EvtD0toKSpi0omegaPlot.cc

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//--------------------------------------------------------------------------
//
// Environment:
//      This software is part of models developed at BES collaboration
//      based on the EvtGen framework.  If you use all or part
//      of it, please give an appropriate acknowledgement.
//
// Copyright Information: See EvtGen/BesCopyright
//      Copyright (A) 2006      Ping Rong-Gang @IHEP
//
// Module: EvtD0toKSpi0omegaPlot.cc
//
// Modification history:
//
//    Liaoyuan Dong    August, 2022       Module created
//
//------------------------------------------------------------------------
#include "EvtD0toKSpi0omegaPlot.hh"
#include "../EvtGenBase/EvtGenKine.hh"
#include "../EvtGenBase/EvtPDL.hh"
#include "../EvtGenBase/EvtParticle.hh"
#include "../EvtGenBase/EvtPatches.hh"
#include "../EvtGenBase/EvtRandom.hh"
#include "../EvtGenBase/EvtReport.hh"
#include <stdlib.h>
#include <string>
 
#include "TApplication.h"
#include "TAxis.h"
#include "TFile.h"
#include "TH1.h"
#include "TH2.h"
#include "TROOT.h"
using std::endl;
 
EvtD0toKSpi0omegaPlot::~EvtD0toKSpi0omegaPlot() {}
 
void EvtD0toKSpi0omegaPlot::getName( std::string& model_name ) {
  model_name = "D0toKSpi0omegaPlot";
}
 
EvtDecayBase* EvtD0toKSpi0omegaPlot::clone() { return new EvtD0toKSpi0omegaPlot; }
 
void EvtD0toKSpi0omegaPlot::init() {
 
  checkNArg( 0 );
 
  bool idN = getDaugs()[0] == EvtPDL::getId( std::string( "K_S0" ) ) ||
             getDaugs()[0] == EvtPDL::getId( std::string( "K_L0" ) );
  bool idKs = getDaugs()[1] == EvtPDL::getId( std::string( "pi0" ) );
  bool idPi = getDaugs()[2] == EvtPDL::getId( std::string( "omega" ) );
  if ( !( idN && idKs && idPi ) )
  {
    std::cout << "EvtD0toKSpi0omegaPlot: the daughter sequence should be K_S0/K_L0 pi0 omega"
              << std::endl;
    abort();
  }
 
  EvtSpinType::spintype parenttype = EvtPDL::getSpinType( getParentId() );
 
  Xmin                     = 0.400689;
  Xmax                     = 1.17072;
  Xwid                     = 0.0962544;
  Ymin                     = 0.842724;
  Ymax                     = 1.86869;
  Ywid                     = 0.128246;
  avm1                     = 0.55;
  double HisPDFtmp[10][10] = {
      { 0, 0, 0, -0.045, 0, 0, 0, 0, 0, 0 },
      { 0, 0, 0.00833333, 0.00315657, 0.0461656, 0.0871429, 0, 0, 0, 0 },
      { -0.225, 0, 0.032197, 0.0104286, 0.0537143, 0.105189, 0.0856757, 0.0108333, 0.00384615,
        0 },
      { -0.075, 0.0677734, 0.0462291, 0.0108333, 0.10436, 0.15014, 0.125556, 0.0151667, 0.047,
        0 },
      { 0, 0.0615854, 0.0972857, 0.0986446, 0.135901, 0.10452, 0.147305, 0.161376, 0.117778,
        0.065 },
      { 0, 0.245879, 0.13997, 0.173571, 0.101585, 0.061244, 0.158564, 0.182229, 0.170783,
        0.55 },
      { 0, 0.0411458, 0.0598214, 0.043099, 0.0399235, 0.131534, 0.107424, 0.107069, 0.087931,
        0 },
      { 0, 0, 0.00392157, 0.09375, 0.123066, 0.145382, 0.0534591, 0.0191176, 0, 0 },
      { 0, 0, 0.0458333, 0.0330556, 0.101357, 0.0558559, 0.0989362, 0.5, 0, 0 },
      { 0, 0, 0, -0.3375, 0.025, -0.045, 0, 0, 0, 0 } };
 
  for ( int i = 0; i < 10; i++ )
  {
    for ( int j = 0; j < 10; j++ ) { HisPDF[i][j] = HisPDFtmp[i][j]; }
  }
}
 
void EvtD0toKSpi0omegaPlot::initProbMax() { noProbMax(); }
 
void EvtD0toKSpi0omegaPlot::decay( EvtParticle* p ) {
 
loop:
  p->initializePhaseSpace( getNDaug(), getDaugs() );
 
  EvtParticle *id1, *id2, *id3;
  EvtVector4R  pd1, pd2, pd3;
  double       xmass13, xmass12, xmass23;
 
  id1 = p->getDaug( 0 );
  id2 = p->getDaug( 1 );
  id3 = p->getDaug( 2 );
 
  pd1 = id1->getP4Lab();
  pd2 = id2->getP4Lab();
  pd3 = id3->getP4Lab();
 
  xmass12 = ( pd1 + pd2 ).mass() * ( pd1 + pd2 ).mass(); // M_ksopi0
  //        xmass13=(pd1+pd3).mass()*(pd1+pd3).mass();  // M_ksow
  xmass23 = ( pd2 + pd3 ).mass() * ( pd2 + pd3 ).mass(); // M_pi0w
 
  int    xbin     = FindXBin( xmass12 );
  int    ybin     = FindYBin( xmass23 );
  double xratio12 = HisPDF[xbin][ybin] / avm1;
 
  if ( xratio12 <= 0 ) goto loop;
 
  double rd12 = EvtRandom::Flat( 0.0, 1.0 );
  if ( rd12 > xratio12 ) goto loop;
 
  return;
}
 
int EvtD0toKSpi0omegaPlot::FindXBin( double mass2 ) {
  if ( mass2 < Xmin ) { return 0; }
  else if ( mass2 >= Xmax ) { return 9; }
  else { return int( ( mass2 - Xmin ) / Xwid ) + 1; }
}
 
int EvtD0toKSpi0omegaPlot::FindYBin( double mass2 ) {
  if ( mass2 < Ymin ) { return 0; }
  else if ( mass2 >= Ymax ) { return 9; }
  else { return int( ( mass2 - Ymin ) / Ywid ) + 1; }
}