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Search for K-L -> pi(0)v(v)over-bar and K-L -> pi X-0(0) Decays at the J-PARC KOTO Experiment
- Authors
- Ahn, J. K.; Beckford, B.; Beechert, J.; Bryant, K.; Campbell, M.; Chen, S. H.; Comfort, J.; Dona, K.; Hara, N.; Haraguchi, H.; Hsiung, Y. B.; Hutcheson, M.; Inagaki, T.; Kamiji, I; Kawasaki, N.; Kim, E. J.; Kim, J. L.; Kim, Y. J.; Ko, J. W.; Komatsubara, T. K.; Kotera, K.; Kurilin, A. S.; Lee, J. W.; Lim, G. Y.; Lin, C.; Lin, Q.; Luo, Y.; Ma, J.; Maeda, Y.; Mari, T.; Masuda, T.; Matsumura, T.; Mcfarland, D.; McNeal, N.; Micallef, J.; Miyazaki, K.; Murayama, R.; Naito, D.; Nakagiri, K.; Nanjo, H.; Nishimiya, H.; Nomura, T.; Ohsugi, M.; Okuno, H.; Sasaki, M.; Sasao, N.; Sato, K.; Sato, T.; Sato, Y.; Schamis, H.; Seki, S.; Shimizu, N.; Shimogawa, T.; Shinkawa, T.; Shinohara, S.; Shiomi, K.; Su, S.; Sugiyama, Y.; Suzuki, S.; Tajima, Y.; Taylor, M.; Tecchio, M.; Togawa, M.; Tung, Y. C.; Wah, Y. W.; Watanabe, H.; Woo, J. K.; Yamanaka, T.; Yoshida, H. Y.
- Issue Date
- 15-1월-2019
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW LETTERS, v.122, no.2
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICAL REVIEW LETTERS
- Volume
- 122
- Number
- 2
- ISSN
- 0031-9007
- Abstract
- A search for the rare decay K-L -> pi(0)v (v) over bar was performed. With the data collected in 2015, corresponding to 2.2 x 10(19) protons on target, a single event sensitivity of (1.30 +/- 0.01(stat) +/- 0.14(syst)) x10(-9) was achieved and no candidate events were observed. We set an upper limit of 3.0 x 10(-9) for the branching fraction of K-L -> pi(0)v (v) over bar at the 90% confidence level (C.L.), which improved the previous limit by almost an order of magnitude. An upper limit for K-L -> pi X-0(0) was also set as 2.4 x 10(-9) at the 90% C.L., where X-0 is an invisible boson with a mass of 135 MeV/c(2).
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