EvtDtoKSpiomegaPlot.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: EvtDtoKSpiomegaPlot.cc
//
// Modification history:
//
//    Liaoyuan Dong    August, 2022       Module created
//
//------------------------------------------------------------------------
#include "EvtDtoKSpiomegaPlot.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;
 
EvtDtoKSpiomegaPlot::~EvtDtoKSpiomegaPlot() {}
 
void EvtDtoKSpiomegaPlot::getName( std::string& model_name ) {
  model_name = "DtoKSpiomegaPlot";
}
 
EvtDecayBase* EvtDtoKSpiomegaPlot::clone() { return new EvtDtoKSpiomegaPlot; }
 
void EvtDtoKSpiomegaPlot::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( "pi+" ) ) ||
              getDaugs()[1] == EvtPDL::getId( std::string( "pi-" ) );
  bool idPi = getDaugs()[2] == EvtPDL::getId( std::string( "omega" ) );
  if ( !( idN && idKs && idPi ) )
  {
    std::cout << "EvtDtoKSpiomegaPlot: the daughter sequence should be K_S0/K_L0 pi+ omega"
              << std::endl;
    abort();
  }
  EvtSpinType::spintype parenttype = EvtPDL::getSpinType( getParentId() );
 
  Xmin                     = 0.405769;
  Xmax                     = 1.18157;
  Xwid                     = 0.096975;
  Ymin                     = 0.850084;
  Ymax                     = 1.88238;
  Ywid                     = 0.129038;
  avm1                     = 0.235;
  double HisPDFtmp[10][10] = {
      { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
      { 0, 1e-08, 0.120721, 0.052381, 0.0146277, 1e-08, 0.0325342, 0.235, 1e-08, 0 },
      { 0, 0.048494, 0.0426205, 0.057598, 0.0610795, 0.0782258, 0.0776099, 0.0327206,
        0.00078125, 0 },
      { 0.111111, 0.00310078, 0.0329032, 0.08, 0.0677989, 0.139752, 0.134032, 0.0708333,
        0.0407328, 0 },
      { -0.108333, 0.0421875, 0.0802147, 0.075, 0.0754011, 0.187206, 0.12803, 0.0151351,
        0.0235849, -0.0928571 },
      { 0, 0.0457386, 0.033237, 0.0667614, 0.126403, 0.173194, 0.108482, 0.0508333, 0.0395349,
        -0.325 },
      { 0, 0.05, 0.0637931, 0.0892663, 0.141294, 0.125867, 0.111432, 0.0390288, 0.0578571, 0 },
      { 0, 1e-08, 1e-08, 0.0670455, 0.0672059, 0.0942187, 0.0969551, 0.0503425, 1e-08, 0 },
      { 0, 1e-08, 1e-08, 0.0186937, 0.0445402, 0.027, 0.00136364, 1e-08, 1e-08, 0 },
      { 0, 0, 0, -0.08125, 0.0769231, -0.0464286, 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 EvtDtoKSpiomegaPlot::initProbMax() { noProbMax(); }
 
void EvtDtoKSpiomegaPlot::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_ksopi
  //        xmass13=(pd1+pd3).mass()*(pd1+pd3).mass();  // M_ksow
  xmass23 = ( pd2 + pd3 ).mass() * ( pd2 + pd3 ).mass(); // M_piw
 
  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 EvtDtoKSpiomegaPlot::FindXBin( double mass2 ) {
  if ( mass2 < Xmin ) { return 0; }
  else if ( mass2 >= Xmax ) { return 9; }
  else { return int( ( mass2 - Xmin ) / Xwid ) + 1; }
}
 
int EvtDtoKSpiomegaPlot::FindYBin( double mass2 ) {
  if ( mass2 < Ymin ) { return 0; }
  else if ( mass2 >= Ymax ) { return 9; }
  else { return int( ( mass2 - Ymin ) / Ywid ) + 1; }
}