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We estimate the long distance (LD) contribution to the magnetic part of the$s \to d\gamma$ transition using the Vector Meson Dominance approximation$(V=\rho,\omega,\psi_i)$. We find that this contribution may be significantlylarger than the short distance (SD) contribution to $s \to d\gamma$ and couldpossibly saturate the present experimental upper bound on the $\Omega^-\to\Xi^-\gamma$ decay rate, $\Gamma^{\rm MAX}_{\Omega^-\to \Xi^-\gamma} \simeq3.7\times10^{-9}$eV. For the decay $B_s \to B^*_d\gamma$, which is driven by $s\to d\gamma$ as well, we obtain an upper bound on the branching ratio $BR(B_s\to B_d^*\gamma)<3\times10^{-8}$ from $\Gamma^{\rm MAX}_{\Omega^-\to\Xi^-\gamma}$. Barring the possibility that the Quantum Chromodynamicscoefficient $a_2(m_s)$ be much smaller than 1, $\Gamma^{\rm MAX}_{\Omega^-\to\Xi^-\gamma}$ also implies the approximate relation $\frac{2}{3} \sum_i\frac{g^2_{\psi_i}(0)}{m^2_{\psi_i}} \simeq \frac{1}{2}\frac{g^2_\rho(0)}{m^2_\rho} + \frac{1}{6}\frac{g^2_\omega(0)}{m^2_\omega}$.This relation agrees quantitatively with a recent independent estimate of thel.h.s. by Deshpande et al., confirming that the LD contributions to $b \tos\gamma$ are small. We find that these amount to an increase of $(4\pm2)\%$ inthe magnitude of the $b \to s \gamma$ transition amplitude, relative to the SDcontribution alone.Comment: 16 pages, LaTeX fil

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

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