Diquark-diquark correlations in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>S</mml:mi><mml:mn>0</mml:mn><mml:none /><mml:mprescripts /><mml:none /><mml:mn>1</mml:mn></mml:mmultiscripts><mml:mi>Λ</mml:mi><mml:mi>Λ</mml:mi></mml:math>potential

Fernández-Caramés, T.; Valcarce, A.; González, P.

doi:10.1103/physrevd.72.054008

Cited by 5 publications

(4 citation statements)

References 36 publications

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“…Our result for the ratio g ΛΛσ /g N N σ is half of the value found in Ref. [11], however, it qualitatively agrees with the one from NSC89 [4], which is g ΛΛσ /g N N σ = 0.58. The value we have obtained for the ΛΛσ coupling constant is small as compared to NN σ coupling constant and this implies that ΛΛ interaction is weak, since the sigma exchange gives the dominant contribution to this interaction in terms of OBE models.…”

Section: Discussionsupporting

confidence: 88%

“…In terms of OBE models for two-baryon interactions, the dominant contribution to ΛΛ interaction comes from the scalar ε(760) meson exchange [10,11]. The recent identification of 6 ΛΛ He and the measurement of the ΛΛ pair suggest that the binding energy of ΛΛ (∆B ΛΛ ≃ 1.0 MeV) is considerably smaller than the binding energy of NN [12].…”

Section: Introductionmentioning

confidence: 99%

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Scalar-meson–baryon coupling constants in QCD sum rules

et al. 2006

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The external-field QCD Sum Rules method is used to evaluate the coupling constants of the light-isoscalar scalar meson ("σ" or ǫ) to the Λ, Σ, and Ξ baryons. It is shown that these coupling constants as calculated from QCD Sum Rules are consistent with SU (3)-flavor relations, which leads to a determination of the F/(F + D) ratio of the scalar octet assuming ideal mixing: we find αs ≡ F/(F + D) = 0.55. The coupling constants with SU (3) breaking effects are also discussed.

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Section: Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Scalar-meson–baryon coupling constants in QCD sum rules

et al. 2006

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“…In Ref. [149], the ΛΛ interaction is examined in the chiral constituent quark model, which is tightly constrained by the description of the non-strange sector and the strange meson and baryon spectra. They found an attractive ΛΛ interaction due to the mechanism that the short-range repulsion from the Goldstone-boson and gluon exchanges are considerably reduced in the ΛΛ interaction in comparison with the NN interaction.…”

Section: G-matrix Calculationsmentioning

confidence: 99%

Baryon-Baryon Interactions in a Quark Model and their Applications to Few-Baryon Systems

Fujiwara

Suzuki

2008

Nuclear Physics News

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IntroductionStrong interactions acting between baryons, the nucleonnucleon (NN) interaction among others, play a basic role in building nuclei. Because of its importance enormous efforts, both experimental and theoretical, have hitherto been paid to understand the nature of the NN interaction. The quantum chromodynamics (QCD) [1] is nowadays believed to be a fundamental theory of the strong interaction. From this modern view, Yukawa's meson theory [2] for the nuclear force is regarded as an effective description of the interaction of the composite nucleons, governed by the strongly nonperturbative dynamics of quarks and gluons. A recent lattice QCD calculation [3] confirms this view by producing both the short-range repulsion and medium-range attraction for the three-quark plus three-quark (3q-3q) configuration. Further studies in this direction have to be made for a quantitative description of the nuclear force.The compositeness of baryons was exploited in the 1960s in a spin-flavor SU 6 quark model to understand their groundstate properties. It was in the late 1970s that the QCDinspired constituent quark model was initiated for the study of the NN interaction [4,5]. Here the dynamics of the 3q-3q system was formulated in a microscopic theory called the resonating-group method (RGM). The inputs needed in the RGM are a quark-quark potential and a wave function ansatz for the baryons. The asymptotic freedom of QCD and the color confinement of the baryons are important ingredients to be reflected in the quark-quark potential. The former is modeled by the color analogue of the Fermi-Breit (FB) interaction, that is, the dominant one-gluon exchange interaction, and the latter is expressed by a phenomenological confinement potential that is assumed to be flavor independent. It has become vital to supplement the mesonic degrees of freedom for a realistic description of the medium-and longranged parts of the baryon-baryon interactions.The quark-model baryon-baryon interaction has been extended by the Kyoto-Niigata group [6] to cover all pairs of

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“…The ΛΛ BE B ΛΛ was determined from 6 ΛΛ He suggesting that effective ΛΛ interaction is considerably weaker than thought earlier. Baryon-baryon interactions for N, Λ, Σ and Ξ were studied by the Nijmegen group [149] and in chiral quark model [150]. Double Λ hypernuclei were studied in the relativistic mean-field theory and in the 4B model: x +α +Λ +Λ, where x is n, p, d, t, 3 He or α.…”

Section: Is There An End In Sight For Few Body Research?mentioning

confidence: 99%