Abstract
Abstract In this chapter we make a short introduction to an intriguing problem of the standard model of the strong and electroweak interactions: the ‘strong CP problem’. This problem might as well be called the ‘strong P problem’, because its crux is the possible presence in the strong-interaction Lagrangian of a P- and CF-violating term called the 0-term. We shall focus our attention on possible implications of the strong CP problem to model-building. Although the strong CP problem is, to a great extent, still an open question in particle physics, it is possible to construct models for the electroweak interaction which keep the strong CP problem at bay. The hope is that the strong CP problem may provide a clue to the ‘true’ model of CP violation.
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