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arXiv · 2308.02722

Study on the accidental background of the JSNS$^2$ experiment

D. H. Lee·S. Ajimura·M. K. Cheoun·J. H. Choi·J. Y. Choi·T. Dodo·J. Goh·K. Haga·M. Harada·S. Hasegawa·T. Hiraiwa·W. Hwang·H. I. Jang·J. S. Jang·H. Jeon·S. Jeon·K. K. Joo·D. E. Jung·S. K. Kang·Y. Kasugai·T. Kawasaki·E. J. Kim·J. Y. Kim·S. B. Kim·W. Kim·H. Kinoshita·T. Konno·I. T. Lim·C. Little·E. Marzec·T. Maruyama·S. Masuda·S. Meigom·S. Monjushiro·D. H. Moon·T. Nakano·M. Niiyama·K. Nishikawa·M. Y. Pac·H. W. Park·J. S. Park·R. G. Park·S. J. M. Peeters·C. Rott·K. Sakai·S. Sakamoto·T. Shima·C. D. Shin·J. Spitz·F. Suekane·Y. Sugaya·K. Suzuya·M. Taira·Y. Yamaguchi·M. Yeh·I. S. Yeo·C. Yoo·I. Yu
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Abstract

JSNS$^2$ (J-PARC Sterile Neutrino Search at J-PARC Spallation Neutron Source) is an experiment which searches for sterile neutrinos via the observation of $\bar{\nu}_{\mu} \to \bar{\nu}_{e}$ appearance oscillations using muon decay-at-rest neutrinos. The data taking of JSNS$^2$ have been performed from 2021. In this manuscript, a study of the accidental background is presented. The rate of the accidental background is (9.29$\pm 0.39) \times 10^{-8}$ / spill with 0.75 MW beam power and comparable to the number of searching signals.

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D. H. Lee, S. Ajimura, M. K. Cheoun, J. H. Choi, J. Y. Choi, T. Dodo, J. Goh, K. Haga, M. Harada, S. Hasegawa, T. Hiraiwa, W. Hwang, H. I. Jang, J. S. Jang, H. Jeon, S. Jeon, K. K. Joo, D. E. Jung, S. K. Kang, Y. Kasugai, T. Kawasaki, E. J. Kim, J. Y. Kim, S. B. Kim, W. Kim, H. Kinoshita, T. Konno, I. T. Lim, C. Little, E. Marzec, T. Maruyama, S. Masuda, S. Meigom, S. Monjushiro, D. H. Moon, T. Nakano, M. Niiyama, K. Nishikawa, M. Y. Pac, H. W. Park, J. S. Park, R. G. Park, S. J. M. Peeters, C. Rott, K. Sakai, S. Sakamoto, T. Shima, C. D. Shin, J. Spitz, F. Suekane, Y. Sugaya, K. Suzuya, M. Taira, Y. Yamaguchi, M. Yeh, I. S. Yeo, C. Yoo, I. Yu. 2023-08-04. Study on the accidental background of the JSNS$^2$ experiment. https://doi.org/10.1140/epjc/s10052-024-12778-7

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