Abstract
We consider the 2\to 22→2 scattering amplitude of identical massive particles. We identify the Landau curves in the multi-particle region 16m^2 \leq s, t < 36m^216m2≤s,t<36m2. We systematically generate and select the relevant graphs and numerically solve the associated Landau equations for the leading singularity. We find an infinite sequence of Landau curves that accumulates at finite ss and tt on the physical sheet. We expect that such accumulations are generic for s,t > 16m^2s,t>16m2. Our analysis sheds new light on the complicated analytic structure of nonperturbative relativistic scattering amplitudes.
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