Consider the case where (S_{l}(k)) has a single pole (resonance), but (k_{2}) is comparable with (k_{1}). Calculate

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Consider the case where \(S_{l}(k)\) has a single pole (resonance), but \(k_{2}\) is comparable with \(k_{1}\). Calculate \(\tan \delta_{l}\) and the equivalent of the Breit-Wigner formula in this more general case, \(\sigma_{l}(E)\).

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