EvtTauHadnu Class Reference

#include <EvtTauHadnu.hh>

Inheritance diagram for EvtTauHadnu:

Public Member Functions
	EvtTauHadnu ()
virtual	~EvtTauHadnu ()
void	getName (std::string &name)
EvtDecayBase *	clone ()
void	initProbMax ()
void	init ()
void	decay (EvtParticle *p)
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 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 EvtTauHadnu.hh.

Constructor & Destructor Documentation

EvtTauHadnu()

EvtTauHadnu::EvtTauHadnu ( )

inline

Definition at line 31 of file EvtTauHadnu.hh.

{}

Referenced by clone().

~EvtTauHadnu()

EvtTauHadnu::~EvtTauHadnu ( )

virtual

Definition at line 36 of file EvtTauHadnu.cc.

{}

Member Function Documentation

clone()

EvtDecayBase * EvtTauHadnu::clone ( )

virtual

Implements EvtDecayBase.

Definition at line 40 of file EvtTauHadnu.cc.

{ return new EvtTauHadnu; }

decay()

void EvtTauHadnu::decay ( EvtParticle * p )

virtual

Implements EvtDecayBase.

Definition at line 106 of file EvtTauHadnu.cc.

                                        {
 
  static EvtId TAUM = EvtPDL::getId( "tau-" );
 
  EvtIdSet thePis( "pi+", "pi-", "pi0" );
  EvtIdSet theKs( "K+", "K-" );
 
  p->initializePhaseSpace( getNDaug(), getDaugs() );
 
  EvtParticle* nut;
  nut = p->getDaug( getNDaug() - 1 );
 
  // get the leptonic current
  EvtVector4C tau1, tau2;
 
  if ( p->getId() == TAUM )
  {
    tau1 = EvtLeptonVACurrent( nut->spParentNeutrino(), p->sp( 0 ) );
    tau2 = EvtLeptonVACurrent( nut->spParentNeutrino(), p->sp( 1 ) );
  }
  else
  {
    tau1 = EvtLeptonVACurrent( p->sp( 0 ), nut->spParentNeutrino() );
    tau2 = EvtLeptonVACurrent( p->sp( 1 ), nut->spParentNeutrino() );
  }
 
  EvtVector4C hadCurr;
  bool        foundHadCurr = false;
  if ( getNDaug() == 2 )
  {
    hadCurr      = p->getDaug( 0 )->getP4();
    foundHadCurr = true;
  }
  if ( getNDaug() == 3 )
  {
 
    // pi pi nu with rho and rhopr resonance
    if ( thePis.contains( getDaug( 0 ) ) && thePis.contains( getDaug( 1 ) ) )
    {
 
      EvtVector4R q1 = p->getDaug( 0 )->getP4();
      EvtVector4R q2 = p->getDaug( 1 )->getP4();
 
      hadCurr = Fpi( q1, q2 ) * ( q1 - q2 );
 
      foundHadCurr = true;
    }
  }
  if ( getNDaug() == 4 )
  {
    if ( thePis.contains( getDaug( 0 ) ) && thePis.contains( getDaug( 1 ) ) &&
         thePis.contains( getDaug( 2 ) ) )
    {
      foundHadCurr = true;
      // figure out which is the different charged pi
      // want it to be q3
 
      int diffPi( 0 ), samePi1( 0 ), samePi2( 0 );
      if ( getDaug( 0 ) == getDaug( 1 ) )
      {
        diffPi  = 2;
        samePi1 = 0;
        samePi2 = 1;
      }
      if ( getDaug( 0 ) == getDaug( 2 ) )
      {
        diffPi  = 1;
        samePi1 = 0;
        samePi2 = 2;
      }
      if ( getDaug( 1 ) == getDaug( 2 ) )
      {
        diffPi  = 0;
        samePi1 = 1;
        samePi2 = 2;
      }
 
      EvtVector4R q1 = p->getDaug( samePi1 )->getP4();
      EvtVector4R q2 = p->getDaug( samePi2 )->getP4();
      EvtVector4R q3 = p->getDaug( diffPi )->getP4();
 
