Journal Article

FZJ-2021-03674

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png On the structure in the ΛN cross section at the ΣN threshold

Haidenbauer, J. (Corresponding author)FZJ* ; Meißner, U.-G.FZJ*

2021
IOP Publ. Bristol [u.a.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/28846  doi:10.1088/1674-1137/ac0e89

Abstract: The complexity of threshold phenomena is exemplified on a prominent and long-known case - the structure in the $\Lambda p$ cross section (invariant mass spectrum) at the opening of the $\Sigma N$ channel. The mass splitting between the $\Sigma$ baryons together with the angular momentum coupling in the $^3S_1$- $^3D_1$ partial wave imply that, in principle, up to six channels are involved. Utilizing hyperon-nucleon potentials that provide an excellent description of the available low-energy $\Lambda p$ and $\Sigma N$ scattering data, the shape of the resulting $\Lambda p$ cross section is discussed and the poles near the $\Sigma N$ threshold are determined. Evidence for a strangeness $S=-1$ dibaryon is provided, in the form of a (unstable) $\Sigma N$ bound state in the vicinity of the $\Sigma N$ threshold. Predictions for level shifts and widths of $\Sigma^-p$ atomic states are given.

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Contributing Institute(s):

1. Theorie der Starken Wechselwirkung (IAS-4)
2. Theorie der starken Wechselwirkung (IKP-3)

Research Program(s):

1. 5111 - Domain-Specific Simulation Data Life Cycle Labs (SDLs) and Research Groups (POF4-511) (POF4-511)
2. DFG project 196253076 - TRR 110: Symmetrien und Strukturbildung in der Quantenchromodynamik (196253076) (196253076)

Appears in the scientific report 2021

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; Nationallizenz ; SCOAP3 sponsored Journal ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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