The isospin-3 three-particle K-matrix at NLO in ChPT

Jorge Baeza-Ballesteros, Johan Bijnens, Tomáš Husek, Fernando Romero-López, Stephen R. Sharpe, Mattias Sjö

Research output: Contribution to journalArticlepeer-review


The three-particle K-matrix, Kdf,3 , is a scheme-dependent quantity that parametrizes short-range three-particle interactions in the relativistic-field-theory three-particle finite-volume formalism. In this work, we compute its value for systems of three pions at maximal isospin through next-to-leading order (NLO) in Chiral Perturbation Theory (ChPT). We compare the values to existing lattice QCD results and find that the agreement between lattice QCD data and ChPT in the first two coefficients of the threshold expansion of Kdf,3 is significantly improved with respect to leading order once NLO effects are incorporated.

Original languageEnglish
Article number187
JournalJournal of High Energy Physics
Issue number5
Publication statusPublished - 2023 May

Subject classification (UKÄ)

  • Subatomic Physics

Free keywords

  • Chiral Lagrangian
  • Hadronic Spectroscopy
  • Lattice QCD
  • Structure and Interactions


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