message: at generator level, select only photons as neutral particles in isolation cone
diff: @@ -7562,6 +7562,7 @@ void AliAnaParticleIsolation::FillAcceptanceHistograms()
  //
  // Apply acceptance and energy/pt cut for particles in cone
  + // select only charged final particles and photons
  if(fSelectPrimariesInCone)
  {
  if( partInConeCharge > 0) // charged pT cut and acceptance
  @@ -7572,10 +7573,12 @@ void AliAnaParticleIsolation::FillAcceptanceHistograms()
  if(!GetReader()->GetFiducialCut()->IsInFiducialCut(fMomIso.Eta(),fMomIso.Phi(),kCTS)) continue ;
  }
  - else // neutrals E cut and acceptance
  + else // photons E cut and acceptance, discard hadrons (neutron, k0L, ...)
  {
  if( GetIsolationCut()->GetParticleTypeInCone() == AliIsolationCut::kOnlyCharged ) continue;
  + if( partInConePDG != 22 ) continue; // just photons
  +
  if( partInConeE <= minECalo ) continue;
  if(!GetReader()->GetFiducialCut()->IsInFiducialCut(fMomIso.Eta(),fMomIso.Phi(),GetCalorimeter())) continue ;
  