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. 2023 Mar 17;130(11):111801.
doi: 10.1103/PhysRevLett.130.111801.

Search for the Pair Production of Dark Particles X with K_{L}^{0}→XX, X→γγ

C Lin  1 , J K Ahn  2 , J M Choi  2 , M S Farrington  1 , M Gonzalez  3 , N Grethen  1 , Y B Hsiung  4 , T Inagaki  5 , I Kamiji  6 , E J Kim  7 , J L Kim  7 , H M Kim  7 , K Kawata  3 , A Kitagawa  3 , T K Komatsubara  5   8 , K Kotera  3 , S K Lee  7 , J W Lee  2 , G Y Lim  5   8 , Y Luo  1 , T Matsumura  9 , K Nakagiri  6 , H Nanjo  3 , T Nomura  5   8 , K Ono  3 , J C Redeker  1 , T Sato  5 , V Sasse  1 , T Shibata  3 , N Shimizu  3 , T Shinkawa  9 , S Shinohara  6 , K Shiomi  5   8 , R Shiraishi  3 , S Suzuki  10 , Y Tajima  11 , Y-C Tung  4 , Y W Wah  1 , H Watanabe  5   8 , T Wu  4 , T Yamanaka  3 , H Y Yoshida  11 ; KOTO Collaboration
Affiliations

Search for the Pair Production of Dark Particles X with K_{L}^{0}→XX, X→γγ

C Lin et al. Phys Rev Lett. .

Abstract

We present the first search for the pair production of dark particles X via K_{L}^{0}→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 B(K_{L}^{0}→XX)<(1-4)×10^{-7} and B(K_{L}^{0}→XX)<(1-2)×10^{-6} at the 90% confidence level for the two mass regions, respectively.

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