Search for the decay K_L⁰ rightarrow 3γ

Y. C. Tung , Y. B. Hsiung , J. K. Ahn , Y. Akune , V. Baranov , K. F. Chen , J. Comfort , M. Doroshenko

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Y. Fujioka T. Inagaki S. Ishibashi N. Ishihara H. Ishii E. Iwai T. Iwata I. Kato S. Kobayashi S. Komatsu T. K. Komatsubara A. S. Kurilin E. Kuzmin A. Lednev H. S. Lee S. Y. Lee G. Y. Lim J. Ma T. Matsumura A. Moisseenko H. Morii T. Morimoto Y. Nakajima T. Nakano H. Nanjo N. Nishi J. Nix T. Nomura M. Nomachi R. Ogata H. Okuno K. Omata G. N. Perdue S. Perov S. Podolsky S. Porokhovoy K. Sakashita T. Sasaki N. Sasao H. Sato T. Sato M. Sekimoto T. Shimogawa T. Shinkawa Y. Stepanenko Y. Sugaya A. Sugiyama T. Sumida S. Suzuki Y. Tajima S. Takita Z. Tsamalaidze T. Tsukamoto Y. Wah H. Watanabe M. L. Wu M. Yamaga T. Yamanaka H. Y. Yoshida Y. Yoshimura Y. Zheng

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classification ✦ hep-ex

keywords gammarightarrowdecayeventproceedingresultssearchtimes10

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We performed a search for the decay $K_L^0 \rightarrow 3\gamma$ with the E391a detector at KEK. In the data accumulated in 2005, no event was observed in the signal region. Based on the assumption of $K_L^0 \rightarrow 3\gamma$ proceeding via parity-violation, we obtained the single event sensitivity to be $(3.23\pm0.14)\times10^{-8}$, and set an upper limit on the branching ratio to be $7.4\times10^{-8}$ at the 90% confidence level. This is a factor of 3.2 improvement compared to the previous results. The results of $K_L^0 \rightarrow 3\gamma$ proceeding via parity-conservation were also presented in this paper.

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Search for the decay K_L⁰ rightarrow 3γ

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