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