Search for the decay KL0→3γ

Y. C. Tung, Y. B. Hsiung, J. K. 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

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


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
Issue number3
Publication statusPublished - 2011 Feb 2
Externally publishedYes

Bibliographical note

Funding Information:
A. P. Hatzes and W. D. Cochran acknowledge the support of NASA grants NAG5-4384 and NAG5-9227 and NSF grant AST 98-08980. B. McArthur receives support through NASA grant NAS5-1603. M. Endl acknowledges support by the Austrian Fond zur Förderung der wissenschaftlichen Forschung Nr. S7302. S. L. Baliunas is grateful to the dedication of M. A. Bradford, R. A. Donahue, K. Palmer, and W. H. Soon to the HK Project at Mount Wilson Observatory, which is operated by the Mount Wilson Institute under an agreement with the Carnegie Institution of Washington. Support for this research has been made possible through the generosity of the Richard C. Lounsbery Foundation. R. P. Butler and G. W. Marcy thank D. Fischer, E. Williams, S. Vogt, and C. McCarthy. Finally, we thank K. Dennerl and S. Döbereiner for help with the ESO observations.

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)


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