The intrinsic coupling in integrable quantum field theories

J. Balog, M. Niedermaier, F. Niedermayer, A. Patrascioiu, E. Seiler, P. Weisz

Research output: Contribution to journalArticle

22 Citations (Scopus)


The intrinsic 4-point coupling, defined in terms of a truncated 4-point function at zero momentum, provides a well-established measure for the interaction strength of a QFT. We show that this coupling can be computed non-perturbatively and to high accuracy from the form factors of an (integrable) QFT. The technique is illustrated and tested with the Ising model, the XY-model and the O(3) nonlinear sigma-model. The results are compared to those from high precision lattice simulations.

Original languageEnglish
Pages (from-to)614-670
Number of pages57
JournalNuclear Physics B
Issue number3
Publication statusPublished - Sep 11 2000


  • Bethe ansatz
  • Form factors
  • Integrable systems
  • Ising model
  • O(3) sigma-model
  • XY-model

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Balog, J., Niedermaier, M., Niedermayer, F., Patrascioiu, A., Seiler, E., & Weisz, P. (2000). The intrinsic coupling in integrable quantum field theories. Nuclear Physics B, 583(3), 614-670.