EvtDtoKSpietaPlot.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: EvtDtoKSpietaPlot.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/EvtDtoKSpietaPlot.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;
 
EvtDtoKSpietaPlot::~EvtDtoKSpietaPlot() {}
 
void EvtDtoKSpietaPlot::getName(std::string& model_name){
        model_name="DtoKSpietaPlot";     
}
 
EvtDecayBase* EvtDtoKSpietaPlot::clone(){
        return new EvtDtoKSpietaPlot;
}
 
 
void EvtDtoKSpietaPlot::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("eta"));
    if(!(idN && idKs && idPi ) ){std::cout<<"EvtDtoKSpietaPlot: the daughter sequence should be Ks/Kl pi+ eta"<<std::endl;abort();}
    EvtSpinType::spintype parenttype = EvtPDL::getSpinType(getParentId());
 
Xmin = 0.406;
Xmax = 1.747;
Xwid = 0.1341;
Ymin = 0.473;
Ymax = 1.882;
Ywid = 0.1409;
avm1  = 0.240741;
double HisPDFtmp[12][12] =
{
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
{0, 1e-07, 0.0119599, 0.0296515, 0.0444187, 0.0196774, 0.00679957, 0.00950145, 0.00704225, 0.0833333, 1e-07, 0},
{0, 0.00265756, 0.00594999, 0.04354, 0.0266106, 0.00888889, 0.0104167, 0.00903452, 0.0110731, 0.00418803, 1e-07, 0},
{0, 0.00629828, 0.0145145, 0.0280041, 0.0236976, 0.0160962, 0.00604595, 0.0225225, 0.00838338, 0.00828402, 0.0102041, 0},
{0, 0.0058566, 0.0214311, 0.0238095, 0.0421477, 0.0116178, 0.0188645, 0.0262201, 0.00917431, 0.00817757, 0.00310856, 0},
{0, 0.00679852, 0.0101833, 0.0106561, 0.0188282, 0.0231757, 0.0246205, 0.0146294, 0.0124968, 0.0152171, 0.00802826, 0},
{0, 0.01116, 0.00961875, 0.0153356, 0.0245832, 0.0207115, 0.0180312, 0.01606, 0.0126437, 0.00146566, 0.00326797, 0},
{0, 0.005919, 0.00744745, 0.0114328, 0.0330096, 0.0306159, 0.0280269, 0.0182468, 0.0111238, 0.00387888, 1e-07, 0},
{0, 0.00185185, 0.00144012, 0.0189673, 0.0478907, 0.0233768, 0.0250272, 0.0130943, 0.0166364, 1e-07, 1e-07, 0},
{0, 1e-07, 0.00462388, 0.0170154, 0.0512206, 0.0407905, 0.0289623, 0.0307394, 1e-07, 1e-07, 1e-07, 0},
{0, 1e-07, 0.00657895, 0.0152134, 0.0479368, 0.0486111, 0.0318021, 0.166667, 1e-07, 1e-07, 1e-07, 0},
{0, 0, 0, 0, 0.0689655, 0.240741, 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 EvtDtoKSpietaPlot::initProbMax(){
        noProbMax();
}
 
void EvtDtoKSpietaPlot::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 EvtDtoKSpietaPlot::FindXBin(double mass2) {
  if (mass2 < Xmin) { return 0; }
  else if (mass2>=Xmax) { return 11; }
  else { return int((mass2-Xmin)/Xwid)+1; }
}
 
int EvtDtoKSpietaPlot::FindYBin(double mass2) {
  if (mass2 < Ymin) { return 0; }
  else if (mass2>=Ymax) { return 11; }
  else { return int((mass2-Ymin)/Ywid)+1; }
}