Emergence of kaonium as a sharp resonance in photon-photon to meson-meson cross-sections

TL;DR

This paper predicts that kaonium, a mesonic atom formed by K+ and K-, appears as a sharp resonance in photon-photon to meson-meson cross-sections, with potential experimental signatures near 992 MeV.

Contribution

The study demonstrates, using chiral perturbation theory, that kaonium manifests as a sharp resonance in specific photon-photon collision processes, providing new insights into exotic mesonic states.

Findings

Kaonium appears as a sharp resonance around 992 MeV.

The resonance significantly enhances the cross-section ratio for certain processes.

Detection of kaonium requires high experimental resolution due to its short lifetime.

Abstract

We calculate the binding energies of the hypothetical mesonic atom, $K^+ K^-$ (kaonium), using the $K^+ K^- \to K^+ K^-$ elastic scattering amplitude. Our findings are in line with previously reported results, which involve solving an eigenvalue equation of the Kudryavtsev-Popov type. Using chiral perturbation theory, we show that kaonium manifests itself as a sharp resonance around 992 MeV accompanying $f_0 (980)$ or $a_0 (980)$ in cross-sections for processes $\gamma \gamma \to \pi^0 \pi^0$ or $\gamma \gamma \to \pi^0 \eta$. The latter process is particularly striking: the peak at the kaonium resonance energy is highly pronounced, with the ratio of the cross-sections $\sigma (\gamma \gamma \to \pi^0 \eta) / \sigma (\gamma \gamma \to \pi^0 \pi^0) \approx 9$. Due to the short lifetime of kaonium ($\sim 10^{-18}$ s) and its small decay width ($\sim 0.4$ keV), direct detection of this exotic atom poses a significant challenge and requires high experimental resolution. However, we show that once the formation of kaonium is considered in the cross-section, a better fit to the available experimental data is obtained.