  We revisit the hyperon weak radiative decays in the framework of the
non-relativistic constituent quark model. This study confirms the nonlocal
feature of the hyperon weak radiative transition operators which are dominated
by the pole terms, and an overall self-consistent description of the available
experimental data for the Cabibbo-favored hyperon weak radiative decays is
achieved. It provides a natural mechanism for evading the Hara theorem, where
sizeable parity-violating contributions can come from the intermediate orbital
excitations. Cancellations between pole terms also explain significant SU(3)
flavor symmetry breaking manifested by the experimental data. We also discuss
several interesting selection rules arising from either the electromagnetic or
the weak interaction vertices. These features suggest nontrivial relations
among different hyperon decays.
