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First Search for the K_L to π⁰ γ Decay

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arxiv 2006.14918 v2 pith:MY4ICI7A submitted 2020-06-26 hep-ex

First Search for the K_L to π⁰ γ Decay

J. K. Ahn , B. Beckford , M. Campbell , S. H. Chen , J. M. Choi , J. Comfort , K. Dona , M. S. Farrington
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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
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classification hep-ex
keywords decayeventfirstgammasearchtimesbranchingcandidate
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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.

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