A QCD Sum Rule Approach to the $s\to d\gamma$ Contribution to the ${\Omega }^{-}\to {\Xi }^{-}\gamma$ Radiative Decay

Abstract

QCD sum rules are used to calculate the contribution of short-distance single-quark transition $s\to d\gamma$, to the amplitudes of the hyperon radiative decay, ${\Omega }^{-}\to {\Xi }^{-}\gamma$. We re-evaluate the Wilson coefficient of the effective operator responsible for this transition. We obtain a branching ratio which is comparable to the unitarity limit.

Comments: 15 pages, Revtex, 13 figures available as a uuencoded, gz-compressed ps file