Search for a light pseudoscalar particle in the decay $K^0_L \to ��^0 ��^0 X$

Tung, Y. C., Hsiung, Y. B., Wu, M. L., Chen, K. F., Ahn, J. K., Akune, Y., Baranov, V., Comfort, J., Doroshenko, M., Fujioka, Y., Inagaki, T., Ishibashi, S., Ishihara, N., Ishii, H., Iwai, E., Iwata, T., Kato, I., Kobayashi, S., Komatsubara, T. K., Kurilin, A. S., Kuzmin, E., Lednev, A., Lee, H. S., Lee, S. Y., Lim, G. Y., Ma, J., Matsumura, T., Moisseenko, A., Morii, H., Morimoto, T., Nakano, T., Nanjo, H., Nix, J., Nomura, T., Nomachi, M., Ogata, R., Okuno, H., Omata, K., Perdue, G. N., Podolsky, S., Sakashita, K., Sasaki, T., Sasao, N., Sato, H., Sato, T., Sekimoto, M., Shinkawa, T., Sugaya, Y., Sugiyama, A., Sumida, T., Suzuki, S., Tajima, Y., Takita, S., Tsamalaidze, Z., Tsukamoto, T., Wah, Y., Watanabe, H., Yamaga, M., Yamanaka, T., Yoshida, H. Y., Yoshimura, Y., Zheng, Y.

doi:10.48550/arxiv.0810.4222

We performed a search for a light pseudoscalar particle $X$ in the decay $K_L^0->pi0pi0X$, $X->��$ with the E391a detector at KEK. Such a particle with a mass of 214.3 MeV/$c^2$ was suggested by the HyperCP experiment. We found no evidence for $X$ and set an upper limit on the product branching ratio for $K_L^0->pi0pi0X$, $X->��$ of $2.4 \times 10^{-7}$ at the 90% confidence level. Upper limits on the branching ratios in the mass region of $X$ from 194.3 to 219.3 MeV/$c^2$ are also presented.

5 pages, 5 figures

Search for a light pseudoscalar particle in the decay $K^0_L \to ��^0 ��^0 X$

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