Emergence of kaonium as a sharp resonance in photon-photon to meson-meson cross-sections
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2025
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| author | Beygi, Alireza Klevansky, S. P. Lemmer, R. H. |
| author_facet | Beygi, Alireza Klevansky, S. P. Lemmer, R. H. |
| contents | 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 $γγ\to π^0 π^0$ or $γγ\to π^0 η$. The latter process is particularly striking: the peak at the kaonium resonance energy is highly pronounced, with the ratio of the cross-sections $σ(γγ\to π^0 η) / σ(γγ\to π^0 π^0) \approx 9$. 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2511_04392 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Emergence of kaonium as a sharp resonance in photon-photon to meson-meson cross-sections Beygi, Alireza Klevansky, S. P. Lemmer, R. H. High Energy Physics - Phenomenology Nuclear Theory 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 $γγ\to π^0 π^0$ or $γγ\to π^0 η$. The latter process is particularly striking: the peak at the kaonium resonance energy is highly pronounced, with the ratio of the cross-sections $σ(γγ\to π^0 η) / σ(γγ\to π^0 π^0) \approx 9$. 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. |
| title | Emergence of kaonium as a sharp resonance in photon-photon to meson-meson cross-sections |
| topic | High Energy Physics - Phenomenology Nuclear Theory |
| url | https://arxiv.org/abs/2511.04392 |