Search for the Pair Production of Dark Particles X with K0L? XX, X ? ??

C. Lin,J. K. Ahn,J. M. Choi, M. S. Farrington, M. Gonzalez, N. Grethen, Y. B. Hsiung,T. Inagaki, 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. Nagkiri, H. Nanjo, T. Nomura, K. Ono, J. C. Redeker, T. Sato, V. Sasse, T. Shibata, N. Shimnizu, T. Shinkawa, S. Shinohara, K. Shiomi, R. Shiraishi, S. Suzuki,Y. Tajima, Y. -C. Tung,Y. W. Wah, H. Watnabe, T. Wu, T. Yamanaka, H. Y. Yoshida

PHYSICAL REVIEW LETTERS（2023）

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摘要

We present the first search for the pair production of dark particles X via K0L -> 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/c2 and 210-240 MeV/c2. This sets upper limits on the branching fractions as B(K0L -> XX) < (1-4) x 10-7 and B(K0L -> XX) < (1-2) x 10-6 at the 90% confidence level for the two mass regions, respectively.

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