EvtD0toKpietaPlot.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: EvtD0toKpietaPlot.cc
//
// Modification history:
//
//    Liaoyuan Dong    August, 2022       Module created
//
//------------------------------------------------------------------------
#include "EvtD0toKpietaPlot.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;
 
EvtD0toKpietaPlot::~EvtD0toKpietaPlot() {}
 
void EvtD0toKpietaPlot::getName( std::string& model_name ) { model_name = "D0toKpietaPlot"; }
 
EvtDecayBase* EvtD0toKpietaPlot::clone() { return new EvtD0toKpietaPlot; }
 
void EvtD0toKpietaPlot::init() {
 
  checkNArg( 0 );
 
  bool idN = getDaugs()[0] == EvtPDL::getId( std::string( "K-" ) ) ||
             getDaugs()[0] == EvtPDL::getId( std::string( "K+" ) );
  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 << "EvtD0toKpietaPlot: the daughter sequence should be K- pi+ eta" << std::endl;
    abort();
  }
  EvtSpinType::spintype parenttype = EvtPDL::getSpinType( getParentId() );
 
  Xmin                     = 0.401;
  Xmax                     = 1.734;
  Xwid                     = 0.0888667;
  Ymin                     = 0.473;
  Ymax                     = 1.88;
  Ywid                     = 0.0938;
  avm1                     = 4.0;
  double HisPDFtmp[17][17] = {
      { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
      { 0, 1e-07, 0.026749, 0.00605681, 0.0634184, 0.0892256, 0.202502, 0.176861, 0.14297,
        0.0871013, 0.0597803, 0.0816327, 1e-07, 1e-07, 1e-07, 1e-07, 0 },
      { 0, 0.0333333, 0.0170782, 0.0151869, 0.0481322, 0.0805231, 0.205394, 0.116217,
        0.0875592, 0.129291, 0.0702469, 0.0752794, 0.100899, 0.0771605, 0.0869565, 1e-07, 0 },
      { 0, 0.0280093, 0.0390357, 0.0253937, 0.0261579, 0.071521, 0.141498, 0.104404, 0.0741497,
        0.0714744, 0.0822128, 0.0975891, 0.155818, 0.159259, 0.185316, 0.148148, 0 },
      { 0, 0.113668, 0.119763, 0.0787132, 0.102704, 0.112065, 0.135281, 0.0820707, 0.0419041,
        0.079242, 0.0900836, 0.150758, 0.264155, 0.316919, 0.317745, 0.431149, 0 },
      { 0, 0.589684, 0.371107, 0.293253, 0.168061, 0.120212, 0.187226, 0.103501, 0.0238857,
        0.0322682, 0.0430699, 0.131763, 0.254585, 0.314903, 0.422812, 0.531974, -0.0925926 },
      { 0, 0.171536, 0.092114, 0.0382082, 0.0237244, 1e-07, 0.0313214, 0.025242, 0.0140927,
        0.019018, 0.0117647, 0.00504009, 0.00752062, 0.0128317, 0.0120773, 0.00329218, 0 },
      { 0, 0.0398736, 0.0122582, 0.000112007, 0.0110455, 0.0132114, 0.0126157, 0.00567562,
        0.00792236, 0.0138889, 0.0132507, 0.0179872, 0.00873761, 0.00735294, 1e-07, 1e-07, 0 },
      { 0, 0.0320175, 0.0250501, 0.0182082, 0.0198841, 0.0312431, 0.0178492, 0.00932836,
        0.00484048, 0.0196806, 0.0125213, 0.0167646, 0.0242894, 0.0175224, 0.00443081,
        0.012037, 0 },
      { 0, 0.0281924, 0.0348485, 0.055883, 0.025371, 0.0317179, 0.0222222, 0.0132327, 1e-07,
        0.00288889, 0.00841751, 0.0165652, 0.0143026, 0.013714, 0.000664011, 1e-07, 0 },
      { 0, 0.0814623, 0.0519035, 0.0857828, 0.050823, 0.0422381, 0.038486, 0.00943396,
        0.00109127, 0.003367, 0.00705829, 0.00633333, 0.00933246, 0.00857237, 0.0114638, 1e-07,
        0 },
      { 0, 0.0945946, 0.103036, 0.0933035, 0.0920969, 0.0668599, 0.0459987, 0.0155599,
        0.00218477, 1e-07, 0.00224791, 0.00819475, 0.00309358, 0.00826446, 1e-07, 1e-07, 0 },
      { 0, 1e-07, 0.0715244, 0.084398, 0.0704767, 0.0615041, 0.0658281, 0.00491735, 0.00484436,
        0.00573099, 0.00257898, 0.003927, 0.0204082, 1e-07, 1e-07, 1e-07, 0 },
      { 0, 1e-07, 0.0763572, 0.0943127, 0.0825968, 0.0734052, 0.0765793, 0.0305351, 0.0121083,
        0.00391802, 0.00722106, 1e-07, 1e-07, 1e-07, 1e-07, 1e-07, 0 },
      { 0, 1e-07, 1e-07, 0.111518, 0.0960134, 0.128118, 0.0622588, 0.0360153, 0.0130845,
        0.0106838, 1e-07, 1e-07, 1e-07, 1e-07, 1e-07, 1e-07, 0 },
      { 0, 1e-07, 1e-07, 0.173913, 0.120973, 0.121418, 0.121403, 0.0548894, 0.0436284,
        0.142857, 1e-07, 1e-07, 1e-07, 1e-07, 1e-07, 1e-07, 0 },
      { 0, 0, 0, 0, 0, 0.232639, 0.0972222, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } };
 
  for ( int i = 0; i < 17; i++ )
  {
    for ( int j = 0; j < 17; j++ ) { HisPDF[i][j] = HisPDFtmp[i][j]; }
  }
}
 
void EvtD0toKpietaPlot::initProbMax() { noProbMax(); }
 
void EvtD0toKpietaPlot::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 EvtD0toKpietaPlot::FindXBin( double mass2 ) {
  if ( mass2 < Xmin ) { return 0; }
  else if ( mass2 >= Xmax ) { return 16; }
  else { return int( ( mass2 - Xmin ) / Xwid ) + 1; }
}
 
int EvtD0toKpietaPlot::FindYBin( double mass2 ) {
  if ( mass2 < Ymin ) { return 0; }
  else if ( mass2 >= Ymax ) { return 16; }
  else { return int( ( mass2 - Ymin ) / Ywid ) + 1; }
}