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Chiral approach to antikaon s- and p-wave interactions in dense nuclear matter
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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 the ${\bar K}N$ 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 $\Lambda$ and $\Sigma$ develop an attractive potential of about -30 MeV, while the $\Sigma^*$ 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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TOLÓS RIGUEIRO, Laura, RAMOS GÓMEZ, Àngels, OSET BAGUENA, Eulogio. Chiral approach to antikaon s- and p-wave interactions in dense nuclear matter. _Physical Review C_. 2006. Vol. 74, núm. 1, pàgs. 015203-1-015203-14. [consulta: 8 de gener de 2026]. ISSN: 0556-2813. [Disponible a: https://hdl.handle.net/2445/12209]