/ Experiment-HEP arXiv:1011.4403

Search for the decay $K_L^0 \rightarrow 3\gamma$

Tung, Y.C. (Taiwan, Natl. Taiwan U.) ; Hsiung, Y.B. (Taiwan, Natl. Taiwan U.) ; Ahn, J.K. (Pusan Natl. U.) ; Akune, Y. (Saga U., Japan) ; Baranov, V. (Dubna, JINR) ; Chen, K.F. (Taiwan, Natl. Taiwan U.) ; Comfort, J. (Arizona State U.) ; Doroshenko, M. (Sokendai, Tsukuba) ; Fujioka, Y. (Saga U., Japan) ; Inagaki, T. (KEK, Tsukuba) ; Ishibashi, S. (Saga U., Japan) ; Ishihara, N. (KEK, Tsukuba) ; Ishii, H. (Osaka U.) ; Iwai, E. (Osaka U.) ; Iwata, T. (Yamagata U.) ; Kato, I. (Yamagata U.) ; Kobayashi, S. (Saga U., Japan) ; Komatsu, S. (Osaka U.) ; Komatsubara, T.K. (KEK, Tsukuba) ; Kurilin, A.S. (Dubna, JINR) ; Kuzmin, E. (Dubna, JINR) ; Lednev, A. (Chicago U.) ; Lee, H.S. (Pusan Natl. U.) ; Lee, S.Y. (Pusan Natl. U.) ; Lim, G.Y. (KEK, Tsukuba) ; Ma, J. (Chicago U.) ; Matsumura, T. (Japan, Natl. Defence Academy) ; Moisseenko, A. (Dubna, JINR) ; Morii, H. (Kyoto U.) ; Morimoto, T. (KEK, Tsukuba) ; Nakajima, Y. (Kyoto U.) ; Nakano, T. (Osaka U.) ; Nanjo, H. (Kyoto U.) ; Nishi, N. (Osaka U.) ; Nix, J. (Chicago U.) ; Nomura, T. (Kyoto U.) ; Nomachi, M. (Osaka U.) ; Ogata, R. (Saga U., Japan) ; Okuno, H. (KEK, Tsukuba) ; Omata, K. (KEK, Tsukuba) ; Perdue, G.N. (Chicago U.) ; Perov, S. (Dubna, JINR) ; Podolsky, S. (Dubna, JINR) ; Porokhovoy, S. (Dubna, JINR) ; Sakashita, K. (Osaka U.) ; Sasaki, T. (Yamagata U.) ; Sasao, N. (Kyoto U.) ; Sato, H. (Yamagata U.) ; Sato, T. (KEK, Tsukuba) ; Sekimoto, M. (KEK, Tsukuba) ; Shimogawa, T. (Saga U., Japan) ; Shinkawa, T. (Japan, Natl. Defence Academy) ; Stepanenko, Y. (Dubna, JINR) ; Sugaya, Y. (Osaka U.) ; Sugiyama, A. (Saga U., Japan) ; Sumida, T. (Kyoto U.) ; Suzuki, S. (Saga U., Japan) ; Tajima, Y. (Yamagata U.) ; Takita, S. (Yamagata U.) ; Tsamalaidze, Z. (Dubna, JINR) ; Tsukamoto, T. (Saga U., Japan) ; Wah, Y. (Chicago U.) ; Watanabe, H. (Chicago U.) ; Wu, M.L. (Taiwan, Natl. Taiwan U.) ; Yamaga, M. (KEK, Tsukuba) ; Yamanaka, T. (Osaka U.) ; Yoshida, H.Y. (Yamagata U.) ; Yoshimura, Y. (KEK, Tsukuba) ; Zheng, Y. (Chicago U.)

Published in: Phys.Rev.
Year: 2011
Vol.: D83
Page No: 031101

Abstract: 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.

Web-Page: http://inspirebeta.net/record/878225/files/ebx.png; http://inspirebeta.net/record/878225/files/fig1_e391_overview_2d.png; http://inspirebeta.net/record/878225/files/final.png; http://inspirebeta.net/record/878225/files/k2pi0.png; http://inspirebeta.net/record/878225/files/k3pi0.png; http://inspirebeta.net/record/878225/files/m13.png; http://inspirebeta.net/record/878225/files/nnout.png; http://inspirebeta.net/record/878225/files/rbx.png

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