Search for Dark Particles in $K^0_L \to γX$ at the KOTO Experiment

Fuente: arXiv

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Bibliographic Details
Main Authors:	Wu, T., Tung, Y. C., Hsiung, Y. B., Ahn, J. K., Gonzalez, M., Kim, E. J., Komatsubara, T. K., Kotera, K., Lee, S. K., Lim, G. Y., Lin, C., Matsumura, T., Nanjo, H., Noichi, Y., Nomura, T., Nunes, T., Ono, K., Redeker, J., Shimizu, N., Shinohara, S., Shiomi, K., Shiraishi, R., Tajima, Y., Wah, Y. W., Watanabe, H., Yamanaka, T., Yoshida., H. Y.
Format:	Preprint
Published:	2025
Subjects:	High Energy Physics - Experiment
Online Access:	Acceder al recurso
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_version_	1866913127987150848
author	Wu, T. Tung, Y. C. Hsiung, Y. B. Ahn, J. K. Gonzalez, M. Kim, E. J. Komatsubara, T. K. Kotera, K. Lee, S. K. Lim, G. Y. Lin, C. Matsumura, T. Nanjo, H. Noichi, Y. Nomura, T. Nunes, T. Ono, K. Redeker, J. Shimizu, N. Shinohara, S. Shiomi, K. Shiraishi, R. Tajima, Y. Wah, Y. W. Watanabe, H. Yamanaka, T. Yoshida., H. Y.
author_facet	Wu, T. Tung, Y. C. Hsiung, Y. B. Ahn, J. K. Gonzalez, M. Kim, E. J. Komatsubara, T. K. Kotera, K. Lee, S. K. Lim, G. Y. Lin, C. Matsumura, T. Nanjo, H. Noichi, Y. Nomura, T. Nunes, T. Ono, K. Redeker, J. Shimizu, N. Shinohara, S. Shiomi, K. Shiraishi, R. Tajima, Y. Wah, Y. W. Watanabe, H. Yamanaka, T. Yoshida., H. Y.
contents	We report a search for an invisible particle $X$ in the decay $K^0_L\rightarrow γX$ ($X \to \text{invisible}$), where $X$ can be interpreted as a massless or massive dark photon. No evidence for $X$ was found, based on 13 candidate events consistent with a predicted background of $12.66 \pm 4.42_{\text{stat.}} \pm 2.13_{\text{syst.}}$ events. Upper limits on the branching ratio of $K^0_L\rightarrow γX$ were set for the $X$ mass range $0 \leq m_X \leq 425$ MeV/$c^2$. For massless $X$, the upper limit was $3.4\times10^{-7}$ at the $90\%$ confidence level, while for massive $X$, the upper limits in the searched mass region ranged from $O(10^{-7})$ to $O(10^{-3})$.
format	Preprint
id	arxiv_https___arxiv_org_abs_2511_08110
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Search for Dark Particles in $K^0_L \to γX$ at the KOTO Experiment Wu, T. Tung, Y. C. Hsiung, Y. B. Ahn, J. K. Gonzalez, M. Kim, E. J. Komatsubara, T. K. Kotera, K. Lee, S. K. Lim, G. Y. Lin, C. Matsumura, T. Nanjo, H. Noichi, Y. Nomura, T. Nunes, T. Ono, K. Redeker, J. Shimizu, N. Shinohara, S. Shiomi, K. Shiraishi, R. Tajima, Y. Wah, Y. W. Watanabe, H. Yamanaka, T. Yoshida., H. Y. High Energy Physics - Experiment We report a search for an invisible particle $X$ in the decay $K^0_L\rightarrow γX$ ($X \to \text{invisible}$), where $X$ can be interpreted as a massless or massive dark photon. No evidence for $X$ was found, based on 13 candidate events consistent with a predicted background of $12.66 \pm 4.42_{\text{stat.}} \pm 2.13_{\text{syst.}}$ events. Upper limits on the branching ratio of $K^0_L\rightarrow γX$ were set for the $X$ mass range $0 \leq m_X \leq 425$ MeV/$c^2$. For massless $X$, the upper limit was $3.4\times10^{-7}$ at the $90\%$ confidence level, while for massive $X$, the upper limits in the searched mass region ranged from $O(10^{-7})$ to $O(10^{-3})$.
title	Search for Dark Particles in $K^0_L \to γX$ at the KOTO Experiment
topic	High Energy Physics - Experiment
url	https://arxiv.org/abs/2511.08110