EvtBtoKpiCPiso.cc

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//--------------------------------------------------------------------------
//
// Environment:
//      This software is part of the EvtGen package developed jointly
//      for the BaBar and CLEO collaborations.  If you use all or part
//      of it, please give an appropriate acknowledgement.
//
// Copyright Information: See EvtGen/COPYRIGHT
//      Copyright (C) 1998      Caltech, UCSB
//
// Module: EvtBtoKpiCPiso.cc
//
// Description: Routine to decay B -> K pi with isospin amplitudes
//
// Modification history:
//
//    RYD/NK     Febuary 7, 1998         Module created
//
//------------------------------------------------------------------------
//
#include "EvtBtoKpiCPiso.hh"
#include "../EvtGenBase/EvtGenKine.hh"
#include "../EvtGenBase/EvtPDL.hh"
#include "../EvtGenBase/EvtParticle.hh"
#include "../EvtGenBase/EvtPatches.hh"
#include "../EvtGenBase/EvtReport.hh"
#include <stdlib.h>
#include <string>
 
EvtBtoKpiCPiso::~EvtBtoKpiCPiso() {}
 
void EvtBtoKpiCPiso::getName( std::string& model_name ) { model_name = "BTOKPI_CP_ISO"; }
 
EvtDecayBase* EvtBtoKpiCPiso::clone() { return new EvtBtoKpiCPiso; }
 
void EvtBtoKpiCPiso::init() {
 
  // check that there are 15 arguments
  checkNArg( 15 );
  checkNDaug( 2 );
 
  checkSpinParent( EvtSpinType::SCALAR );
 
  checkSpinDaughter( 0, EvtSpinType::SCALAR );
  checkSpinDaughter( 1, EvtSpinType::SCALAR );
}
 
void EvtBtoKpiCPiso::initProbMax() {
 
  // this might need to be revised
 
  // added by Lange Jan4,2000
  static EvtId PI0 = EvtPDL::getId( "pi0" );
  static EvtId PIP = EvtPDL::getId( "pi+" );
  static EvtId PIM = EvtPDL::getId( "pi+" );
  static EvtId K0  = EvtPDL::getId( "K0" );
  static EvtId KB  = EvtPDL::getId( "anti-K0" );
  static EvtId KP  = EvtPDL::getId( "K+" );
  static EvtId KM  = EvtPDL::getId( "K-" );
 
  if ( ( ( getDaug( 0 ) == PI0 ) && ( getDaug( 1 ) == KP ) ) ||
       ( ( getDaug( 0 ) == KP ) && ( getDaug( 1 ) == PI0 ) ) )
  { setProbMax( 2.0 * ( getArg( 2 ) * getArg( 2 ) + getArg( 10 ) * getArg( 10 ) ) ); }
 
  if ( ( ( getDaug( 0 ) == PI0 ) && ( getDaug( 1 ) == KM ) ) ||
       ( ( getDaug( 0 ) == KM ) && ( getDaug( 1 ) == PI0 ) ) )
  { setProbMax( 2.0 * ( getArg( 4 ) * getArg( 4 ) + getArg( 12 ) * getArg( 12 ) ) ); }
 
  if ( ( ( getDaug( 0 ) == PIP ) && ( getDaug( 1 ) == K0 ) ) ||
       ( ( getDaug( 0 ) == K0 ) && ( getDaug( 1 ) == PIP ) ) )
  { setProbMax( 4.0 * ( getArg( 6 ) * getArg( 6 ) + getArg( 10 ) * getArg( 10 ) ) ); }
 
  if ( ( ( getDaug( 0 ) == PIM ) && ( getDaug( 1 ) == KB ) ) ||
       ( ( getDaug( 0 ) == KB ) && ( getDaug( 1 ) == PIM ) ) )
  { setProbMax( 4.0 * ( getArg( 8 ) * getArg( 8 ) + getArg( 12 ) * getArg( 12 ) ) ); }
 
  if ( ( ( getDaug( 0 ) == PI0 ) && ( getDaug( 1 ) == K0 ) ) ||
       ( ( getDaug( 0 ) == K0 ) && ( getDaug( 1 ) == PI0 ) ) )
  { setProbMax( 2.0 * ( getArg( 2 ) * getArg( 2 ) + getArg( 10 ) * getArg( 10 ) ) ); }
 
  if ( ( ( getDaug( 0 ) == PI0 ) && ( getDaug( 1 ) == KB ) ) ||
       ( ( getDaug( 0 ) == KB ) && ( getDaug( 1 ) == PI0 ) ) )
  { setProbMax( 2.0 * ( getArg( 4 ) * getArg( 4 ) + getArg( 12 ) * getArg( 12 ) ) ); }
 
  if ( ( ( getDaug( 0 ) == PIM ) && ( getDaug( 1 ) == KP ) ) ||
       ( ( getDaug( 0 ) == KP ) && ( getDaug( 1 ) == PIM ) ) )
  { setProbMax( 4.0 * ( getArg( 6 ) * getArg( 6 ) + getArg( 10 ) * getArg( 10 ) ) ); }
 
