New insights into the pole parameters of the Λ(1380), the Λ(1405) and the Σ(1385)

Sadasivan, Daniel; Mai, Maxim; Döring, M.; Meißner, Ulf-G; Amorim, F.; Klucik, J.; Lu, Jun-Xu; Geng, Li-Sheng

doi:10.3389/fphy.2023.1139236

New insights into the pole parameters of the Λ(1380), the Λ(1405) and the Σ(1385)

Journal Article · Mon Mar 27 00:00:00 EDT 2023 · Frontiers in Physics

DOI:https://doi.org/10.3389/fphy.2023.1139236· OSTI ID:2420557

Sadasivan, Daniel ^[1]; Mai, Maxim ^[2]; Döring, M. ^[3]; Meißner, Ulf-G ^[4]; Amorim, F. ^[5]; Klucik, J. ^[5]; Lu, Jun-Xu ^[6]; Geng, Li-Sheng ^[6]

Ave Maria University, FL (United States); Ave Maria Univ., Ave Maria, FL (United States)
Helmholtz Institute for Radiation and Nuclear Physics, Bonn (Germany); Bethe Center for Theoretical Physics (BCTP), Bonn (Germany); George Washington Univ., Washington, DC (United States)
George Washington Univ., Washington, DC (United States)
Helmholtz Institute for Radiation and Nuclear Physics, Bonn (Germany); Bethe Center for Theoretical Physics (BCTP), Bonn (Germany); Inst. for Nuclear Physics, Juelich (Germany). Inst. for Advanced Simulation; Jülich Center for Hadron Physics (Germany); Beihang University, Beijing (China)
Ave Maria University, FL (United States)
Beihang University, Beijing (China)

A coupled-channel S- and P-wave next-to-leading order chiral-unitary approach for strangeness S = –1 meson-baryon scattering is extended to include the new data from the KLOE and AMADEUS experiments as well as the Λπ mass distribution of the Σ(1385). The positions of the poles on the second Riemann sheet corresponding to the Σ(1385) pole and the Λ(1380) and Λ(1405) poles as well as the couplings of these states to various channels are calculated. We find that the resonance positions and branching ratios are on average determined with about 20% higher precision when including the KLOE and AMADEUS data. Additionally, for the first time, the correlations between the parameters of the poles are investigated and shown to be relevant. We also find that the Σ(1385) has negligible influence on the properties of the Λ states given the available data. Still, we identify isospin-1 cusp structures in the present solution in light of new measurements of π^±Λ line-shapes by the Belle collaboration.

View Accepted Manuscript (DOE)

Research Organization:: George Washington Univ., Washington, DC (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC05-06OR23177; SC0016582

OSTI ID:: 2420557

Journal Information:: Frontiers in Physics, Journal Name: Frontiers in Physics Vol. 11; ISSN 2296-424X

Publisher:: Frontiers Research FoundationCopyright Statement

Country of Publication:: United States

Language:: English

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New insights into the pole parameters of the Λ(1380), the Λ(1405) and the Σ(1385)

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