PT Journal
AU Baeza-Ballesteros, J
   Bijnens, J
   Husek, T
   Romero-Lopez, F
   Sharpe, SR
   Sjo, M
TI The three-pion K-matrix at NLO in ChPT
SO Journal of High Energy Physics
JI J. High Energy Phys.
PY 2024
BP 048
EP 43pp
VL 03
IS 3
DI 10.1007/JHEP03(2024)048
LA English
DE Chiral Lagrangian; Hadronic Spectroscopy; Structure and Interactions; Lattice QCD
AB The three-particle K-matrix, K-df,K-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 in all isospin channels through next-to-leading order in Chiral Perturbation Theory, generalizing previous work done at maximum isospin. We obtain analytic expressions through quadratic order (or cubic order, in the case of zero isospin) in the expansion about the three-pion threshold.
ER