Study of the KL0→π0π0νν̄ decay

R. Ogata, S. Suzuki, J. K. Ahn, Y. Akune, V. Baranov, K. F. Chen, J. Comfort, M. Doroshenko, Y. Fujioka, Y. B. Hsiung, T. Inagaki, S. Ishibashi, N. Ishihara, H. Ishii, E. Iwai, T. Iwata, I. Kato, S. Kobayashi, S. Komatsu, T. K. KomatsubaraA. 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, 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, Y. Tajima, S. Takita, Z. Tsamalaidze, T. Tsukamoto, Y. C. Tung, Y. W. Wah, H. Watanabe, M. L. Wu, M. Yamaga, T. Yamanaka, H. Y. Yoshida, Y. Yoshimura, Y. Zheng

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17 Citations (Scopus)


The rare decay KL0→π0π0νν̄ was studied with the E391a detector at the KEK 12-GeV proton synchrotron. Based on 9.4×109 KL0 decays, an upper limit of 8.1×10-7 was obtained for the branching fraction at 90% confidence level. We also set a limit on the KL0→π0π0X (X→invisible particles) process; the limit on the branching fraction varied from 7.0×10-7 to 4.0×10 -5 for the mass of X ranging from 50MeV/c2 to 200MeV/c2.

Original languageEnglish
Article number052009
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number5
Publication statusPublished - 2011 Sept 21
Externally publishedYes

ASJC Scopus subject areas

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


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