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Study of the K-L -> pi(0)nu(nu)over-bar Decay at the J-PARC KOTO Experiment
- Authors
- Ahn, J. K.; Beckford, B.; Campbell, M.; Chen, S. H.; Comfort, J.; Dona, K.; Farrington, M. S.; Hanai, K.; Hara, N.; Haraguchi, H.; Hsiung, Y. B.; Hutcheson, M.; Inagaki, T.; Isoe, M.; Kamiji, I; Kato, T.; Kim, E. J.; Kim, J. L.; Kim, H. M.; Komatsubara, T. K.; Kotera, K.; Lee, S. K.; Lee, J. W.; Lim, G. Y.; Lin, Q. S.; Lin, C.; Luo, Y.; Mari, T.; Masuda, T.; Matsumura, T.; Mcfarland, D.; McNeal, N.; Miyazaki, K.; Murayama, R.; Nakagiri, K.; Nanjo, H.; Nishimiya, H.; Noichi, Y.; Nomura, T.; Nunes, T.; Ohsugi, M.; Okuno, H.; Redeker, J. C.; Sanchez, J.; Sasaki, M.; Sasao, N.; Sato, T.; Sato, K.; Sato, Y.; Shimizu, N.; Shimogawa, T.; Shinkawa, T.; Shinohara, S.; Shiomi, K.; Shiraishi, R.; Su, S.; Sugiyama, Y.; Suzuki, S.; Tajima, Y.; Taylor, M.; Tecchio, M.; Togawa, M.; Toyoda, T.; Tung, Y-C; Vuong, Q. H.; Wah, Y. W.; Watanabe, H.; Yamanaka, T.; Yoshida, H. Y.; Zaidenberg, L.
- Issue Date
- 24-3월-2021
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW LETTERS, v.126, no.12
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICAL REVIEW LETTERS
- Volume
- 126
- Number
- 12
- ISSN
- 0031-9007
- Abstract
- The rare decay K-L -> pi(0)nu(nu) over bar was studied with the dataset taken at the J-PARC KOTO experiment in 2016, 2017, and 2018. With a single event sensitivity of (7.20 +/- 0.05(stat) +/- 0.66(syst)) x 10(-)(10), three candidate events were observed in the signal region. After unveiling them, contaminations from K-+/- and scattered K-L decays were studied, and the total number of background events was estimated to be 1.22 +/- 0.26. We conclude that the number of observed events is statistically consistent with the background expectation. For this dataset, we set an upper limit of 4.9 x 10(-9) on the branching fraction of K-L -> pi(0)nu(nu) over bar at the 90% confidence level.
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