  R-parity and baryon number violating operators can be allowed in the
Supersymmetric Standard Model and thus lead to interesting baryon number
violating processes such as neutron-antineutron oscillations and baryogenesis
of the Universe via the decay of the lightest supersymmetric particle (LSP).
Adopting the LSP baryogenesis mechanism realized by the late decay of the
axino, we identify a single coupling lambda''_313 as a common origin for the
matter-antimatter asymmetry of the Universe as well as potentially observable
neutron-antineutron oscillation rates. From this, rather strong constraints on
the supersymmetry breaking masses and the axion decay constant are obtained.
The favoured parameter space of lambda''_313 ~ 0.1 and sub-TeV masses for the
relevant sparticles is readily accessible by the current and future LHC
searches.
