학술논문
First Search for the $K_L \to \pi^0 \gamma$ Decay
Document Type
Working Paper
Author
Ahn, J. K.; Beckford, B.; Campbell, M.; Chen, S. H.; Choi, J. M.; Comfort, J.; Dona, K.; Farrington, M. S.; Hara, N.; Haraguchi, H.; Hsiung, Y. B.; Hutcheson, M.; Inagaki, T.; Isoe, M.; Kamiji, I.; Kim, E. J.; Kim, J. L.; Kim, H. M.; Komatsubara, T. K.; Kotera, K.; Lee, J. W.; Lim, G. Y.; Lin, C.; Lin, Q. S.; Luo, Y.; Mari, T.; Matsumura, T.; Mcfarland, D.; Miyazaki, K.; Murayama, R.; Nakagiri, K.; Nanjo, H.; Nishimiya, H.; Noichi, Y.; Nomura, T.; Nunes, T.; Ohsugi, M.; Okuno, H.; Redeker, J. C.; Sato, K.; Sato, T.; 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.
Source
Phys. Rev. D 102, 051103 (2020)
Subject
Language
Abstract
We report the first search for the $K_L \to \pi^0 \gamma$ decay, which is forbidden by Lorentz invariance, using the data from 2016 to 2018 at the J-PARC KOTO experiment. With a single event sensitivity of $(7.1\pm 0.3_{\rm stat.} \pm 1.6_{\rm syst.})\times 10^{-8}$, no candidate event was observed in the signal region. The upper limit on the branching fraction was set to be $1.7\times 10^{-7}$ at the 90\% confidence level.