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082 _ _ |a 530
100 1 _ |a Haidenbauer, Johann
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245 _ _ |a On the structure in the ΛN cross section at the ΣN threshold
260 _ _ |a Bristol [u.a.]
|c 2021
|b IOP Publ.
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520 _ _ |a 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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536 _ _ |a DFG project 196253076 - TRR 110: Symmetrien und Strukturbildung in der Quantenchromodynamik (196253076)
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700 1 _ |a Meißner, Ulf-G.
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773 _ _ |a 10.1088/1674-1137/ac0e89
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|t Chinese physics / C
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