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First results from the search for an excess of $\barν_{e}$ events in JSNS$^2$

Fuente: arXiv

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Auteurs principaux:	Lee, D. H., Ajimura, S., Antonakis, A., Botran, M., Cheoun, M. K., Choi, J. H., Choi, J. W., Choi, J. Y., Dodo, T., Furuta, H., Goh, J. H., Harada, M., Hasegawa, S., Hino, Y., Hiraiwa, T., Hwang, W. S., Iida, T., Iwai, E., Iwata, S., Jang, H. I., Jang, J. S., Jang, M. C., Jeon, H. K., Jeon, S. H., Joo, K. K., Jung, D. E., Kang, S. K., Kasugai, Y., Kawasaki, T., Kim, E. M., Kim, E. J., Kim, J. Y., Kim, S. Y., Kim, S. B., Kim, W., Kinoshita, H., Konno, T., Kuwata, K., Lee, S., Lim, I. T., Little, C., Maruyama, T., Marzec, E., Masuda, S., Monjushiro, S. Meigo S., Moon, D. H., Nakano, T., Niiyama, M., Nishikawa, K., Noumachi, M., Pac, M. Y., Park, B. J., Park, H. W., Park, J. B., Park, Jisu, Park, J. S., Park, R. G., Peeters, S. J. M., Roellinghoff, G., Rott, C., Ryu, J. W., Sakai, K., Sakamoto, S., Shima, T., Shin, C. D., Spitz, J., Stancu, I., Suekane, F., Sugaya, Y., Suzuya, K., Taira, M., Takeuchi, Y., Wang, W., Waterfield, J., Wei, W., White, R., Yamaguchi, Y., Yeh, M., Yeo, I. S., Yoo, C., Yu, I., Zohaib, A.
Format:	Preprint
Publié:	2026
Sujets:	High Energy Physics - Experiment
Accès en ligne:	Acceder al recurso
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author	Lee, D. H. Ajimura, S. Antonakis, A. Botran, M. Cheoun, M. K. Choi, J. H. Choi, J. W. Choi, J. Y. Dodo, T. Furuta, H. Goh, J. H. Harada, M. Hasegawa, S. Hino, Y. Hiraiwa, T. Hwang, W. S. Iida, T. Iwai, E. Iwata, S. Jang, H. I. Jang, J. S. Jang, M. C. Jeon, H. K. Jeon, S. H. Joo, K. K. Jung, D. E. Kang, S. K. Kasugai, Y. Kawasaki, T. Kim, E. M. Kim, E. J. Kim, J. Y. Kim, S. Y. Kim, S. B. Kim, W. Kinoshita, H. Konno, T. Kuwata, K. Lee, S. Lim, I. T. Little, C. Maruyama, T. Marzec, E. Masuda, S. Monjushiro, S. Meigo S. Moon, D. H. Nakano, T. Niiyama, M. Nishikawa, K. Noumachi, M. Pac, M. Y. Park, B. J. Park, H. W. Park, J. B. Park, Jisu Park, J. S. Park, R. G. Peeters, S. J. M. Roellinghoff, G. Rott, C. Ryu, J. W. Sakai, K. Sakamoto, S. Shima, T. Shin, C. D. Spitz, J. Stancu, I. Suekane, F. Sugaya, Y. Suzuya, K. Taira, M. Takeuchi, Y. Wang, W. Waterfield, J. Wei, W. White, R. Yamaguchi, Y. Yeh, M. Yeo, I. S. Yoo, C. Yu, I. Zohaib, A.
author_facet	Lee, D. H. Ajimura, S. Antonakis, A. Botran, M. Cheoun, M. K. Choi, J. H. Choi, J. W. Choi, J. Y. Dodo, T. Furuta, H. Goh, J. H. Harada, M. Hasegawa, S. Hino, Y. Hiraiwa, T. Hwang, W. S. Iida, T. Iwai, E. Iwata, S. Jang, H. I. Jang, J. S. Jang, M. C. Jeon, H. K. Jeon, S. H. Joo, K. K. Jung, D. E. Kang, S. K. Kasugai, Y. Kawasaki, T. Kim, E. M. Kim, E. J. Kim, J. Y. Kim, S. Y. Kim, S. B. Kim, W. Kinoshita, H. Konno, T. Kuwata, K. Lee, S. Lim, I. T. Little, C. Maruyama, T. Marzec, E. Masuda, S. Monjushiro, S. Meigo S. Moon, D. H. Nakano, T. Niiyama, M. Nishikawa, K. Noumachi, M. Pac, M. Y. Park, B. J. Park, H. W. Park, J. B. Park, Jisu Park, J. S. Park, R. G. Peeters, S. J. M. Roellinghoff, G. Rott, C. Ryu, J. W. Sakai, K. Sakamoto, S. Shima, T. Shin, C. D. Spitz, J. Stancu, I. Suekane, F. Sugaya, Y. Suzuya, K. Taira, M. Takeuchi, Y. Wang, W. Waterfield, J. Wei, W. White, R. Yamaguchi, Y. Yeh, M. Yeo, I. S. Yoo, C. Yu, I. Zohaib, A.
