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. Meigo, 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

The European Physical Journal C（2024）

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摘要

JSNS ^2 (J-PARC Sterile Neutrino Search at J-PARC Spallation Neutron Source) is an experiment that searches for sterile neutrinos via the observation of ν̅_μ→ν̅_e appearance oscillations using muon decay-at-rest neutrinos. The JSNS ^2 experiment performed data taking from 2021. In this manuscript, a study of the accidental background is presented. The rate of the accidental background is ( 9.29± 0.39) × 10^-8 /spill with 0.75 MW beam power and comparable to the expected number of signal events.

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