      EvtVector4R Q      = q1 + q2 + q3;
      double      qMass2 = Q.mass2();
 
      double GA1 = _gammaA1 * pi3G( Q.mass2(), samePi1 ) / pi3G( _mA1 * _mA1, samePi1 );
 
      EvtComplex denBA1( _mA1 * _mA1 - Q.mass2(), -1. * _mA1 * GA1 );
      EvtComplex BA1 = _mA1 * _mA1 / denBA1;
 
      hadCurr = BA1 * ( ( q1 - q3 ) - ( Q * ( Q * ( q1 - q3 ) ) / qMass2 ) * Fpi( q2, q3 ) +
                        ( q2 - q3 ) - ( Q * ( Q * ( q2 - q3 ) ) / qMass2 ) * Fpi( q1, q3 ) );
    }
  }
 
  if ( !foundHadCurr )
  {
    report( ERROR, "EvtGen" ) << "Have not yet implemented this final state in TAUHADNU model"
                              << endl;
    report( ERROR, "EvtGen" ) << "Ndaug=" << getNDaug() << endl;
    int id;
    for ( id = 0; id < ( getNDaug() - 1 ); id++ )
      report( ERROR, "EvtGen" ) << "Daug " << id << " "
                                << EvtPDL::name( getDaug( id ) ).c_str() << endl;
  }
 
  vertex( 0, tau1 * hadCurr );
  vertex( 1, tau2 * hadCurr );
 
  return;
}

getName()

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

virtual

Implements EvtDecayBase.

Definition at line 38 of file EvtTauHadnu.cc.

{ model_name = "TAUHADNU"; }

init()

void EvtTauHadnu::init ( )

virtual

Reimplemented from EvtDecayBase.

Definition at line 42 of file EvtTauHadnu.cc.

                       {
 
  // check that there are 0 arguments
 
  checkSpinParent( EvtSpinType::DIRAC );
 
  // the last daughter should be a neutrino
  checkSpinDaughter( getNDaug() - 1, EvtSpinType::NEUTRINO );
 
  int i;
  for ( i = 0; i < ( getNDaug() - 1 ); i++ ) { checkSpinDaughter( i, EvtSpinType::SCALAR ); }
 
  bool validndaug = false;
 
  if ( getNDaug() == 4 )
  {
    // pipinu
    validndaug = true;
    checkNArg( 7 );
    _beta       = getArg( 0 );
    _mRho       = getArg( 1 );
    _gammaRho   = getArg( 2 );
    _mRhopr     = getArg( 3 );
    _gammaRhopr = getArg( 4 );
    _mA1        = getArg( 5 );
    _gammaA1    = getArg( 6 );
  }
  if ( getNDaug() == 3 )
  {
    // pipinu
    validndaug = true;
    checkNArg( 5 );
    _beta       = getArg( 0 );
    _mRho       = getArg( 1 );
    _gammaRho   = getArg( 2 );
    _mRhopr     = getArg( 3 );
    _gammaRhopr = getArg( 4 );
  }
  if ( getNDaug() == 2 )
  {
    // pipinu
    validndaug = true;
    checkNArg( 0 );
  }
 
  if ( !validndaug )
  {
    report( ERROR, "EvtGen" ) << "Have not yet implemented this final state in TAUHADNU model"
                              << endl;
    report( ERROR, "EvtGen" ) << "Ndaug=" << getNDaug() << endl;
    int id;
    for ( id = 0; id < ( getNDaug() - 1 ); id++ )
      report( ERROR, "EvtGen" ) << "Daug " << id << " "
                                << EvtPDL::name( getDaug( id ) ).c_str() << endl;
  }
}

initProbMax()

void EvtTauHadnu::initProbMax ( )

virtual

Reimplemented from EvtDecayBase.

Definition at line 99 of file EvtTauHadnu.cc.

                              {
 
  if ( getNDaug() == 2 ) setProbMax( 90.0 );
  if ( getNDaug() == 3 ) setProbMax( 2500.0 );
  if ( getNDaug() == 4 ) setProbMax( 5000.0 );
}

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

• EvtTauHadnu.hh
• EvtTauHadnu.cc