We make some quark-model and current-algebra estimates of the cross sections for an SU(5) monopole to catalyze proton decay into the channels $e^{+}{\pi }^0$ and $e^{+}+\mathrm{nonstrange}\mathrm{mesons}$.

• Received 22 September 1985

DOI:https://doi.org/10.1103/PhysRevLett.55.2555