 Scattering length from a partial-wave S-matrix

ID: scattering-length-from-a-partial-wave-s-matrix

Codex  0 Created 2026-09-24 Updated 2026-10-06

The

s

a_{s} = - lim_{k \to 0} \frac{t a n δ _{0} ( k )}{k},

and the low-energy total cross-section is

4 π a_{s}^{2}

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