EvtRexc Class Reference

#include <EvtRexc.hh>

Inheritance diagram for EvtRexc:

Public Member Functions
	EvtRexc ()
virtual	~EvtRexc ()
void	getName (std::string &name)
EvtDecayBase *	clone ()
void	initProbMax ()
void	init ()
void	decay (EvtParticle *p)
double	baryonAng (double mx)
bool	angularSampling (EvtParticle *par)
bool	hadron_angle_sampling (EvtVector4R ppi, EvtVector4R pcm)
bool	meson_sampling (EvtVector4R pcm, EvtVector4R pi)
bool	VP_sampling (EvtVector4R pcm, EvtVector4R pi)
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 19 of file EvtRexc.hh.

Constructor & Destructor Documentation

EvtRexc()

EvtRexc::EvtRexc ( )

inline

Definition at line 23 of file EvtRexc.hh.

{}

Referenced by clone().

~EvtRexc()

EvtRexc::~EvtRexc ( )

virtual

Definition at line 22 of file EvtRexc.cc.

{}

Member Function Documentation

angularSampling()

bool EvtRexc::angularSampling

(

EvtParticle *

par

)

Definition at line 89 of file EvtRexc.cc.

                                             {
  bool tagp,tagk;
  tagk=0;
  tagp=0;
  int nds = par->getNDaug();
  for(int i=0;i<par->getNDaug();i++){
    EvtId di=par->getDaug(i)->getId();
    EvtVector4R p4i = par->getDaug(i)->getP4Lab();
    int pdgcode =EvtPDL::getStdHep( di );
    double alpha=1;
    double angmax = 1+alpha;
    double costheta = cos(p4i.theta());
    double ang=1+alpha*costheta*costheta;
    double xratio = ang/angmax;
    double xi=EvtRandom::Flat(0.,1);
    //std::cout<<"pdgcode "<<pdgcode<<std::endl;
    //std::cout<<ang<<" "<<angmax<<" "<<xi<<" "<<xratio<<std::endl;
    if(xi>xratio) return false;
  }//loop over duaghters
  return true;
}

Referenced by decay().

baryonAng()

double EvtRexc::baryonAng

(

double

mx

)

Definition at line 111 of file EvtRexc.cc.

                                  {
  double mp=0.938;
  double u = 0.938/mx;
  u = u*u;
  double u2 = (1+u)*(1+u);
  double uu = u*(1+6*u);
  double alpha = (u2-uu)/(u2+uu);
  return alpha;
}

clone()

EvtDecayBase * EvtRexc::clone ( )

virtual

Implements EvtDecayBase.

Definition at line 30 of file EvtRexc.cc.

                            {
 
  return new EvtRexc;
 
}

decay()

void EvtRexc::decay ( EvtParticle * p )

virtual

Implements EvtDecayBase.

Definition at line 50 of file EvtRexc.cc.

                                   {
  double mhds = p->mass();
  int mymode = EvtConExc::conexcmode;
  myconexc->init_mode(mymode);
  //std::cout<<"EvtRexc:: A selected mode is "<<mymode<<" with Mhds= "<<mhds<<std::endl; //debugging
  int _ndaugs = myconexc->getNdaugs();
  EvtId *daugs=myconexc->getDaugId();
  //debugging
  /*
  std::cout<<"Ndaugs= "<<_ndaugs<<std::endl;
  for(int i=0;i<_ndaugs;i++){
    std::cout<<i<<" "<<EvtPDL::getStdHep(daugs[i])<<std::endl;
  }
  */
 Loop:
  double totmass=0;
  p->makeDaughters(_ndaugs,daugs);
  for(int i=0;i< _ndaugs;i++){  
    EvtParticle* di=p->getDaug(i);
    double xmi=EvtPDL::getMass(di->getId());
    di->setMass(xmi);
    totmass += xmi;
  }
  if(totmass > p->mass()) goto Loop;
 
  double weight = p->initializePhaseSpace( _ndaugs , daugs);
  //  std::cout<<"weight= "<<weight<<std::endl;
  if( EvtConExc::multimode==1 && _ndaugs==2){
    _daugs[0]=daugs[0];
    _daugs[1]=daugs[1];
    EvtVector4R pd1 = p->getDaug(0)->getP4(); 
    double _cms=EvtPDL::getMass(p->getId());
    EvtVector4R pcm(_cms,0,0,0);
    bool bang=hadron_angle_sampling(pd1,pcm);
    if(!bang) goto Loop;
  }else if( (2.5< mhds && mhds<3.092 || mhds>3.1012) && !angularSampling(p)) goto Loop;
  return ;
}

getName()

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

virtual

Implements EvtDecayBase.

Definition at line 24 of file EvtRexc.cc.

                                          {
 
  model_name="REXC"; //R-scan exclusive decay model    
 
}

hadron_angle_sampling()

bool EvtRexc::hadron_angle_sampling	(	EvtVector4R	ppi,
		EvtVector4R	pcm )

Definition at line 121 of file EvtRexc.cc.

                                                                   {
  EvtVector4R pbst=-1*pcm;
  pbst.set(0,pcm.get(0));
  EvtVector4R p4i = boostTo(ppi,pbst);
    EvtSpinType::spintype type0 = EvtPDL::getSpinType(_daugs[0]);
    EvtSpinType::spintype type1 = EvtPDL::getSpinType(_daugs[1]);
    if(type0==EvtSpinType::SCALAR &&type1==EvtSpinType::SCALAR ){
    bool msn_ang = meson_sampling(pcm,p4i);
    return msn_ang;
    }else if(type0==EvtSpinType::VECTOR &&type1==EvtSpinType::SCALAR || type1==EvtSpinType::VECTOR &&type0==EvtSpinType::SCALAR ){
    bool msn_ang = VP_sampling(pcm,p4i);
    return msn_ang;
   }
  return true;
}

Referenced by decay().

init()

void EvtRexc::init ( )

virtual

Reimplemented from EvtDecayBase.

Definition at line 37 of file EvtRexc.cc.

                  {
 
  // check that there are 0 arguments
  checkNArg(0);
  myconexc = new EvtConExc();
}

initProbMax()

void EvtRexc::initProbMax ( )

virtual

Reimplemented from EvtDecayBase.

Definition at line 44 of file EvtRexc.cc.

                         {
 
  noProbMax();
 
}

meson_sampling()

bool EvtRexc::meson_sampling	(	EvtVector4R	pcm,
		EvtVector4R	pi )

Definition at line 137 of file EvtRexc.cc.

                                                           {
  EvtHelSys angles(pcm,pi);   //using helicity sys.angles
  double theta=angles.getHelAng(1);
  double phi  =angles.getHelAng(2);
  double costheta=cos(theta);  //using helicity angles in parent system
 
  double pm= EvtRandom::Flat(0.,1);
  double ang = 1 - costheta*costheta;
  if(pm< ang/1.) {return true;}else{return false;}
}

Referenced by hadron_angle_sampling().

VP_sampling()

bool EvtRexc::VP_sampling	(	EvtVector4R	pcm,
		EvtVector4R	pi )

Definition at line 148 of file EvtRexc.cc.

                                                        {
  EvtHelSys angles(pcm,pi);   //using helicity sys.angles
  double theta=angles.getHelAng(1);
  double phi  =angles.getHelAng(2);
  double costheta=cos(theta);  //using helicity angles in parent system
 
  double pm= EvtRandom::Flat(0.,1);
  double ang = 1 + costheta*costheta;
  if(pm< ang/2.) {return true;}else{return false;}
}

Referenced by hadron_angle_sampling().

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

• EvtRexc.hh
• EvtRexc.cc