EvtD0mixDalitz Class Reference

#include <EvtD0mixDalitz.hh>

Inheritance diagram for EvtD0mixDalitz:

Public Member Functions
	EvtD0mixDalitz ()
virtual	~EvtD0mixDalitz ()
void	getName (std::string &model_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 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 ()

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 26 of file EvtD0mixDalitz.hh.

Constructor & Destructor Documentation

EvtD0mixDalitz()

EvtD0mixDalitz::EvtD0mixDalitz ( )

inline

Definition at line 102 of file EvtD0mixDalitz.hh.

                   : _d1( 0 ), _d2( 0 ), _d3( 0 ),
             _x( 0. ), _y( 0. ), _qp( 1. ),
             _isKsPiPi( false ), _isRBWmodel( true )
  {}

Referenced by clone().

~EvtD0mixDalitz()

virtual EvtD0mixDalitz::~EvtD0mixDalitz ( )

inlinevirtual

Definition at line 107 of file EvtD0mixDalitz.hh.

{};

Member Function Documentation

clone()

EvtDecayBase * EvtD0mixDalitz::clone ( )

inlinevirtual

Implements EvtDecayBase.

Definition at line 111 of file EvtD0mixDalitz.hh.

{ return new EvtD0mixDalitz; }

decay()

void EvtD0mixDalitz::decay ( EvtParticle *  p )

virtual

Implements EvtDecayBase.

Definition at line 117 of file EvtD0mixDalitz.cc.

{
  // Same structure for all of these decays.
  part->initializePhaseSpace( getNDaug(), getDaugs() );
  EvtVector4R pA = part->getDaug( _d1 )->getP4();
  EvtVector4R pB = part->getDaug( _d2 )->getP4();
  EvtVector4R pC = part->getDaug( _d3 )->getP4();
 
  // Squared invariant masses.
  double m2AB = ( pA + pB ).mass2();
  double m2AC = ( pA + pC ).mass2();
  double m2BC = ( pB + pC ).mass2();
 
  // Dalitz amplitudes of the decay of the particle and that of the antiparticle.
  EvtComplex ampDalitz;
  EvtComplex ampAntiDalitz;
 
  if ( _isKsPiPi )
    { // For Ks pi pi
      EvtDalitzPoint point    ( _mKs, _mPi, _mPi, m2AB, m2BC, m2AC );
      EvtDalitzPoint antiPoint( _mKs, _mPi, _mPi, m2AC, m2BC, m2AB );
 
      ampDalitz     = dalitzKsPiPi( point     );
      ampAntiDalitz = dalitzKsPiPi( antiPoint );
    }
  else
    { // For Ks K K
      EvtDalitzPoint point    ( _mKs, _mK, _mK, m2AB, m2BC, m2AC );
      EvtDalitzPoint antiPoint( _mKs, _mK, _mK, m2AC, m2BC, m2AB );
 
      ampDalitz     = dalitzKsKK( point     );
      ampAntiDalitz = dalitzKsKK( antiPoint );
    }
 
  //_i1    += ampDalitz     * conj( ampDalitz     ) / 1.e8;
  //_iChi  += ampAntiDalitz * conj( ampDalitz     ) / 1.e8;
  //_iChi2 += ampAntiDalitz * conj( ampAntiDalitz ) / 1.e8;
 
  //std::cout << "INTEGRALS: " << _i1 << " " << _iChi << " " << _iChi2 << " " << _iChi / _i1 << " " << _iChi2 / _i1 << std::endl;
 
  // Assume there's no direct CP violation.
  EvtComplex barAOverA = ampAntiDalitz / ampDalitz;
 
  // CP violation in the interference. _qp implements CP violation in the mixing.
  EvtComplex chi = _qp * barAOverA;
 
  // Generate a negative exponential life time. p( gt ) = ( 1 - y ) * e^{ - ( 1 - y ) gt }
  double gt = -log( EvtRandom::Flat() ) / ( 1. - _y );
  part->setLifetime( gt / _gamma );
 
  // Compute time dependent amplitude.
  EvtComplex amp = .5 * ampDalitz * exp( - _y * gt / 2. ) * ( ( 1. + chi ) * h1( gt ) + ( 1. - chi ) * h2( gt ) );
 
  vertex( amp );
 
  return;
}

getName()

void EvtD0mixDalitz::getName ( std::string &  model_name )

inlinevirtual

Implements EvtDecayBase.

