Search for the $K_{L} \to π^{0} ν\barν$ Decay at the J-PARC KOTO Experiment

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Main Authors:	KOTO Collaboration, Ahn, J. K., Farriagton, M., Gonzalez, M., Grethen, N., Hanai, K., Hara, N., Haraguchi, H., Hsiung, Y. B., Inagaki, T., Katayama, M., Kato, T., Kawata, Y., Kim, E. J., Kim, H. M., Kitagawa, A., Komatsubara, T. K., Kotera, K., Lee, S. K., Li, X., Lim, G. Y., Lin, C., Luo, Y., Mari, T., Matsumura, T., Morioka, I., Nanjo, H., Nishimiya, H., Noichi, Y., Nomura, T., Ono, K., Osugi, M., Paschos, P., Redeker, J., Sato, T., Sato, Y., Shibata, T., Shimizu, N., Shinkawa, T., Shiomi, K., Shiraishi, R., Suzuki, S., Tajima, Y., Taylor, N., Tung, Y. C., Wah, Y. W., Watanabe, H., Wu, T., Yamanaka, T., Yoshida, H. Y.
Format:	Preprint
Published:	2024
Subjects:	High Energy Physics - Experiment
Online Access:	Acceder al recurso
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author	KOTO Collaboration Ahn, J. K. Farriagton, M. Gonzalez, M. Grethen, N. Hanai, K. Hara, N. Haraguchi, H. Hsiung, Y. B. Inagaki, T. Katayama, M. Kato, T. Kawata, Y. Kim, E. J. Kim, H. M. Kitagawa, A. Komatsubara, T. K. Kotera, K. Lee, S. K. Li, X. Lim, G. Y. Lin, C. Luo, Y. Mari, T. Matsumura, T. Morioka, I. Nanjo, H. Nishimiya, H. Noichi, Y. Nomura, T. Ono, K. Osugi, M. Paschos, P. Redeker, J. Sato, T. Sato, Y. Shibata, T. Shimizu, N. Shinkawa, T. Shiomi, K. Shiraishi, R. Suzuki, S. Tajima, Y. Taylor, N. Tung, Y. C. Wah, Y. W. Watanabe, H. Wu, T. Yamanaka, T. Yoshida, H. Y.
author_facet	KOTO Collaboration Ahn, J. K. Farriagton, M. Gonzalez, M. Grethen, N. Hanai, K. Hara, N. Haraguchi, H. Hsiung, Y. B. Inagaki, T. Katayama, M. Kato, T. Kawata, Y. Kim, E. J. Kim, H. M. Kitagawa, A. Komatsubara, T. K. Kotera, K. Lee, S. K. Li, X. Lim, G. Y. Lin, C. Luo, Y. Mari, T. Matsumura, T. Morioka, I. Nanjo, H. Nishimiya, H. Noichi, Y. Nomura, T. Ono, K. Osugi, M. Paschos, P. Redeker, J. Sato, T. Sato, Y. Shibata, T. Shimizu, N. Shinkawa, T. Shiomi, K. Shiraishi, R. Suzuki, S. Tajima, Y. Taylor, N. Tung, Y. C. Wah, Y. W. Watanabe, H. Wu, T. Yamanaka, T. Yoshida, H. Y.
contents	We performed a search for the $K_L \to π^{0} ν\barν$ decay using the data taken in 2021 at the J-PARC KOTO experiment. With newly installed counters and new analysis method, the expected background was suppressed to $0.252\pm0.055_{\mathrm{stat}}$$^{+0.052}_{-0.067}$$_{\mathrm{syst}}$. With a single event sensitivity of $(9.33 \pm 0.06_{\rm stat} \pm 0.84_{\rm syst})\times 10^{-10}$, no events were observed in the signal region. An upper limit on the branching fraction for the decay was set to be $2.2\times10^{-9}$ at the 90% confidence level (C.L.), which improved the previous upper limit from KOTO by a factor of 1.4. With the same data, a search for $K_L \to π^{0} X^{0}$ was also performed, where $X^{0}$ is an invisible boson with a mass ranging from 1 MeV/$c^{2}$ to 260 MeV/$c^{2}$. For $X^{0}$ with a mass of 135 MeV/$c^{2}$, an upper limit on the branching fraction of $K_L \to π^{0} X^{0}$ was set to be $1.6\times10^{-9}$ at the 90% C.L.
format	Preprint
id	arxiv_https___arxiv_org_abs_2411_11237
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	Search for the $K_{L} \to π^{0} ν\barν$ Decay at the J-PARC KOTO Experiment KOTO Collaboration Ahn, J. K. Farriagton, M. Gonzalez, M. Grethen, N. Hanai, K. Hara, N. Haraguchi, H. Hsiung, Y. B. Inagaki, T. Katayama, M. Kato, T. Kawata, Y. Kim, E. J. Kim, H. M. Kitagawa, A. Komatsubara, T. K. Kotera, K. Lee, S. K. Li, X. Lim, G. Y. Lin, C. Luo, Y. Mari, T. Matsumura, T. Morioka, I. Nanjo, H. Nishimiya, H. Noichi, Y. Nomura, T. Ono, K. Osugi, M. Paschos, P. Redeker, J. Sato, T. Sato, Y. Shibata, T. Shimizu, N. Shinkawa, T. Shiomi, K. Shiraishi, R. Suzuki, S. Tajima, Y. Taylor, N. Tung, Y. C. Wah, Y. W. Watanabe, H. Wu, T. Yamanaka, T. Yoshida, H. Y. High Energy Physics - Experiment We performed a search for the $K_L \to π^{0} ν\barν$ decay using the data taken in 2021 at the J-PARC KOTO experiment. With newly installed counters and new analysis method, the expected background was suppressed to $0.252\pm0.055_{\mathrm{stat}}$$^{+0.052}_{-0.067}$$_{\mathrm{syst}}$. With a single event sensitivity of $(9.33 \pm 0.06_{\rm stat} \pm 0.84_{\rm syst})\times 10^{-10}$, no events were observed in the signal region. An upper limit on the branching fraction for the decay was set to be $2.2\times10^{-9}$ at the 90% confidence level (C.L.), which improved the previous upper limit from KOTO by a factor of 1.4. With the same data, a search for $K_L \to π^{0} X^{0}$ was also performed, where $X^{0}$ is an invisible boson with a mass ranging from 1 MeV/$c^{2}$ to 260 MeV/$c^{2}$. For $X^{0}$ with a mass of 135 MeV/$c^{2}$, an upper limit on the branching fraction of $K_L \to π^{0} X^{0}$ was set to be $1.6\times10^{-9}$ at the 90% C.L.
title	Search for the $K_{L} \to π^{0} ν\barν$ Decay at the J-PARC KOTO Experiment
topic	High Energy Physics - Experiment
url	https://arxiv.org/abs/2411.11237