Study of the K_{L}→π^{0}νν[over ¯] Decay at the J-PARC KOTO Experiment.
In: Physical review letters, Jg. 126 (2021-03-26), Heft 12, S. 121801
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Zugriff:
The rare decay K_{L}→π^{0}νν[over ¯] 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})×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 4.9×10^{-9} on the branching fraction of K_{L}→π^{0}νν[over ¯] at the 90% confidence level.
Titel: |
Study of the K_{L}→π^{0}νν[over ¯] Decay at the J-PARC KOTO Experiment.
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Autor/in / Beteiligte Person: | Ahn, JK ; Beckford, B ; Campbell, M ; Chen, SH ; Comfort, J ; Dona, K ; Farrington, MS ; Hanai, K ; Hara, N ; Haraguchi, H ; Hsiung, YB ; Hutcheson, M ; Inagaki, T ; Isoe, M ; Kamiji, I ; Kato, T ; Kim, EJ ; Kim, JL ; Kim, HM ; Komatsubara, TK ; Kotera, K ; Lee, SK ; Lee, JW ; Lim, GY ; Lin, QS ; 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, JC ; 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, YC ; Vuong, QH ; Wah, YW ; Watanabe, H ; Yamanaka, T ; Yoshida, HY ; Zaidenberg, L |
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Zeitschrift: | Physical review letters, Jg. 126 (2021-03-26), Heft 12, S. 121801 |
Veröffentlichung: | New York : American Physical Society, 2021 |
Medientyp: | academicJournal |
ISSN: | 1079-7114 (electronic) |
DOI: | 10.1103/PhysRevLett.126.121801 |
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