EvtJ2BB1 Class Reference

#include <EvtJ2BB1.hh>

Inheritance diagram for EvtJ2BB1:

Public Member Functions
	EvtJ2BB1 ()
virtual	~EvtJ2BB1 ()
void	getName (std::string &name)
EvtDecayBase *	clone ()
void	decay (EvtParticle *p)
void	init ()
void	init (int, double *)
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	getName (std::string &name)=0
virtual void	decay (EvtParticle *p)=0
virtual void	makeDecay (EvtParticle *p)=0
virtual EvtDecayBase *	clone ()=0
virtual void	init ()
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 ()

Public Attributes
double	alpha
double	u

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 29 of file EvtJ2BB1.hh.

Constructor & Destructor Documentation

EvtJ2BB1()

EvtJ2BB1::EvtJ2BB1 ( )

inline

Definition at line 33 of file EvtJ2BB1.hh.

{}

Referenced by clone().

~EvtJ2BB1()

EvtJ2BB1::~EvtJ2BB1 ( )

virtual

Definition at line 36 of file EvtJ2BB1.cc.

{}

Member Function Documentation

clone()

EvtDecayBase * EvtJ2BB1::clone ( )

virtual

Implements EvtDecayBase.

Definition at line 45 of file EvtJ2BB1.cc.

                             {
 
  return new EvtJ2BB1;
 
}

decay()

void EvtJ2BB1::decay ( EvtParticle *  p )

virtual

Implements EvtDecayBase.

Definition at line 65 of file EvtJ2BB1.cc.

                                   {
  
  p->initializePhaseSpace(getNDaug(),getDaugs());
  
  EvtParticle *v,*s1;
  EvtVector4R pv,ps,ppr;
 
  v =p->getDaug(0);  //Baryon
  s1=p->getDaug(1); //Baryon
  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);
  double phi  =angles.getHelAng(2);
  double gamma=0;
  double costheta=cos(theta);  //using helicity angles in parent system
//  double costheta=ppr.get(3)/ppr.d3mag();  //using Lab system 
 
  if(getNArg()>0){ alpha=getArg(0);}
   else{double mass_b1 = EvtPDL::getMass(getDaug(0));
        double mass_b2 = EvtPDL::getMass(getDaug(1));
        double mass_M = EvtPDL::getMass(getParentId());
        double c1=pow(pv.d3mag(),2.0);
        double R=(mass_b1+pv.get(0))*(mass_b2+ps.get(0));
        u=pow((R-c1)/(R+c1),2.0); 
        alpha=(pow(4+u,2.0)-u*pow(2+3*u,2.0))/(pow(4+u,2.0)+u*pow(2+3*u,2.0));}
 
  double F01=sqrt((1+alpha)/2);
  double F00=sqrt((1-alpha)/4);
  double F10=F01;
  double F11=F00;
 
 vertex(0,0,0,Djmn(1, 1, 0,phi,theta,gamma)*F00);  // J/psi helicity =1 corresponding index=0
 vertex(0,0,1,Djmn(1, 1, 1,phi,theta,gamma)*F01);
 vertex(0,1,0,Djmn(1, 1,-1,phi,theta,gamma)*F10); 
 vertex(0,1,1,Djmn(1, 1, 0,phi,theta,gamma)*F11);
 vertex(1,0,0,Djmn(1,-1, 0,phi,theta,gamma)*F00);  // J/psi helicity =-1 corresponding index=1
 vertex(1,0,1,Djmn(1,-1, 1,phi,theta,gamma)*F01); 
 vertex(1,1,0,Djmn(1,-1,-1,phi,theta,gamma)*F10);
 vertex(1,1,1,Djmn(1,-1, 0,phi,theta,gamma)*F11); 
 vertex(2,0,0,Djmn(1, 0, 0,phi,theta,gamma)*F00);  // J/psi helicity =0 corresponding index=2
 vertex(2,0,1,Djmn(1, 0, 1,phi,theta,gamma)*F01);
 vertex(2,1,0,Djmn(1, 0,-1,phi,theta,gamma)*F10);
 vertex(2,1,1,Djmn(1, 0, 0,phi,theta,gamma)*F11);
 
 
  return ;
 
}

getName()

void EvtJ2BB1::getName ( std::string &  name )

virtual

Implements EvtDecayBase.

Definition at line 38 of file EvtJ2BB1.cc.

                                           {
 
  model_name="J2BB1";     
 
}

init() [1/2]

void EvtJ2BB1::init ( )

virtual

Reimplemented from EvtDecayBase.

Definition at line 58 of file EvtJ2BB1.cc.

                   {
 checkNDaug(2);
 checkSpinParent(EvtSpinType::VECTOR);
 checkSpinDaughter(0,EvtSpinType::DIRAC);
 checkSpinDaughter(1,EvtSpinType::DIRAC);
}

init() [2/2]

void EvtJ2BB1::init	(	int	,
		double *
	)

Member Data Documentation

alpha

double EvtJ2BB1::alpha

Definition at line 44 of file EvtJ2BB1.hh.

Referenced by decay().

u

double EvtJ2BB1::u

Definition at line 45 of file EvtJ2BB1.hh.

Referenced by decay().

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

• EvtJ2BB1.hh
• EvtJ2BB1.cc