G4MesonSplitter.cc

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#include "G4MesonSplitter.hh"
#include "Randomize.hh"

G4bool G4MesonSplitter::SplitMeson(G4int PDGcode, G4int* aEnd, G4int* bEnd)
{
  G4bool result = true;
  G4int absPDGcode = std::abs(PDGcode);
  if (absPDGcode >= 1000) return false;
  if(absPDGcode == 22)                   // For gamma -> 4 (u ubar) + 1 (d dbar)
  {
    G4int it=1;
    if(G4UniformRand()<0.8) it++;   // Uzhi Oct. 2016 0.5 -> 0.8
    *aEnd = it;
    *bEnd = -it;
  }
  else
  {
    G4int heavy =  absPDGcode/100;
    G4int light = (absPDGcode%100)/10;
    G4int anti  = 1 - 2*(std::max(heavy, light)%2);
    if (PDGcode < 0 ) anti = -anti;
    heavy *=  anti;
    light *= -anti;
    if ( anti < 0) G4SwapObj(&heavy, &light);
    *aEnd = heavy;
    *bEnd = light;
  }
  return result;
}