Chiral SU(3) Dynamics and Antikaon-Nuclear quasibound States

TL;DR

This paper explores the potential existence of antikaon-nuclear quasibound states by analyzing low-energy KbarN interactions using chiral SU(3) dynamics, considering various nuclear sizes and decay effects.

Contribution

It provides a detailed theoretical study of antikaon binding in nuclei from light to heavy, incorporating chiral SU(3) dynamics and p-wave effects, and estimates their binding energies and decay widths.

Findings

Quasibound states may exist with 60-100 MeV binding energies.

Decay widths are substantial, comparable to binding energies.

States are more likely in lighter to medium nuclei.

Abstract

Recent developments are summarised concerning low-energy KbarN interactions as they relate to the possible existence of antikaon-nuclear quasibound states. An exploratory study of antikaons bound to finite nuclei is performed, with emphasis on the evolution of such states from light to heavy nuclei (A = 16 - 208). The energy dependent, driving attractive KbarN interactions are constructed using the s-wave coupled-channel amplitudes involving the Lambda(1405) and resulting from chiral SU(3) dynamics, plus p-wave amplitudes dominated by the Sigma(1385). Effects of Pauli and short-range correlations are discussed. The decay width induced by K^-NN two-body absorption is estimated and found to be substantial. It is concluded that Kbar-nuclear quasibound states can possibly exist with binding energies ranging from 60 to 100 MeV, but with short life times corresponding to decay widths of the similar magnitudes.