$n-\bar{n}$ Oscillation in $S^1\mathrm{/}{Z}_2\times Z_2^{\mathrm{\prime }}$ Orbifold $SU(5)$ GUT

We explore the possibility of $B$ and $B-L$ violating processes, specifically proton decay and neutron-antineutron oscillation, using explicit realization of operators in the $SU(5)$ grand unified theory with an $S^1\mathrm{/}{Z}_2\times Z_2^{\mathrm{\prime }}$ orbifold space.