EvtMassH1.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: EvtMassH1.cc
//
// Description: Routine to decay a particle  using the invariant mass distribution of histogram
//    dimension one.
//      
// Modification history:
//
//    Ping R.-G.       December, 2006       Module created
//
//------------------------------------------------------------------------
//
#include "EvtGenBase/EvtPatches.hh"
#include <stdlib.h>
#include "EvtGenBase/EvtParticle.hh"
#include "EvtGenBase/EvtGenKine.hh"
#include "EvtGenBase/EvtPDL.hh"
#include "EvtGenBase/EvtVector4C.hh"
#include "EvtGenBase/EvtVector4R.hh"
#include "EvtGenBase/EvtTensor4C.hh"
#include "EvtGenBase/EvtDiracParticle.hh"
#include "EvtGenBase/EvtScalarParticle.hh"
#include "EvtGenBase/EvtVectorParticle.hh"
#include "EvtGenBase/EvtTensorParticle.hh"
#include "EvtGenBase/EvtPhotonParticle.hh" 
#include "EvtGenBase/EvtNeutrinoParticle.hh"
#include "EvtGenBase/EvtStringParticle.hh"
#include "EvtGenBase/EvtRaritaSchwingerParticle.hh"
#include "EvtGenBase/EvtHighSpinParticle.hh"
#include "EvtGenBase/EvtReport.hh"
#include "EvtGenBase/EvtHelSys.hh"
#include "EvtGenModels/EvtMassH1.hh"
#include "EvtGenBase/EvtRandom.hh"
#include <string>
 
#include "TH1.h"  
#include "TAxis.h"
#include "TH2.h"  
#include "TFile.h"
#include "TApplication.h"
#include "TROOT.h"
//#include "CLHEP/config/CLHEP.h"
//#include "CLHEP/config/TemplateFunctions.h"
 
 
using std::endl;
 
EvtMassH1::~EvtMassH1() {}
 
void EvtMassH1::getName(std::string& model_name){
 
  model_name="MassH1";     
 
}
 
EvtDecayBase* EvtMassH1::clone(){
 
  return new EvtMassH1;
 
}
 
 
void EvtMassH1::init(){
 
  // check that there are 4 arguments: Invariant mass part. Index: i,j, histor. file name, Hid 
  checkNArg(0);
  EvtSpinType::spintype parenttype = EvtPDL::getSpinType(getParentId());
}
void EvtMassH1::initProbMax(){
 
  noProbMax();
 
}
 
void EvtMassH1::decay( EvtParticle *p ){
 
 const char* fl=setFileName();
 const char* hp=setHpoint();
 int* dp;
 dp=setDaugPair();
 int d1=dp[0];
 int d2=dp[1];
 
 TFile f(fl);
 TH1F *hid = (TH1F*)f.Get(hp);
 TAxis* xaxis = hid->GetXaxis();
 
 double BLE   =xaxis->GetBinLowEdge(1);
 int    BINS  =xaxis->GetLast();
// double yvalue[BINS+2],ymax=0.0;
 double yvalue[20000],ymax=0.0;
 int i;
// double Ntotal=0,yc[BINS+2];
 double Ntotal=0,yc[20000];
 
 for(i=1;i<BINS+1;i++){
    yvalue[i]=hid->GetBinContent(i);
    if(yvalue[i]>ymax) ymax=yvalue[i];
 }
 
 
loop:
  p->initializePhaseSpace(getNDaug(),getDaugs());
 
  EvtParticle *v,*s1;
  EvtVector4R pv,ps;
  double ppr;
 
  v =p->getDaug(d1); 
  s1=p->getDaug(d2); 
  pv=v->getP4Lab();
  ps=s1->getP4Lab();
  ppr=(pv+ps).mass();
 
  int xbin =hid->FindBin(ppr);
  double xratio=(hid->GetBinContent(xbin))/ymax;
 
  double rd1=EvtRandom::Flat(0.0, 1.0); 
  if(rd1>xratio) goto loop;
  return ;
}