contents	The JSNS$^2$ (J-PARC Sterile Neutrino Search at the J-PARC Spallation Neutron Source) experiment at the Material and Life Science Facility (MLF) of J-PARC is designed to directly test an excess on $\barν_{e}$ events which was indicated by LSND (Liquid Scintillator Neutrino Detector). The combination of a short-pulsed proton beam and a gadolinium-loaded liquid scintillator provides an excellent signal-to-noise ratio. In this article, we report the first results of a direct test based on data collected in 2022. After applying all event selection criteria, two events are observed, consistent with the expected background of 2.3$\pm$0.4 events. No excess of $\barν_e$ events are seen in this report, however the expected number of events due to LSND anomaly is 1.1$\pm$0.5, thus this result is not yet conclusive. Data taking has been ongoing since 2021 and will continue in future runs. In addition, a new far detector has recently been constructed for the second phase experiment, JSNS$^2$-II, marking an important milestone toward forthcoming measurements.
format	Preprint
id	arxiv_https___arxiv_org_abs_2602_06274
institution	arXiv
publishDate	2026
record_format	arxiv
spellingShingle	First results from the search for an excess of $\barν_{e}$ events in JSNS$^2$ Lee, D. H. Ajimura, S. Antonakis, A. Botran, M. Cheoun, M. K. Choi, J. H. Choi, J. W. Choi, J. Y. Dodo, T. Furuta, H. Goh, J. H. Harada, M. Hasegawa, S. Hino, Y. Hiraiwa, T. Hwang, W. S. Iida, T. Iwai, E. Iwata, S. Jang, H. I. Jang, J. S. Jang, M. C. Jeon, H. K. Jeon, S. H. Joo, K. K. Jung, D. E. Kang, S. K. Kasugai, Y. Kawasaki, T. Kim, E. M. Kim, E. J. Kim, J. Y. Kim, S. Y. Kim, S. B. Kim, W. Kinoshita, H. Konno, T. Kuwata, K. Lee, S. Lim, I. T. Little, C. Maruyama, T. Marzec, E. Masuda, S. Monjushiro, S. Meigo S. Moon, D. H. Nakano, T. Niiyama, M. Nishikawa, K. Noumachi, M. Pac, M. Y. Park, B. J. Park, H. W. Park, J. B. Park, Jisu Park, J. S. Park, R. G. Peeters, S. J. M. Roellinghoff, G. Rott, C. Ryu, J. W. Sakai, K. Sakamoto, S. Shima, T. Shin, C. D. Spitz, J. Stancu, I. Suekane, F. Sugaya, Y. Suzuya, K. Taira, M. Takeuchi, Y. Wang, W. Waterfield, J. Wei, W. White, R. Yamaguchi, Y. Yeh, M. Yeo, I. S. Yoo, C. Yu, I. Zohaib, A. High Energy Physics - Experiment The JSNS$^2$ (J-PARC Sterile Neutrino Search at the J-PARC Spallation Neutron Source) experiment at the Material and Life Science Facility (MLF) of J-PARC is designed to directly test an excess on $\barν_{e}$ events which was indicated by LSND (Liquid Scintillator Neutrino Detector). The combination of a short-pulsed proton beam and a gadolinium-loaded liquid scintillator provides an excellent signal-to-noise ratio. In this article, we report the first results of a direct test based on data collected in 2022. After applying all event selection criteria, two events are observed, consistent with the expected background of 2.3$\pm$0.4 events. No excess of $\barν_e$ events are seen in this report, however the expected number of events due to LSND anomaly is 1.1$\pm$0.5, thus this result is not yet conclusive. Data taking has been ongoing since 2021 and will continue in future runs. In addition, a new far detector has recently been constructed for the second phase experiment, JSNS$^2$-II, marking an important milestone toward forthcoming measurements.
title	First results from the search for an excess of $\barν_{e}$ events in JSNS$^2$
topic	High Energy Physics - Experiment
url	https://arxiv.org/abs/2602.06274