  if ( ( ( getDaug( 0 ) == PIP ) && ( getDaug( 1 ) == KM ) ) ||
       ( ( getDaug( 0 ) == KM ) && ( getDaug( 1 ) == PIP ) ) )
  { setProbMax( 4.0 * ( getArg( 8 ) * getArg( 8 ) + getArg( 12 ) * getArg( 12 ) ) ); }
}
 
void EvtBtoKpiCPiso::decay( EvtParticle* p ) {
 
  p->initializePhaseSpace( getNDaug(), getDaugs() );
  // added by Lange Jan4,2000
  static EvtId PI0 = EvtPDL::getId( "pi0" );
  static EvtId PIP = EvtPDL::getId( "pi+" );
  static EvtId PIM = EvtPDL::getId( "pi+" );
  static EvtId K0  = EvtPDL::getId( "K0" );
  static EvtId KB  = EvtPDL::getId( "anti-K0" );
  static EvtId KP  = EvtPDL::getId( "K+" );
  static EvtId KM  = EvtPDL::getId( "K-" );
 
  EvtComplex A;
  EvtComplex U, Ubar, V, Vbar, W, Wbar;
 
  U    = EvtComplex( getArg( 2 ) * cos( getArg( 3 ) ), getArg( 2 ) * sin( getArg( 3 ) ) );
  Ubar = EvtComplex( getArg( 4 ) * cos( getArg( 5 ) ), getArg( 4 ) * sin( getArg( 5 ) ) );
  V    = EvtComplex( getArg( 6 ) * cos( getArg( 7 ) ), getArg( 6 ) * sin( getArg( 7 ) ) );
  Vbar = EvtComplex( getArg( 8 ) * cos( getArg( 9 ) ), getArg( 8 ) * sin( getArg( 9 ) ) );
  W    = EvtComplex( getArg( 10 ) * cos( getArg( 11 ) ), getArg( 10 ) * sin( getArg( 11 ) ) );
  Wbar = EvtComplex( getArg( 12 ) * cos( getArg( 13 ) ), getArg( 12 ) * sin( getArg( 13 ) ) );
 
  // depending on what combination of K pi we have, there will be different
  // A and Abar (only A given in comments!)
 
  if ( ( ( getDaug( 0 ) == PI0 ) && ( getDaug( 1 ) == KP ) ) ||
       ( ( getDaug( 0 ) == KP ) && ( getDaug( 1 ) == PI0 ) ) )
  {
 
    // pi0 K+, so U - W
 
    A = U - W;
  }
 
  if ( ( ( getDaug( 0 ) == PI0 ) && ( getDaug( 1 ) == KM ) ) ||
       ( ( getDaug( 0 ) == KM ) && ( getDaug( 1 ) == PI0 ) ) )
  {
 
    // pi0 K-, so Ubar - Wbar
 
    A = Ubar - Wbar;
  }
 
  if ( ( ( getDaug( 0 ) == PIP ) && ( getDaug( 1 ) == K0 ) ) ||
       ( ( getDaug( 0 ) == K0 ) && ( getDaug( 1 ) == PIP ) ) )
  {
 
    // pi+ K0, so V + W
 
    A = sqrt( 2.0 ) * ( V + W );
  }
 
  if ( ( ( getDaug( 0 ) == PIM ) && ( getDaug( 1 ) == KB ) ) ||
       ( ( getDaug( 0 ) == KB ) && ( getDaug( 1 ) == PIM ) ) )
  {
 
    // pi- K0bar, so Vbar + Wbar
    A = sqrt( 2.0 ) * ( Vbar + Wbar );
  }
 
  if ( ( ( getDaug( 0 ) == PI0 ) && ( getDaug( 1 ) == K0 ) ) ||
       ( ( getDaug( 0 ) == K0 ) && ( getDaug( 1 ) == PI0 ) ) )
  {
 
    // pi0 K0, so U + W
 
    A = U + W;
  }
 
  if ( ( ( getDaug( 0 ) == PI0 ) && ( getDaug( 1 ) == KB ) ) ||
       ( ( getDaug( 0 ) == KB ) && ( getDaug( 1 ) == PI0 ) ) )
  { A = Ubar + Wbar; }
 
  if ( ( ( getDaug( 0 ) == PIM ) && ( getDaug( 1 ) == KP ) ) ||
       ( ( getDaug( 0 ) == KP ) && ( getDaug( 1 ) == PIM ) ) )
  {
 
    // pi- K+, so V - W
 
    A = sqrt( 2.0 ) * ( V - W );
  }
 
  if ( ( ( getDaug( 0 ) == PIP ) && ( getDaug( 1 ) == KM ) ) ||
       ( ( getDaug( 0 ) == KM ) && ( getDaug( 1 ) == PIP ) ) )
  { A = sqrt( 2.0 ) * ( Vbar - Wbar ); }
 
  vertex( A );
 
  return;
}