Search for the decay KL0→3γ

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

We performed a search for the decay KL0→3γ 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 KL0→3γ proceeding via parity-violation, we obtained the single event sensitivity to be (3.23±0.14)×10-8, and set an upper limit on the branching ratio to be 7.4×10-8 at the 90% confidence level. This is a factor of 3.2 improvement compared to the previous results. The results of KL0→3γ proceeding via parity-conservation were also presented in this paper.

Original languageEnglish
Article number031101
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume83
Issue number3
DOIs
Publication statusPublished - 2011 Feb 2
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Tung, Y. C., Hsiung, Y. B., Ahn, J. K., Akune, Y., Baranov, V., Chen, K. F., Comfort, J., Doroshenko, M., Fujioka, Y., Inagaki, T., Ishibashi, S., Ishihara, N., Ishii, H., Iwai, E., Iwata, T., Kato, I., Kobayashi, S., Komatsu, S., Komatsubara, T. K., ... Zheng, Y. (2011). Search for the decay KL0→3γ. Physical Review D - Particles, Fields, Gravitation and Cosmology, 83(3), [031101]. https://doi.org/10.1103/PhysRevD.83.031101