Abstract
Meson exchange current (MEC) contributions to pion double charge exchange (DCX) scattering at low energies are studied using soft pion theorems. A general form for the scattering amplitude on any scalar-isovector target is derived and applied as a constraint on the pion-nucleus DCX scattering amplitude. One result is an estimate that for a nuclear target with two excess valence neutrons, the MEC amplitude is less than ∼ 10 −2 fm. Second, a consistency condition on different MEC contributions is obtained, which exhibits the requirement of cancellations among these, and leads to a sum rule for evaluating all contributions of one type of exchanged meson. Consequences for vector meson exchange are discussed.
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