Λ-Λ interaction and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow /><mml:mrow><mml:mi>Λ</mml:mi><mml:mi>Λ</mml:mi></mml:mrow><mml:mrow><mml:mi /><mml:mi /><mml:mn>6</mml:mn></mml:mrow></mml:msubsup></mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:math>

Afnan, I.R.; Gibson, Benjamin F.

doi:10.1103/physrevc.67.017001

Cited by 47 publications

(60 citation statements)

References 14 publications

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“…We note that, contrary to what it seems to be implied in Ref. [30], the coupling between the ⌳⌳ and ⌶N channels is important even when the interaction is weak, as it is the case of the NSC97e potential used here which produces a scattering length of about −0.5 fm. Actually, in Refs.…”

Section: Resultsmentioning

confidence: 40%

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ΛΛbond energy from the Nijmegen potentials

2004

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The ⌳⌳ bond energy ⌬B ⌳⌳ in ⌳⌳ hypernuclei is obtained from a G-matrix calculation which includes the coupling between the ⌳⌳, ⌶N, and ⌺⌺ channels, as well as the effect of Pauli blocking to all orders. The Nijmegen NSC97e model is used as bare baryon-baryon interaction in the strangeness S = −2 sector. The ⌳⌳-⌶N coupling increases substantially the bond energy with respect to the uncoupled ⌳⌳ case. However, the additional incorporation of the ⌺⌺ channel, which couples simultaneously to ⌳⌳ and ⌶N states, has a surprisingly drastic effect and reduces the bond energy down to a value closer to that obtained in an uncoupled calculation. We find that a complete treatment of Pauli blocking reduces the repulsive effect on the bond energy to about half of what was claimed before.

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Section: Resultsmentioning

confidence: 40%

“…In fact, the important role of the coupling to ⌺⌺ states has been recently pointed out in Ref. [30] and explicitly worked out for the Nijmegen interactions in the variational calculation of Ref. [31].…”

Section: Introductionmentioning

confidence: 99%

ΛΛbond energy from the Nijmegen potentials

2004

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“…Generally, it is an important problem how to take account of other states beyond the 1s shell. It was shown that the ΛΛ − ΞN coupling contributes to the 6 ΛΛ He binding energy sizably (though not so much for realistic interactions) [16,17,18], despite that all the nucleonic 1s states are occupied. In our approach, highly-excited components are renormalized into the effective ΛΛ interactions in some approximate way, as commented in the end of Subsec.…”

Section: A Modelmentioning

confidence: 99%

“…Theoretically, the ΛΛ − ΞN coupling in ΛΛ hypernuclei 1 have been considered by several groups [6,12,14,15,16,17,18,19]. Mostly, hypernuclei observed experimentally have been studied, namely, 6 ΛΛ He [12,16,17,18],…”

Section: Introductionmentioning

confidence: 99%

Hyperonic mixing in five-baryon double-strangeness hypernuclei in a two-channel treatment

Lanskoy

Yamamoto

2004

Phys. Rev. C

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Properties of hypernuclei 5ΛΛ H and 5 ΛΛ He are studied in a two-channel approach with explicit treatment of coupling of channels 3 Z + Λ + Λ and α + Ξ. Diagonal ΛΛ and coupling ΛΛ − ΞN interactions are derived within G-matrix procedure from Nijmegen meson-exchange models. Bond energy ∆BΛΛ in 5 ΛΛ He exceeds significantly that in 5 ΛΛ H due to the channel coupling. Diagonal Ξα attraction amplifies the effect, which is sensitive also to Λ-core interaction. The difference of the ∆BΛΛ values can be an unambiguous signature of the ΛΛ − ΞN coupling in ΛΛ hypernuclei. However, improved knowledge of the hyperon-nucleus potentials is needed for quantitative extraction of the coupling strength from future data on the ΛΛ hypernuclear binding energies.

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“…This technique minimizes off-shell effects since at very low momentum the neutron is practically a spectator in the deuteron. Another method (Afnan et al, , 2003Bissey et al, 2001;Petratos et al, 2006) is to perform deep inelastic scattering from 3 He and 3 H at very high x.…”

Section: G the Neutron Structure Functionmentioning

confidence: 99%

Nucleon and pion distribution functions in the valence region

2010

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We provide an experimental and theoretical perspective on the behavior of unpolarized distribution functions for the nucleon and pion on the valence-quark domain; namely, Bjorken-x > ∼ 0.4. This domain is key to much of hadron physics; e.g., a hadron is defined by its flavor content and that is a valence-quark property. Furthermore, its accurate parametrization is crucial to the provision of reliable input for large collider experiments. We focus on experimental extractions of distribution functions via electron and muon inelastic scattering, and from Drell-Yan interactions; and on theoretical treatments that emphasize an explanation of the distribution functions, providing an overview of major contemporary approaches and issues. Valence-quark physics is a compelling subject, which probes at the heart of our understanding of the Standard Model. There are numerous outstanding and unresolved challenges, which experiment and theory must confront. In connection with experiment, we explain that an upgraded Jefferson Lab facility is well-suited to provide new data on the nucleon, while a future electron ion collider could provide essential new data for the mesons. There is also great potential in using Drell-Yan interactions, at FNAL, J-PARC and GSI, to push into the large-x domain for both mesons and nucleons. We argue furthermore that explanation, in contrast to modeling and parametrization, requires a widespread acceptance of the need to adapt theory: to the lessons learnt already from the methods of nonperturbative quantum field theory; and a fuller exploitation of those methods. * Electronic address: holt@anl.gov † Electronic address: cdroberts@anl.gov

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Λ-Λ interaction andΛΛ6He

Cited by 47 publications

References 14 publications

ΛΛbond energy from the Nijmegen potentials

ΛΛbond energy from the Nijmegen potentials

Hyperonic mixing in five-baryon double-strangeness hypernuclei in a two-channel treatment

Nucleon and pion distribution functions in the valence region

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