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Résumé |
Unitarity puts stringent constraints on the analytic structure of nonperturbative relativistic scattering
amplitudes. We consider the 2→2 scattering amplitude of identical massive particles. We identify the Landau
curves in the multi-particle region 16m2≤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 s and t on the physical sheet. We expect that such
accumulations are generic for s,t>16m2. |
