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 "EvtGenBase/EvtPatches.hh"
#include "EvtGenBase/EvtParticle.hh"
#include "EvtGenBase/EvtGenKine.hh"
#include "EvtGenBase/EvtPDL.hh"
#include "EvtGenBase/EvtReport.hh"
#include "EvtGenModels/EvtD0toKSpi0omegaPlot.hh"
#include "EvtGenBase/EvtRandom.hh"
#include <stdlib.h>
#include <string>
 
#include "TFile.h"  
#include "TApplication.h"
#include "TROOT.h"
#include "TH1.h"
#include "TH2.h"
#include "TAxis.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; }
}