Towards a nonperturbative construction of the S-matrix

Brian Henning, Hitoshi Murayama, Francesco Riva, Jedidiah O. Thompson, Matthew T. Walters

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)
21 Downloads (Pure)


We present a nonperturbative recipe for directly computing the S-matrix in strongly-coupled QFTs. The method makes use of spectral data obtained in a Hamiltonian framework and can be applied to a wide range of theories, including potentially QCD. We demonstrate the utility of this prescription in the specific example of the 2+1d O(N) model at large N, using energy eigenstates computed with Hamiltonian truncation to reproduce the full 2 → 2 scattering amplitude for arbitrary (complex) center-of-mass energy.

Original languageEnglish
Article number197
JournalJournal of High Energy Physics
Issue number5
Publication statusPublished - 25 May 2023


  • hep-th
  • hep-lat
  • hep-ph
  • Scattering Amplitudes
  • Field Theories in Lower Dimensions
  • Nonperturbative Effects

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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