Correlated two-pion exchange in the hyperon-nucleon system

Holinde, K.; Kim, Hyun-Chul; Reuber, A.; Speth, J.

doi:10.1016/0375-9474(94)00558-5

Nuclear Physics A

1995

DOI: 10.1016/0375-9474(94)00558-5

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Correlated two-pion exchange in the hyperon-nucleon system

K. Holinde

Hyun-Chul Kim

A. Reuber

et al.

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Cited by 4 publications

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“…Let us emphasize that this ratio reflects precisely the different wave function structure of N and Λ as a consequence of the SU(3) quark mass breaking. Our ratio is significantly bigger than the one predicted by some baryonic models [22] but in agreement with others [6,9,23,24]. Since all baryonic models give a reasonable description of the scarce NΛ data one cannot discriminate between them.…”

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confidence: 85%

Diquark-diquark correlations in theS01ΛΛpotential

2005

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We derive a ΛΛ potential from a chiral constituent quark model that has been successful in describing one, two and three nonstrange baryon systems. The resulting interaction at low energy is attractive at all distances due to the σ exchange term. The attraction allows for a slightly bound state just below the ΛΛ threshold. No short-range repulsive core is found. We extract the diquark-diquark contribution that turns out to be the most attractive and probable at small distances. At large distances the asymptotic behavior of the ΛΛ interaction provides a prediction for the σΛΛ coupling constant.

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supporting

confidence: 85%

Diquark-diquark correlations in theS01ΛΛpotential

2005

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Hypernuclei with meson-exchange hyperon-nucleon interactions

Speth

Krewald

et al. 1996

Nuclear Physics A

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Double-Λ hypernuclei and the nuclear medium effective ΛΛ interaction

1999

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We fit the 1 S 0 ΛΛ interaction in the nuclear medium to the masses of the experimentally known double−Λ hypernuclei: 6 ΛΛ He, 10 ΛΛ Be and 13 ΛΛ B. We derive this effective interaction from OBE Jülich ΛΛ-type potentials and using both HartreeFock and variational approaches. We find that the inclusion of ΛΛ correlations in the variational scheme leads to significant differences and a better understanding of the dynamical features of the system. We investigate the sensitivity of the binding energies and the mesonic decay widths of the above double−Λ hypernuclei to the ωΛΛ coupling and the form factor at the σΛΛ vertex. We also use this effective interaction to predict binding energies and pionic decay widths of heavier double−Λ hypernuclei, not discovered yet. Finally, we discard the existence of 1 S 0 ΛΛ bound states provided the ΛΛ − ΞN coupling can be neglected.

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Correlated two-pion exchange in the hyperon-nucleon system

Cited by 4 publications

References 7 publications

Diquark-diquark correlations in theS01ΛΛpotential

Diquark-diquark correlations in theS01ΛΛpotential

Hypernuclei with meson-exchange hyperon-nucleon interactions

Double-Λ hypernuclei and the nuclear medium effective ΛΛ interaction

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