We point out that the interactions of goldstinos with matter supermultiplets
are a potential source of flavour violation, if fermion and sfermion mass
matrices are not aligned and supersymmetry is spontaneously broken at a low
scale. We study the impact of those couplings on low-energy processes such as
\mu \to e \gamma, \mu \to eee, K \to \mu^+ \mu^-, K-\ov{K} transitions and
analogous ones. Moreover, we address the issue of flavour violation in
low-energy processes involving two goldstinos and two matter fermions,
generalizing earlier results obtained in the flavour-conserving case.Comment: 22 LaTeX pages, 2 ps figures, uses epsfig and axodraw; typos
corrected, to appear in Nucl. Phys.
