https://doi.org/10.1140/epjc/s10052-021-09386-0
Regular Article - Theoretical Physics
The 
in resummed chiral effective field theory
1
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
Received:
4
February
2021
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
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