Study of the K0(L) --> pi0 pi0 nu nu-bar decay

E391a Collaboration: R. Ogata , S. Suzuki , J. K. Ahn , Y. Akune , V. Baranov , K. F. Chen , J. Comfort , M. Doroshenko

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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. Komatsubara A. 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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classification ✦ hep-ex

keywords limitbranchingdecayfractionnu-barconfidencedecaysdetector

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The rare decay K0(L) --> pi0 pi0 nu nu-bar was studied with the E391a detector at the KEK 12-GeV proton synchrotron. Based on 9.4 x 10^9 K0L decays, an upper limit of 8.1 x 10^{-7} was obtained for the branching fraction at 90% confidence level. We also set a limit on the K0(L) --> pi0 pi0 X (X --> invisible particles) process; the limit on the branching fraction varied from 7.0 x 10^{-7} to 4.0 x 10^{-5} for the mass of X ranging from 50 MeV/c^2 to 200 MeV/c^2.

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Study of the K0(L) --> pi0 pi0 nu nu-bar decay

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