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

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arxiv 1106.3404 v2 pith:JV6LHCFI submitted 2011-06-17 hep-ex

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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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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  1. Probing CP and flavor violation in neutral kaon decays with ALPs

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    The ratio of K_L to pi pi a versus K_L to pi0 a decay rates probes CP violation via flavor violation alone, with weak-interaction contributions emphasized as often neglected.