We demonstrate that in the effective Hamiltonian for the process $s+u\to u+d+\gamma$, one can identify two types of local four-quark operators; type I operators violate Hara's theorem and type II respect it. By an explicit calculation we demonstrate that the quark-quark bremsstrahlung process generates both types of operators but only type I survive in the SU(3) limit.

• Received 7 February 1983

DOI:https://doi.org/10.1103/PhysRevD.28.2317