Search for KL→π0νν¯ and KL→π0X0 Decays at the J-PARC KOTO Experiment
| Autor: | J. W. Ko, Y. J. Kim, M. Taylor, T. Mari, M. Tecchio, Yusuke T. Maeda, Toshio Masuda, Y. W. Wah, K. Kotera, N. McNeal, Y. C. Tung, Tetsushi Shimogawa, S. Su, Jessie Micallef, N. Kawasaki, J. K. Woo, K. Bryant, J. Beechert, C. Lin, Y. Sato, J. K. Ahn, T. K. Komatsubara, I. Kamiji, Y. B. Hsiung, S. H. Chen, M. Ohsugi, Motoya Sasaki, Manabu Togawa, Eunja Kim, S. Shinohara, G. Y. Lim, Hiroshi Yoshida, J. R. Comfort, T. Inagaki, H. Okuno, A. S. Kurilin, K. Dona, K. Miyazaki, Jongmin Lee, K. Shiomi, J. L. Kim, Toru Sato, Y. Luo, S. Suzuki, H. Schamis, M. Hutcheson, Koichi Sato, S. Seki, D. Naito, Y. Sugiyama, Noboru Sasao, H. Haraguchi, K. Nakagiri, T. Nomura, N. Hara, M. Campbell, D. Mcfarland, H. Nishimiya, T. Shinkawa, Q. S. Lin, T. Yamanaka, T. Matsumura, Hiroaki Watanabe, J. Ma, N. Shimizu, R. Murayama, Hajime Nanjo, Yasuhisa Tajima, B. Beckford |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Physical Review Letters. 122 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.122.021802 |
| Popis: | A search for the rare decay K_{L}→π^{0}νν[over ¯] was performed. With the data collected in 2015, corresponding to 2.2×10^{19} protons on target, a single event sensitivity of (1.30±0.01_{stat}±0.14_{syst})×10^{-9} was achieved and no candidate events were observed. We set an upper limit of 3.0×10^{-9} for the branching fraction of K_{L}→π^{0}νν[over ¯] at the 90% confidence level (C.L.), which improved the previous limit by almost an order of magnitude. An upper limit for K_{L}→π^{0}X^{0} was also set as 2.4×10^{-9} at the 90% C.L., where X^{0} is an invisible boson with a mass of 135 MeV/c^{2}. |
| Databáze: | OpenAIRE |
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