Abstract
The introduction of scalar interactions in the Kemmer-Duffin-Petiau equation induces the appearance of Darwin terms in the effective Klein-Gordon equation that resemble the Ericson-Ericson Lorentz-Lorenz effect in pion-nucleus scattering. The ${\ensuremath{\xi}}_{\ensuremath{\pi}}$ parameter turns out to be ${\ensuremath{\xi}}_{\ensuremath{\pi}}$\ensuremath{\sim}2 in agreement with recent calculations of the effect.
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