Probing multi-particle unitarity with the Landau equations

Miguel Correia, Amit Sever, Alexander Zhiboedov

Research output: Contribution to journalArticlepeer-review


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. Our analysis sheds new light on the complicated analytic structure of nonperturbative relativistic scattering amplitudes.

Original languageEnglish
Article number062
JournalSciPost Physics
Issue number3
StatePublished - Sep 2022


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