Thanks for responding! Is it obvious why in your example, gg→g̃ barg̃ , ( where NN->SS) , the reverse reaction (SS->NN) would not be allowed? The R- parity would not change, so CPT stays the same...
Assuming R-pairity and thus the creation/destruction of supersymmetric particles happens in pairs,
how is angular momentum conserved when a particle and its supersymmetric partner have different spin by 1/2?