Search for K_{L}→π^{0}νν[over ¯] and K_{L}→π^{0}X^{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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