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We calculate the electric dipole moments of the neutron and the Λ within the framework of heavy baryon chiral perturbation theory. They are induced by strong CP-violating terms of the effective Lagrangian in the presence of the vacuum angle θ₀. The construction of such a Lagrangian is outlined and we are able to give an estimate for θ₀.
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B. Borasoy (2000) studied this question.
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