Study of the KL0→π0π0νν̄ decay

R. Ogata, S. Suzuki, Jung Keun 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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Abstract

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
Volume84
Issue number5
DOIs
Publication statusPublished - 2011 Sep 21
Externally publishedYes

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Ogata, R., Suzuki, S., Ahn, J. K., Akune, Y., Baranov, V., Chen, K. F., Comfort, J., Doroshenko, M., Fujioka, Y., Hsiung, Y. B., Inagaki, T., Ishibashi, S., Ishihara, N., Ishii, H., Iwai, E., Iwata, T., Kato, I., Kobayashi, S., Komatsu, S., ... Zheng, Y. (2011). Study of the KL0→π0π0νν̄ decay. Physical Review D - Particles, Fields, Gravitation and Cosmology, 84(5), [052009]. https://doi.org/10.1103/PhysRevD.84.052009