New insights into the nature of the Λ(1380) and Λ(1405) resonances away from the SU(3) limit

Feng-Kun Guo; Yuki Kamiya; Maxim Mai; Ulf-G. Meißner

Physics Letters B (Nov 2023)

New insights into the nature of the Λ(1380) and Λ(1405) resonances away from the SU(3) limit

Feng-Kun Guo,
Yuki Kamiya,
Maxim Mai,
Ulf-G. Meißner

Affiliations

Feng-Kun Guo: CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China; School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China; Peng Huanwu Collaborative Center for Research and Education, Beihang University, Beijing 100191, China
Yuki Kamiya: Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, D-53115 Bonn, Germany; Corresponding author.
Maxim Mai: Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, D-53115 Bonn, Germany; Institute for Nuclear Studies and Department of Physics, The George Washington University, Washington, DC 20052, USA
Ulf-G. Meißner: Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, D-53115 Bonn, Germany; Institute for Advanced Simulation, Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425 Jülich, Germany; Tbilisi State University, 0186 Tbilisi, Georgia

Journal volume & issue: Vol. 846
p. 138264

Abstract

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Starting from the SU(3) limit, we consider the nature of the dynamically generated resonances Λ(1380), Λ(1405) and Λ(1680) as the pion and kaon masses are tuned to their physical values. We show that the accidental symmetry of the two octets due to the leading order Weinberg-Tomozawa term is broken by the next-to-leading order terms. Most interestingly, we observe an interchange of the two trajectories of the Λ(1380) and the Λ(1405) away from the SU(3) limit at next-to-leading order. This remarkable phenomenon can be investigated using lattice QCD calculations that start from the SU(3) limit.

Published in Physics Letters B

ISSN: 0370-2693 (Print); 1873-2445 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Physics
Website: http://www.journals.elsevier.com/physics-letters-b/

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