The Search for $K_L \rightarrow π^0π^0γγ$ and $K_L\rightarrow π^0π^0X$ where $X\rightarrow 2γ$ at the KOTO Experiment
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arXiv
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| Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| author | Redeker, J. Lin, C. Wah, Y. W. Ahn, J. K. Gonzalez, M. Hanai, K. Hsiung, Y. B. Kato, T. Kim, E. J. Komatsubara, T. K. Kotera, K. Lee, S. K. Lim, G. Y. Matsumura, T. Nanjo, H. Nomura, T. Nunes, T. Ono, K. Shiomi, K. Shiraishi, R. Tajima, Y. Tung, Y. C. Watanabe, H. Wu, T. Yamanaka, T. Yoshida, H. Y. |
| author_facet | Redeker, J. Lin, C. Wah, Y. W. Ahn, J. K. Gonzalez, M. Hanai, K. Hsiung, Y. B. Kato, T. Kim, E. J. Komatsubara, T. K. Kotera, K. Lee, S. K. Lim, G. Y. Matsumura, T. Nanjo, H. Nomura, T. Nunes, T. Ono, K. Shiomi, K. Shiraishi, R. Tajima, Y. Tung, Y. C. Watanabe, H. Wu, T. Yamanaka, T. Yoshida, H. Y. |
| contents | We performed searches for $K_L\rightarrow π^0π^0X$ where $X$ may be an axion-like particle which promptly decays to two photons, and the first search for $K_L \rightarrow π^0π^0γγ$ at the KOTO experiment using data taken in 2021. The search is performed for $X$ mass in the range of 160$\unicode{x2013}$220 MeV/$c^2$. Three events were observed in the signal region, with two events near an $X$ mass of 177 MeV/$c^2$. This result led to a range of upper limits on the branching ratio, BR($K_L\rightarrow π^0π^0X$) $< (1\unicode{x2013}20) \times 10^{-7}$ at the 95% confidence level (C.L.). No events were observed for the analysis of $K_L \rightarrow π^0π^0γγ$, setting an upper limit on the branching ratio, BR($K_L \rightarrow π^0π^0γγ$) $< 1.69 \times 10^{-6}$ at the 95% C.L. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_20960 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The Search for $K_L \rightarrow π^0π^0γγ$ and $K_L\rightarrow π^0π^0X$ where $X\rightarrow 2γ$ at the KOTO Experiment Redeker, J. Lin, C. Wah, Y. W. Ahn, J. K. Gonzalez, M. Hanai, K. Hsiung, Y. B. Kato, T. Kim, E. J. Komatsubara, T. K. Kotera, K. Lee, S. K. Lim, G. Y. Matsumura, T. Nanjo, H. Nomura, T. Nunes, T. Ono, K. Shiomi, K. Shiraishi, R. Tajima, Y. Tung, Y. C. Watanabe, H. Wu, T. Yamanaka, T. Yoshida, H. Y. High Energy Physics - Experiment We performed searches for $K_L\rightarrow π^0π^0X$ where $X$ may be an axion-like particle which promptly decays to two photons, and the first search for $K_L \rightarrow π^0π^0γγ$ at the KOTO experiment using data taken in 2021. The search is performed for $X$ mass in the range of 160$\unicode{x2013}$220 MeV/$c^2$. Three events were observed in the signal region, with two events near an $X$ mass of 177 MeV/$c^2$. This result led to a range of upper limits on the branching ratio, BR($K_L\rightarrow π^0π^0X$) $< (1\unicode{x2013}20) \times 10^{-7}$ at the 95% confidence level (C.L.). No events were observed for the analysis of $K_L \rightarrow π^0π^0γγ$, setting an upper limit on the branching ratio, BR($K_L \rightarrow π^0π^0γγ$) $< 1.69 \times 10^{-6}$ at the 95% C.L. |
| title | The Search for $K_L \rightarrow π^0π^0γγ$ and $K_L\rightarrow π^0π^0X$ where $X\rightarrow 2γ$ at the KOTO Experiment |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2603.20960 |