EvtSSSCPpng Class Reference

#include <EvtSSSCPpng.hh>

Inheritance diagram for EvtSSSCPpng:

Public Member Functions
	EvtSSSCPpng ()
virtual	~EvtSSSCPpng ()
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 EvtSSSCPpng.hh.

Constructor & Destructor Documentation

EvtSSSCPpng()

EvtSSSCPpng::EvtSSSCPpng ( )

inline

Definition at line 31 of file EvtSSSCPpng.hh.

{}

Referenced by clone().

~EvtSSSCPpng()

EvtSSSCPpng::~EvtSSSCPpng ( )

virtual

Definition at line 35 of file EvtSSSCPpng.cc.

{}

Member Function Documentation

clone()

EvtDecayBase * EvtSSSCPpng::clone ( )

virtual

Implements EvtDecayBase.

Definition at line 39 of file EvtSSSCPpng.cc.

{ return new EvtSSSCPpng; }

decay()

void EvtSSSCPpng::decay ( EvtParticle * p )

virtual

Implements EvtDecayBase.

Definition at line 58 of file EvtSSSCPpng.cc.

                                        {
 
  // added by Lange Jan4,2000
  static EvtId B0  = EvtPDL::getId( "B0" );
  static EvtId B0B = EvtPDL::getId( "anti-B0" );
 
  double t;
  EvtId  other_b;
 
  p->initializePhaseSpace( getNDaug(), getDaugs() );
 
  EvtComplex amp;
 
  EvtComplex A, Abar;
  // EvtComplex ACC, AbarCC;
 
  // assume single (top) quark dominance for the penguin.
 
  // old: a0=alpha, a1=dm, a2=1, a3=1, a4=0, a5=1, a6=0
  // new: a0=beta, a1=gamma, a2=delta, a3=dm, a4=1, a5=1=A_{T}, a6=A_{P}/A_{T}
 
  // e.g., for B -> pi pi
  // A_{T} = |V_{ub} V_{ud}| T
  // A_{P} = |V_{tb} V_{td}| P
  // P and T are purely hadronic matrix elements
  // P/T = 0.055, A_{P}/A_{T} = 0.2 (see Marrocchesi and Paver, hep-ph/9702353)
 
  // A = A_{T}( exp(i(beta+gamma)) + (A_{P}/A_{T}) exp(i(delta))
  // A_bar = same, except for the sign of the weak phases
  // here, delta = delta_{p}-delta_{t} (rel. strong phase)
 
  A = getArg( 5 ) *
      ( EvtComplex( cos( -getArg( 0 ) - getArg( 1 ) ), sin( -getArg( 0 ) - getArg( 1 ) ) ) +
        getArg( 6 ) * EvtComplex( cos( getArg( 2 ) ), sin( getArg( 2 ) ) ) );
 
  Abar = getArg( 5 ) *
         ( EvtComplex( cos( getArg( 0 ) + getArg( 1 ) ), sin( getArg( 0 ) + getArg( 1 ) ) ) +
           getArg( 6 ) * EvtComplex( cos( getArg( 2 ) ), sin( getArg( 2 ) ) ) );
 
  // get fraction of B0 tags with these amplitudes
 
  // double xd = 0.65;
  double ratio = 1 / ( 1 + 0.65 * 0.65 );
 
  EvtComplex rf, rbarf;
 
  rf    = EvtComplex( cos( 2.0 * getArg( 0 ) ), sin( 2.0 * getArg( 0 ) ) ) * Abar / A;
  rbarf = EvtComplex( 1.0 ) / rf;
 
  double A2    = real( A ) * real( A ) + imag( A ) * imag( A );
  double Abar2 = real( Abar ) * real( Abar ) + imag( Abar ) * imag( Abar );
 
  double rf2    = real( rf ) * real( rf ) + imag( rf ) * imag( rf );
  double rbarf2 = real( rbarf ) * real( rbarf ) + imag( rbarf ) * imag( rbarf );
 
  // fraction of B0 _tags_
  double fract = ( Abar2 * ( 1 + rbarf2 + ( 1 - rbarf2 ) * ratio ) ) /
                 ( Abar2 * ( 1 + rbarf2 + ( 1 - rbarf2 ) * ratio ) +
                   A2 * ( 1 + rf2 + ( 1 - rf2 ) * ratio ) );
 
  EvtCPUtil::OtherB( p, t, other_b, fract );
 
  // this method works just as well -- NK
  // randomly generate the tag (B0 or B0B)
 
  //  double tag = EvtRandom::Flat(0.0,1.0);
  //  if (tag < 0.5) {
  //
  //   EvtCPUtil::OtherB(p,t,other_b,1.0);
  //   other_b = B0;
  //  }
  //  else {
  //
  //   EvtCPUtil::OtherB(p,t,other_b,0.0);
  //   other_b = B0B;
  //  }
 
  // mixing angle = -beta
 
  if ( other_b == B0B )
  {
    amp = A * cos( getArg( 3 ) * t / ( 2 * EvtConst::c ) ) +
          EvtComplex( cos( 2.0 * getArg( 0 ) ), sin( 2.0 * getArg( 0 ) ) ) * getArg( 4 ) *
              EvtComplex( 0.0, 1.0 ) * Abar * sin( getArg( 3 ) * t / ( 2 * EvtConst::c ) );
  }
  if ( other_b == B0 )
  {
    amp = A * EvtComplex( cos( -2.0 * getArg( 0 ) ), sin( -2.0 * getArg( 0 ) ) ) *
              EvtComplex( 0.0, 1.0 ) * sin( getArg( 3 ) * t / ( 2 * EvtConst::c ) ) +
          getArg( 4 ) * Abar * cos( getArg( 3 ) * t / ( 2 * EvtConst::c ) );
  }
 
  vertex( amp );
 
  return;
}

getName()

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

virtual

Implements EvtDecayBase.

Definition at line 37 of file EvtSSSCPpng.cc.

{ model_name = "SSS_CP_PNG"; }

init()

void EvtSSSCPpng::init ( )

virtual

Reimplemented from EvtDecayBase.

Definition at line 41 of file EvtSSSCPpng.cc.

                       {
 
  // check that there are 7 arguments
  checkNArg( 7 );
  checkNDaug( 2 );
 
  checkSpinParent( EvtSpinType::SCALAR );
 
  checkSpinDaughter( 0, EvtSpinType::SCALAR );
  checkSpinDaughter( 1, EvtSpinType::SCALAR );
}

initProbMax()

void EvtSSSCPpng::initProbMax ( )

virtual

Reimplemented from EvtDecayBase.

Definition at line 53 of file EvtSSSCPpng.cc.

                              {
 
  setProbMax( getArg( 5 ) * getArg( 5 ) * ( 1 + getArg( 6 ) * getArg( 6 ) ) );
}

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

• EvtSSSCPpng.hh
• EvtSSSCPpng.cc