G4MesonSplitter.cc

Go to the documentation of this file.

//
// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
// * conditions of the Geant4 Software License,  included in the file *
// * LICENSE and available at  http://cern.ch/geant4/license .  These *
// * include a list of copyright holders.                             *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.  Please see the license in the file  LICENSE  and URL above *
// * for the full disclaimer and the limitation of liability.         *
// *                                                                  *
// * This  code  implementation is the result of  the  scientific and *
// * technical work of the GEANT4 collaboration.                      *
// * By using,  copying,  modifying or  distributing the software (or *
// * any work based  on the software)  you  agree  to acknowledge its *
// * use  in  resulting  scientific  publications,  and indicate your *
// * acceptance of all terms of the Geant4 Software license.          *
// ********************************************************************
//
#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++;
    *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;
}