Search For K-L -> Pi(0)V(V)Over-Bar And K-L -> Pi X-0(0) Decays At The J-Parc Koto Experiment

J. K. Ahn, B. Beckford, J. Beechert, K. Bryant, M. Campbell, S. H. Chen,J. Comfort, K. Dona, N. Hara, H. Haraguchi,Y. B. Hsiung, M. Hutcheson,T. Inagaki, I Kamiji, N. Kawasaki,E. J. Kim,J. L. Kim,Y. J. Kim, J. W. Ko, T. K. Komatsubara, K. Kotera, A. S. Kurilin,J. W. Lee,G. Y. Lim,C. Lin, Q. Lin,Y. Luo,J. Ma, Y. Maeda, T. Mari, T. Masuda, T. Matsumura, D. Mcfarland, N. Mcneal, J. Micallef, K. Miyazaki, R. Murayama, D. Naito, K. Nakagiri, H. Nanjo, H. Nishimiya, T. Nomura, M. Ohsugi, H. Okuno, M. Sasaki, N. Sasao, K. Sato, T. Sato, Y. Sato,H. Schamis, S. Seki, N. Shimizu, T. Shimogawa, T. Shinkawa, S. Shinohara, K. Shiomi,S. Su, Y. Sugiyama, S. Suzuki, Y. Tajima, M. Taylor, M. Tecchio, M. Togawa,Y. C. Tung, Y. W. Wah, H. Watanabe, J. K. Woo, T. Yamanaka, H. Y. Yoshida

PHYSICAL REVIEW LETTERS（2019）

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摘要

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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