Details

Autor(en) / Beteiligte

• 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

Titel

Study of the K_{L}→π^{0}νν[over ¯] Decay at the J-PARC KOTO Experiment

Ist Teil von

• Physical review letters, 2021-03, Vol.126 (12), p.121801-121801

Ort / Verlag

United States

Erscheinungsjahr

2021

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• 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.