Search for the Pair Production of Dark Particles $X$ with $K_L^0 \to XX$, $X \to \gamma\gamma$

A. Kitagawa; C. Lin; E. J. Kim; G. Y. Lim; H. M. Kim; H. Nanjo; H. Watanabe; H. Y. Yoshida; I. Kamiji; J. C. Redeker

arxiv: 2209.11019 · v3 · pith:7UY5MH5Jnew · submitted 2022-09-22 · ✦ hep-ex

Search for the Pair Production of Dark Particles X with K_L⁰ to XX, X to γγ

C. Lin , J. K. Ahn , J. M. Choi , M. S. Farrington , M. Gonzalez , N. Grethen , Y. B. Hsiung , T. Inagaki

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I. Kamiji E. J. Kim J. L. Kim H. M. Kim K. Kawata A. Kitagawa T. K. Komatsubara K. Kotera S. K. Lee J. W. Lee G. Y. Lim Y. Luo T. Matsumura K. Nakagiri H. Nanjo T. Nomura K. Ono J. C. Redeker T. Sato V. Sasse T. Shibata N. Shimizu T. Shinkawa S. Shinohara K. Shiomi R. Shiraishi S. Suzuki Y. Tajima Y.-C. Tung Y. W. Wah H. Watanabe T. Wu T. Yamanaka H. Y. Yoshida

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keywords darkgammamassmathcalpairparticlesproductionsearch

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We present the first search for the pair production of dark particles $X$ via $K_L^0\to XX$ with $X$ decaying into two photons using the data collected by the KOTO experiment. No signal was observed in the mass range of 40 - 110 MeV/c$^2$ and 210 - 240 MeV/c$^2$. This sets upper limits on the branching fractions as $\mathcal{B}(K_L^0 \to XX)$ $<$ (1-4) $\times$ 10$^{-7}$ and $\mathcal{B}(K_L^0 \to XX)$ $<$ (1-2) $\times$ 10$^{-6}$ at the 90% confidence level for the two mass regions, respectively.

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