The charge and mass symmetry breaking in the $KK\bar{K}$ system

TL;DR

This study uses Faddeev equations to analyze the $KKar{K}$ system, revealing how Coulomb forces and mass differences influence the binding energy and symmetry of the kaonic resonances near 1460 MeV.

Contribution

It provides a detailed three-body analysis of the $KKar{K}$ system, highlighting the effects of Coulomb interaction and mass symmetry breaking on the resonance properties.

Findings

Coulomb force increases binding energy by over 1 MeV.

Mass redistribution effects are negligible, up to 6% correction.

Predicted masses for $K^{0}$ and $K^{+}$ resonances around 1461-1469 MeV.

Abstract

In the framework of the Faddeev equations in configuration space, we investigate the $K$(1460) meson as a resonant state of the $KK\bar{K}$ kaonic system. We perform calculations for the particle configurations $K^{0}K^{+}K^{-}$ and $K^{0}K^{+}\overline{{K}^{0}}$ within two models: the $ABC $ model, in which all three particles are distinguishable, and the $AAC$ model when two particles are identical. The models differ in their treatment of the kaon mass difference and the attractive Coulomb force between the $K^{+}K^{-}$ pair. We found that the Coulomb shift adds over 1 MeV to the three-body binding energy. The expected correction to the binding energy due to mass redistribution from $AA$ to $AB$ is found to be negligible, up to a maximum of 6\% of the relative mass correction. At the same time, the symmetry of the wave function is distorted depending on the mass ratio value. We found that the repulsive $KK$ interaction plays essential role in the binding energy of the $KK\bar K$ system and report the mass of 1461.8 or 1464.1 MeV for the neutral $K^{0}$(1460) and 1466.5 or 1468.8 MeV for the charged $K^{+}$(1460) resonances, respectively, depending on the parameter sets for $KK$ and $K\bar{K}$ interactions.