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First Search for the K_L →π^0 γ Decay

J. K. Ahn,B. Beckford,M. Campbell,S. H. Chen,J. M. Choi,J. Comfort,K. Dona, M. S. Farrington,N. Hara,H. Haraguchi,Y. B. Hsiung,M. Hutcheson,T. Inagaki,M. Isoe,I. Kamiji,E. J. Kim, J. L. Kim,H. M. Kim,T. K. Komatsubara,K. Kotera,J. W. Lee,G. Y. Lim,C. Lin,Q. S. Lin,Y. Luo,T. Mari,T. Matsumura,D. Mcfarland,K. Miyazaki,R. Murayama,K. Nakagiri,H. Nanjo,H. Nishimiya,Y. Noichi,T. Nomura,T. Nunes,M. Ohsugi,H. Okuno,J. C. Redeker,K. Sato,T. Sato,Y. Sato,N. Shimizu,T. Shimogawa,T. Shinkawa,S. Shinohara,K. Shiomi,R. Shiraishi,S. Su,Y. Sugiyama,S. Suzuki,Y. Tajima,M. Taylor,M. Tecchio,M. Togawa,T. Toyoda,Y. C. Tung,Q. H. Vuong,Y. W. Wah,H. Watanabe,T. Yamanaka,H. Y. Yoshida

arxiv（2020）

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Abstract
We report the first search for the K_L →π^0 γ 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± 0.3_ stat.± 1.6_ syst.)× 10^-8, no candidate event was observed in the signal region. The upper limit on the branching fraction was set to be 1.7× 10^-7 at the 90% confidence level.
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