EvtD0toKSpi0etaPlot.cc

Go to the documentation of this file.

//--------------------------------------------------------------------------
//
// 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: EvtD0toKspi0etaplot.cc
//
// Modification history:
//
//    Liaoyuan Dong    August, 2022       Module created
//
//------------------------------------------------------------------------
#include "EvtD0toKSpi0etaPlot.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;
 
EvtD0toKSpi0etaPlot::~EvtD0toKSpi0etaPlot() {}
 
void EvtD0toKSpi0etaPlot::getName( std::string& model_name ) {
  model_name = "D0toKSpi0etaPlot";
}
 
EvtDecayBase* EvtD0toKSpi0etaPlot::clone() { return new EvtD0toKSpi0etaPlot; }
 
void EvtD0toKSpi0etaPlot::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( "eta" ) );
  if ( !( idN && idKs && idPi ) )
  {
    std::cout << "EvtD0toKSpi0etaPlot: the daughter sequence should be Ks/Kl pi0 eta"
              << std::endl;
    abort();
  }
 
  EvtSpinType::spintype parenttype = EvtPDL::getSpinType( getParentId() );
 
  Xmin                     = 0.4;
  Xmax                     = 1.734;
  Xwid                     = 0.1334;
  Ymin                     = 0.466;
  Ymax                     = 1.869;
  Ywid                     = 0.1403;
  avm1                     = 0.125;
  double HisPDFtmp[12][12] = {
      { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
      { 0, 0.00527169, 0.0113872, 0.0301807, 0.0804598, 0.0617421, 0.0427827, 0.0540283,
        0.0165289, 0, 0, 0 },
      { 0, 0.020155, 0.0159653, 0.0296171, 0.0808365, 0.0416933, 0.0265935, 0.0193752,
        0.0441176, 0.0259259, 0.0287037, 0 },
      { 0, 0.0417141, 0.0513983, 0.0479749, 0.0659032, 0.0323741, 0.0175809, 0.0304969,
        0.0254219, 0.054984, 0.0801812, 0.0493827 },
      { 0, 0.0388568, 0.00614035, 0.0154096, 0.028749, 0.0281987, 0.0182064, 0.00844951,
        0.00682977, 0.0027885, 0.00239316, -0.0173611 },
      { 0, 0.0100519, 0.0169912, 0.0200723, 0.0272782, 0.0163995, 0.0231309, 0.0170477,
        0.013863, 0.000892459, 0.00420168, 0 },
      { 0, 0.0361953, 0.0251366, 0.0173922, 0.0399432, 0.00877736, 0.0105188, 0.0110497,
        0.0107359, 0.00134903, 0.00448934, 0 },
      { 0, 0.0078219, 0.0234282, 0.0324155, 0.0451149, 0.011002, 0.0149195, 0.00172265,
        0.00821524, 0, 0, 0 },
      { 0, 0.021721, 0.0280722, 0.0341469, 0.0507545, 0.0136752, 0.011148, 0.0100806,
        0.00383142, 0, 0, 0 },
      { 0, 0, 0.0237679, 0.0316915, 0.0674883, 0.018785, 0.0192308, 0.0037594, 0.047619, 0, 0,
        0 },
      { 0, 0, 0.0307692, 0.0461138, 0.0755956, 0.0250696, 0, 0, 0, 0, 0, 0 },
      { 0, 0, 0, 0, 0.0938697, 0.125, 0, 0, 0, 0, 0, 0 },
  };
 
  for ( int i = 0; i < 12; i++ )
  {
    for ( int j = 0; j < 12; j++ ) { HisPDF[i][j] = HisPDFtmp[i][j]; }
  }
}
 
void EvtD0toKSpi0etaPlot::initProbMax() { noProbMax(); }
 
void EvtD0toKSpi0etaPlot::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 EvtD0toKSpi0etaPlot::FindXBin( double mass2 ) {
  if ( mass2 < Xmin ) { return 0; }
  else if ( mass2 >= Xmax ) { return 11; }
  else { return int( ( mass2 - Xmin ) / Xwid ) + 1; }
}
 
int EvtD0toKSpi0etaPlot::FindYBin( double mass2 ) {
  if ( mass2 < Ymin ) { return 0; }
  else if ( mass2 >= Ymax ) { return 11; }
  else { return int( ( mass2 - Ymin ) / Ywid ) + 1; }
}