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 EvtPi0Dalitz.hh.

Constructor & Destructor Documentation

EvtPi0Dalitz()

EvtPi0Dalitz::EvtPi0Dalitz ( )

inline

Definition at line 32 of file EvtPi0Dalitz.hh.

{}

Referenced by clone().

~EvtPi0Dalitz()

EvtPi0Dalitz::~EvtPi0Dalitz ( )

virtual

Definition at line 37 of file EvtPi0Dalitz.cc.

{}

Member Function Documentation

clone()

EvtDecayBase * EvtPi0Dalitz::clone ( )

virtual

Implements EvtDecayBase.

Definition at line 45 of file EvtPi0Dalitz.cc.

                                 {
 
  return new EvtPi0Dalitz;
 
}

decay()

void EvtPi0Dalitz::decay ( EvtParticle * p )

virtual

Implements EvtDecayBase.

Definition at line 75 of file EvtPi0Dalitz.cc.

                                       {
 
  EvtParticle *ep, *em, *gamma;
  setWeight(p->initializePhaseSpace(getNDaug(),getDaugs(),0.00000002,0,1));
 
  ep=p->getDaug(0);
  em=p->getDaug(1);
  gamma=p->getDaug(2);
 
  // the next four lines generates events with a weight such that
  // the efficiency for selecting them is good. The parameter below of
  // 0.1 is the size of the peak at low q^2 (in arbitrary units).
  // The value of 0.1 is appropriate for muons. 
  // when you use this remember to remove the cut on q^2!
   
 
  //ep em invariant mass^2
  double m2=(ep->getP4()+em->getP4()).mass2();
  EvtVector4R q=ep->getP4()+em->getP4();
  //Just use the prob summed over spins...
 
  EvtTensor4C w,v;
 
  v=2.0*(gamma->getP4()*q)*directProd(q,gamma->getP4()) 
    - (gamma->getP4()*q)*(gamma->getP4()*q)*EvtTensor4C::g()
    -m2*directProd(gamma->getP4(),gamma->getP4());
 
  w=4.0*( directProd(ep->getP4(),em->getP4()) + directProd(em->getP4(),ep->getP4())
       -EvtTensor4C::g()*(ep->getP4()*em->getP4()-ep->getP4().mass2()));
 
  double prob=(real(cont(v,w)))/(m2*m2);
  prob *=(1.0/( (0.768*0.768-m2)*(0.768*0.768-m2)
           +0.768*0.768*0.151*0.151));
 
  //  report(INFO,"EvtGen") << "prob is "<<prob<<endl;
  setProb(prob);
 
  return;
}

getName()

void EvtPi0Dalitz::getName ( std::string & name )

virtual

Implements EvtDecayBase.

Definition at line 39 of file EvtPi0Dalitz.cc.

                                               {
 
    model_name="PI0_DALITZ";
 
}

init()

void EvtPi0Dalitz::init ( )

virtual

Reimplemented from EvtDecayBase.

Definition at line 59 of file EvtPi0Dalitz.cc.

                       {
 
  // check that there are 0 arguments
  checkNArg(0);
  checkNDaug(3);
 
    
  checkSpinParent(EvtSpinType::SCALAR);
 
  checkSpinDaughter(0,EvtSpinType::DIRAC);
  checkSpinDaughter(1,EvtSpinType::DIRAC);
  checkSpinDaughter(2,EvtSpinType::PHOTON);
 
}

initProbMax()

void EvtPi0Dalitz::initProbMax ( )

virtual

Reimplemented from EvtDecayBase.

Definition at line 52 of file EvtPi0Dalitz.cc.

                              {
 
  setProbMax(3.5);
 
}

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

• EvtPi0Dalitz.hh
• EvtPi0Dalitz.cc