Regular Article - Theoretical Physics
The in resummed chiral effective field theory
Institut für Kernphysik and Cluster of Excellence PRISMA+, Johannes Gutenberg-Universität Mainz, 55128, Mainz, Germany
2 Institut für Theoretische Physik II, Ruhr-Universität Bochum, 44780, Bochum, Germany
3 Tbilisi State University, 0186, Tbilisi, Georgia
4 Helmholtz Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, 53115, Bonn, Germany
5 Institute for Advanced Simulation, Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, 52425, Jülich, Germany
Accepted: 25 June 2021
Published online: 6 July 2021
We study the unitarized meson–baryon scattering amplitude at leading order in the strangeness sector using time-ordered perturbation theory for a manifestly Lorentz-invariant formulation of chiral effective field theory. By solving the coupled-channel integral equations with the full off-shell dependence of the effective potential and applying subtractive renormalization, we analyze the renormalized scattering amplitudes and obtain the two-pole structure of the resonance. We also point out the necessity of including higher-order terms.
© The Author(s) 2021
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Funded by SCOAP3