Definition at line 110 of file EvtD0mixDalitz.hh.

{ model_name = "D0MIXDALITZ"; }

init()

void EvtD0mixDalitz::init ( )

virtual

Reimplemented from EvtDecayBase.

Definition at line 40 of file EvtD0mixDalitz.cc.

{
  // check that there are 0 arguments
  checkNDaug( 3 );
 
  if ( getNArg() )
    if ( getNArg() == 2 )
      {
    _x = getArg( 0 );
    _y = getArg( 1 );
      }
    else if ( getNArg() == 4 )
      {
    _x = getArg( 0 );
    _y = getArg( 1 );
    _qp = EvtComplex( getArg( 2 ), getArg( 3 ) );
      }
    else if ( getNArg() == 5 )
      {
    _x = getArg( 0 );
    _y = getArg( 1 );
    _qp = EvtComplex( getArg( 2 ), getArg( 3 ) );
    _isRBWmodel = ! getArg( 4 ); // RBW by default. If arg4 is set, do K-matrix.
      }
    else
      {
    report( ERROR, "EvtD0mixDalitz" ) << "Number of arguments for this model must be 0, 2, 4 or 5:" << std::endl
                      << "[ x y ][ qp.re qp.im ][ doK-matrix ]" << std::endl
                      << "Check your dec file." << std::endl;
    exit( 1 );
      }
 
  checkSpinParent  (    _SCALAR );
  checkSpinDaughter( 0, _SCALAR );
  checkSpinDaughter( 1, _SCALAR );
  checkSpinDaughter( 2, _SCALAR );
 
  readPDGValues();
 
  // Get the EvtId of the D0 and its (3) daughters.
  EvtId parId = getParentId();
 
  EvtId dau[ 3 ];
  for ( int index = 0; index < 3; index++ )
    dau[ index ] = getDaug( index );
 
  if ( parId == _D0 ) // Look for K0bar h+ h-. The order must be K[0SL] h+ h-
    for ( int index = 0; index < 3; index++ )
      if      ( ( dau[ index ] == _K0B ) || ( dau[ index ] == _KS ) || ( dau[ index ] == _KL ) )
    _d1 = index;
      else if ( ( dau[ index ] == _PIP ) || ( dau[ index ] == _KP ) )
    _d2 = index;
      else if ( ( dau[ index ] == _PIM ) || ( dau[ index ] == _KM ) )
    _d3 = index;
      else
    reportInvalidAndExit();
  else if ( parId == _D0B ) // Look for K0 h+ h-. The order must be K[0SL] h- h+
    for ( int index = 0; index < 3; index++ )
      if      ( ( dau[ index ] == _K0  ) || ( dau[ index ] == _KS ) || ( dau[ index ] == _KL ) )
    _d1 = index;
      else if ( ( dau[ index ] == _PIM ) || ( dau[ index ] == _KM ) )
    _d2 = index;
      else if ( ( dau[ index ] == _PIP ) || ( dau[ index ] == _KP ) )
    _d3 = index;
      else
    reportInvalidAndExit();
  else
    reportInvalidAndExit();
 
  // Check if we're dealing with Ks pi pi or with Ks K K.
  _isKsPiPi = false;
  if ( dau[ _d2 ] == _PIP || dau[ _d2 ] == _PIM )
    _isKsPiPi = true;
}

initProbMax()

void EvtD0mixDalitz::initProbMax ( )

inlinevirtual

Reimplemented from EvtDecayBase.

Definition at line 112 of file EvtD0mixDalitz.hh.

{ setProbMax( 5200. );       }

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

• EvtD0mixDalitz.hh
• EvtD0mixDalitz.cc