Nonlocalities and Fermi motion corrections in K− atoms

Garcı́a-Recio, C.; Nieves, J.; Oset, E.; Ramos, À.

doi:10.1016/s0375-9474(01)01328-8

Cited by 13 publications

(16 citation statements)

References 55 publications

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“…Apart from that, these interactions are interrelated with many other interesting areas, as listed in ref. [21], e.g., possible kaon condensation in neutron-proton stars [26,27,28,29], large yields of K − in heavy ions collisions [30,31], kaonic atoms [32] or non-zero strangeness content of the proton [33,34].…”

Section: Introductionmentioning

confidence: 99%

On the strangeness -1 S-wave meson-baryon scattering

2006

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We consider meson-baryon interactions in S-wave with strangeness −1. This is a nonperturbative sector populated by plenty of resonances interacting in several two-body coupled channels. We study this sector combining a large set of experimental data. The recent experiments are remarkably accurate demanding a sound theoretical description to account for all the data. We employ unitary chiral perturbation theory up to and including O(p 2 ) to accomplish this aim. The spectroscopy of our solutions is studied within this approach, discussing the rise from the pole content of the two Λ(1405) resonances and

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Section: Introductionmentioning

confidence: 99%

On the strangeness -1 S-wave meson-baryon scattering

2006

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“…The potential of Ref. [27] also leads to deeply bound K − states in medium and heavy nuclei which are bound by about [30][31][32][33][34][35][36][37][38][39][40] MeV but have a width of about 100 MeV [28]. Different steps in this problem were given in Ref.…”

Section: Introductionmentioning

confidence: 99%

“…On the theoretical side there have been further advances by looking at the p-wave contribution to the optical potential [35][36][37]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

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Chiral approach to antikaons- andp-wave interactions in dense nuclear matter

2006

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The properties of the antikaons in nuclear matter are investigated from a chiral unitary approach which incorporates the s-and p-waves of theKN interaction. To obtain the in-medium meson-baryon amplitudes we include, in a self-consistent way, Pauli blocking effects, meson self-energies corrected by nuclear short-range correlations and baryon binding potentials. We pay special attention to investigating the validity of the on-shell factorization, showing that it cannot be applied in the evaluation of the in-medium corrections to the p-wave amplitudes. In nuclear matter at saturation energy, the and develop an attractive potential of about −30 MeV, while the * pole remains at the free space value although its width gets sensibly increased to about 80 MeV. The antikaon also develops a moderate attraction that does not support the existence of very deep and narrow bound states, confirming the findings of previous self-consistent calculations.

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“…6), 7) The p-wave contribution to theKN optical potential has been found to be negligible for atoms. 8) However, heavy-ion collisions can test high-momentum kaons and, therefore, further partial-wave contributions.…”

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The In-Medium \barK NInteraction within a Chiral Unitary Approach

Tolós

Ramos

Oset

2007

Progress of Theoretical Physics Supplement

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The s-and p-wave contributions to theKN interaction in dense nuclear matter are obtained using a chiral unitary approach. We perform a self-consistent calculation of thē K self-energy including Pauli blocking effects, meson self-energies modified by short-range correlations and baryon binding potentials. We find that the on-shell factorization cannot be applied to evaluate the in-medium corrections to p-wave amplitudes. Furthermore, the Λ and Σ develop a mass shift of -30 MeV at saturation density while the Σ * width increases to 80 MeV. We conclude that no deep and narrowK bound states could be observed.Phenomenology of kaonic atoms shows that theK feels an attractive potential at low densities. This attraction results from the modified s-wave Λ(1405) resonance in the medium 1) due to Pauli blocking effects 2) combined with the self-consistent consideration of theK self-energy 3), 4) and the inclusion of self-energies of the mesons and baryons in the intermediate states. 5) Attraction of the order of -50 MeV at normal nuclear matter density ρ 0 = 0.17 fm −3 is obtained by different approaches, such as unitarizated extensions of chiral theories in coupled-channels. 5)Further studies of higher-partial waves have been performed recently. 6), 7) The p-wave contribution to theKN optical potential has been found to be negligible for atoms. 8) However, heavy-ion collisions can test high-momentum kaons and, therefore, further partial-wave contributions.In this paper we study theK properties in dense matter using a chiral unitary approach which incorporates s-and p-wave contributions to theKN interaction. We show that the on-shell factorization cannot be applied for p-waves in the medium. The self-energy of Λ(1115), Λ(1405), Σ(1195) and Σ * (1385) is also analyzed. 9)TheK self-energy in the nuclear medium and, hence, the spectral density are obtained by incorporating medium modifications to the coupled-channel Bethe-Salpeter equation using, as kernel, tree level chiral contributions. The s-wave contribution is derived from the lowest-order chiral lagrangian that couples the octet of pseudoscalar mesons to the octet of 1/2 + baryons, 10) while the p-wave amplitudes come mainly from the Λ, Σ and Σ * pole terms. 11) For meson-baryon scattering the kernel can be factorized on the mass shell in the loop functions. 10), 12) The loop function is then regularized by means of a cutoff or dimensional regularization. The formal result is * )

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Nonlocalities and Fermi motion corrections in K− atoms

Cited by 13 publications

References 55 publications

On the strangeness -1 S-wave meson-baryon scattering

On the strangeness -1 S-wave meson-baryon scattering

Chiral approach to antikaons- andp-wave interactions in dense nuclear matter

The In-Medium \barK NInteraction within a Chiral Unitary Approach

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