Recent soft-core baryon–baryon interactions

Rijken, Th. A.; Yamamoto, Yasuo

doi:10.1016/j.nuclphysa.2007.12.016

Cited by 8 publications

(3 citation statements)

References 28 publications

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“…Comparing our results at NLO with those at LO one notices that the former provides more attraction in the 1 S 0 partial wave but significantly less in the coupled 3 S 1 -3 D 1 partial wave. Indeed the contribution predicted at NLO for this state is also much smaller than the values suggested by the Jülich meson-exchange potentials and other phenomenological models [15,17,18,22]. We believe that this has to do with a characteristic feature of our EFT interactions that was already emphasized in Ref.…”

Section: Resultsmentioning

confidence: 56%

“…Microscopic models of the YN interaction, fitted to ΛN and ΣN scattering data, often fail to produce a repulsive Σ -nuclear potential. Specifically, for models based on meson-exchange dynamics it is rather difficult to obtain such a repulsion as is witnessed by results of G-matrix calculations for various generations of the Nijmegen YN potential [15][16][17][18]. Only the most recent version [19] could overcome this difficulty [20,21] -but at the expense of a noticeable increase in the achieved χ 2 .…”

Section: Introductionmentioning

confidence: 99%

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A study of hyperons in nuclear matter based on chiral effective field theory

Haidenbauer

Meißner

2015

Nuclear Physics A

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The in-medium properties of a hyperon-nucleon potential, derived within chiral effective field theory and fitted to ΛN and ΣN scattering data, are investigated. Results for the single-particle potentials of the Λ and Σ hyperons in nuclear matter are reported, based on a conventional G-matrix calculation. The Σ-nuclear potential is found to be repulsive, in agreement with phenomenological information. A weak Λ-nuclear spin-orbit interaction can be achieved by an appropriate adjustment of a low-energy constant corresponding to an antisymmetric ΛN-ΣN spin-orbit interaction that arises at next-to-leading order in the effective field theory approach.

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Section: Resultsmentioning

confidence: 56%

Section: Introductionmentioning

confidence: 99%

A study of hyperons in nuclear matter based on chiral effective field theory

Haidenbauer

Meißner

2015

Nuclear Physics A

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“…Several theoretical analyses have also suggested that a repulsive component in the Σ-nucleus potentials is needed to reproduce the observed spectra of (π − , K + ) reactions on nuclear targets [5][6][7]. This repulsion originates from the ΣN T = 3/2, 3 S 1 channel, of which state corresponds to a quark Pauli-forbidden state in the baryon-baryon system [8,9], and it is a candidate for the appearance of quark degrees of freedom in nuclear physics.…”

Section: Introductionmentioning

confidence: 99%

Coulomb-assisted -nucleus bound states in the () reaction

Harada

Hirabayashi

2009

Nuclear Physics A

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We study a production of Coulomb-assisted Σ − -nucleus bound states by nuclear (K − , π + ) reactions within a distorted-wave impulse approximation, so as to examine several types of the Σ-nucleus potentials that are consistent with the available Σ − atomic X-ray data and nuclear (π − , K + ) data. We theoretically demonstrate the inclusive (K − , π + ) spectra of the Σ − unstable bound states on 28 Si, 58 Ni, and 208 Pb targets at incident K − lab momenta p K = 400-800 MeV/c.The results show that the near-recoilless (K − , π + ) reaction on the 58 Ni target gives a clear candidate to confirm properties of the Σ-nucleus potentials having a repulsion inside the nuclear surface and an attraction outside the nucleus with a sizable absorption, whereas details of the repulsion of the potential at the nuclear center cannot be determined by the inclusive spectra. This is a promising attempt to extract properties of the Σ-nucleus potential in the nucleus at forthcoming J-PARC experiments, as a full complement to the analyses of the Σ − atomic and (π − , K + ) data.

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