Abstract
Vacuum structure in SQCD is analysed. It is pointed out, in particular, that quantum mechanical tunnelling in the massive theory is mediated by pure instantons and zero classical scalar fields due to the trivial topological structure of the set of minima of the classical potential. In the massless theory, on the other hand, the set of minima has a non-trivial topology, as a result of which an instanton has to be accompanied by a topologically non-trivial scalar field in order to mediate the tunnelling. Indeed, this configuration has an infinite action if a mass term is added, and its tunnelling is completely suppressed unlike that of the trivial scalar configuration.
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