CoreSimTrack.cc

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#include "SimDataFormats/Track/interface/CoreSimTrack.h"

float CoreSimTrack::charge()const { 
  return float(CoreSimTrack::chargeValue(thePID)/3.);
}


int CoreSimTrack::chargeValue(const int& Id)const{

  
  //...Purpose: to give three times the charge for a particle/parton.

  //      ID     = particle ID
  //      hepchg = particle charge times 3

  int kqa,kq1,kq2,kq3,kqj,irt,kqx,kqn;
  int hepchg;


  int ichg[109]={-1,2,-1,2,-1,2,-1,2,0,0,-3,0,-3,0,-3,0,
-3,0,0,0,0,0,0,3,0,0,0,0,0,0,3,0,3,6,0,0,3,6,0,0,-1,2,-1,2,-1,2,0,0,0,0,
-3,0,-3,0,-3,0,0,0,0,0,-1,2,-1,2,-1,2,0,0,0,0,
-3,0,-3,0,-3,0,3,3,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};


  //...Initial values. Simple case of direct readout.
  hepchg=0;
  kqa=abs(Id);
  kqn=kqa/1000000000%10;
  kqx=kqa/1000000%10;
  kq3=kqa/1000%10;
  kq2=kqa/100%10;
  kq1=kqa/10%10;
  kqj=kqa%10;
  irt=kqa%10000;

  //...illegal or ion
  //...set ion charge to zero - not enough information
  if(kqa==0 || kqa >= 10000000) {

    if(kqn==1) {hepchg=0;}
  }
  //... direct translation
  else if(kqa<=100) {hepchg = ichg[kqa-1];}
  //... deuteron or tritium
  else if(kqa==100 || kqa==101) {hepchg = -3;}
  //... alpha or He3
  else if(kqa==102 || kqa==104) {hepchg = -6;}
  //... KS and KL (and undefined)
  else if(kqj == 0) {hepchg = 0;}
  //C... direct translation
  else if(kqx>0 && irt<100)
    {
      hepchg = ichg[irt-1];
      if(kqa==1000017 || kqa==1000018) {hepchg = 0;}
      if(kqa==1000034 || kqa==1000052) {hepchg = 0;}
      if(kqa==1000053 || kqa==1000054) {hepchg = 0;}
      if(kqa==5100061 || kqa==5100062) {hepchg = 6;}
    }
  //...Construction from quark content for heavy meson, diquark, baryon.
  //...Mesons.
  else if(kq3==0)
    {
      hepchg = ichg[kq2-1]-ichg[kq1-1];
      //...Strange or beauty mesons.
      if((kq2==3) || (kq2==5)) {hepchg = ichg[kq1-1]-ichg[kq2-1];}
    }
  else if(kq1 == 0) {
    //...Diquarks.
    hepchg = ichg[kq3-1] + ichg[kq2-1];
  }

  else{
    //...Baryons
    hepchg = ichg[kq3-1]+ichg[kq2-1]+ichg[kq1-1];
  }

  //... fix sign of charge
  if(Id<0 && hepchg!=0) {hepchg = -1*hepchg;}

  // cout << hepchg<< endl;
  return hepchg;
}



std::ostream & operator <<(std::ostream & o , const CoreSimTrack& t) 
{
    o << t.type() << ", ";
    o << t.momentum();
    return o;
}