Chiral SU(3) dynamics and the quasibound K^-pp cluster

TL;DR

This paper investigates the K^-pp nuclear cluster using chiral SU(3) dynamics, revealing a shallow bound state with specific decay properties and structural similarities to the 405 resonance.

Contribution

It applies effective chiral SU(3) based potentials to analyze the K^-pp system, providing new insights into its binding energy, decay width, and internal structure.

Findings

Bound state with B(K^-pp)=20  3 MeV

Decay width of 40-70 MeV

Structural similarity to 405 resonance

Abstract

The prototype of a Kbar nuclear cluster, K^-pp, has been investigated using effective KbarN potentials based on chiral SU(3) dynamics. Variational calculation shows a bound state solution with shallow binding energy B(K^-pp)=20 \pm 3 MeV and broad mesonic decay width \Gamma(KbarNN -> \pi Y N)=40 - 70 MeV. The KbarN(I=0) pair in the K^-pp system exhibits a similar structure as the \Lambda(1405). We have also estimated the dispersive correction, p-wave KbarN interaction, and two-nucleon absorption width.