EvtD0mixDalitz.hh

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/*****************************************************************************
 * Project: BaBar detector at the SLAC PEP-II B-factory
 * Package: EvtGenModels
 *    File: $Id: EvtD0mixDalitz.hh,v 1.1 2009/05/08 01:59:56 pingrg Exp $
 *
 * Description:
 *   The D0mixDalitz model, with many resonances and mixing implemented.
 *
 * Modification history:
 *   Jordi Garra Tic�     2008/07/03         File created
 *****************************************************************************/
 
#ifndef __EVTD0MIXDALITZ_HH__
#define __EVTD0MIXDALITZ_HH__
 
#include "EvtGenBase/EvtComplex.hh"
#include "EvtGenBase/EvtPDL.hh"
#include "EvtGenBase/EvtId.hh"
#include "EvtGenBase/EvtDecayAmp.hh"
#include "EvtGenBase/EvtDalitzPoint.hh"
#include "EvtGenBase/EvtSpinType.hh"
#include "EvtGenBase/EvtDalitzReso.hh"
#include "EvtGenBase/EvtCyclic3.hh"
 
 
class EvtD0mixDalitz : public EvtDecayAmp
{
private:
  int _d1;
  int _d2;
  int _d3;
 
  // Mixing parameters.
  double _x;
  double _y;
 
  // q/p CP violation in the mixing.
  EvtComplex _qp;
 
  // Checker of the decay mode.
  bool _isKsPiPi;
  bool _isRBWmodel;
 
  // Useful constants.
  static const EvtSpinType::spintype& _SCALAR;
  static const EvtSpinType::spintype& _VECTOR;
  static const EvtSpinType::spintype& _TENSOR;
 
  static const EvtDalitzReso::CouplingType& _EtaPic;
  static const EvtDalitzReso::CouplingType& _PicPicKK;
 
  static const EvtDalitzReso::NumType& _RBW;
  static const EvtDalitzReso::NumType& _GS;
  static const EvtDalitzReso::NumType& _KMAT;
 
  static const EvtCyclic3::Pair& _AB;
  static const EvtCyclic3::Pair& _AC;
  static const EvtCyclic3::Pair& _BC;
 
  // Values to be read or computed based on values in the evt.pdl file.
  // IDs of the relevant particles.
  EvtId _D0;
  EvtId _D0B;
  EvtId _KM;
  EvtId _KP;
  EvtId _K0;
  EvtId _K0B;
  EvtId _KL;
  EvtId _KS;
  EvtId _PIM;
  EvtId _PIP;
 
  // Masses of the relevant particles.
  double _mD0;
  double _mKs;
  double _mPi;
  double _mK;
 
  // Life time and decay rate.
  double _ctau;
  double _gamma;
 
  // Some useful integrals over the Dalitz plot.
  EvtComplex _iChi;
  EvtComplex _iChi2;
 
  void readPDGValues();
  EvtComplex dalitzKsPiPi( const EvtDalitzPoint& point );
  EvtComplex dalitzKsKK  ( const EvtDalitzPoint& point );
 
  // Time evolution functions for hamiltonian eigenstates.
  //    Negative exponential part removed.
  EvtComplex h1( const double& ct ) const;
  EvtComplex h2( const double& ct ) const;
 
  void reportInvalidAndExit() const
  {
    report( ERROR, "EvtD0mixDalitz" ) << "EvtD0mixDalitz: Invalid mode." << std::endl;
    exit( 1 );
  }
public:
  EvtD0mixDalitz() : _d1( 0 ), _d2( 0 ), _d3( 0 ),
             _x( 0. ), _y( 0. ), _qp( 1. ),
             _isKsPiPi( false ), _isRBWmodel( true )
  {}
 
  virtual ~EvtD0mixDalitz() {};
 
  // One-line inline functions.
  void  getName(std::string& model_name) { model_name = "D0MIXDALITZ"; }
  EvtDecayBase* clone()   { return new EvtD0mixDalitz; }
  void initProbMax()      { setProbMax( 5200. );       }
 
  void init();
  void decay( EvtParticle* p );
};
 
#endif