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  • Search for a dark photon and an invisible dark Higgs boson in $\mu^+\mu^-$ and missing energy final states with the Belle II experiment
    Aggarwal, L; Aloisio, A; Ky, N. Anh; Bansal, S; Becker, J; Bernieri, E; Bertemes, M; Biswas, D; Bodrov, D; Budano, A; Chekelian, V; Chen, Y. Q; Chilikin, K; Cho, S. -J; Dey, S; Doležal, Z; Jiménez, I. Domínguez; Eliachevitch, M; Finocchiaro, G; Godang, R; Goldenzweig, P; Hayasaka, K; Hayashii, H; Hoek, M; Hsu, C. -L; Iijima, T; Inguglia, G; Ishikawa, A; Ito, S; Itoh, R; Jacobs, W. W; Jang, E. -J; Jin, Y; Kaliyar, A. B; Kichimi, H; Kim, K. -H; Korobov, A; Kowalewski, R; Kraetzschmar, T. M. G; Kwon, Y. -J; Lacaprara, S; Lange, J. S; Laurenza, M; Leboucher, R; Lee, S. C; Li, Y. B; Lieret, K; Liventsev, D; Longo, S; Lueck, T; Martel, L; Masuda, M; McKenna, J. A; Merola, M; Metzner, F; Miller, C; Molina-Gonzalez, N; Mrvar, M; Nakamura, I; Nakamura, K. R; Nakao, M; Nakayama, H; Nayak, L; Nayak, M; Ogawa, S; Pakhlova, G; Park, S. -H; Paul, S; Pedlar, T. K; Remnev, M; Rizzo, G; Scavino, B; Selce, A; Senyo, K; Serrano, J; Shillington, T; Shiu, J. -G; Singh, J. B; Stroili, R; Takizawa, M; Tanida, K; Tanigawa, H; Tiwary, R; Tonelli, D; Uematsu, Y; Urquijo, P; Vahsen, S. E; van Tonder, R; Vitale, L; Wakeling, H. M; Wang, M. -Z; Warburton, A; Watanabe, M; Watanuki, S; Welsch, M; Windel, H; Yabsley, B. D; Yang, S. B; Zhang, Y; Žlebčík, R

    arXiv (Cornell University), 07/2022
    Journal Article

    Phys. Rev. Lett. 130, 071804 (2023) The dark photon $A^\prime$ and the dark Higgs boson $h^\prime$ are hypothetical particles predicted in many dark sector models. We search for the simultaneous production of $A^\prime$ and $h^\prime$ in the dark Higgsstrahlung process $e^{+}e^{-}\rightarrow A^\prime \, h^\prime$ with $A^\prime \rightarrow \mu^+\mu^-$ and $ h^\prime$ invisible in electron-positron collisions at a center-of-mass energy of 10.58 GeV collected by the Belle II experiment in 2019. With an integrated luminosity of 8.34 fb$^{-1}$, we observe no evidence for signal. We obtain exclusion limits at 90% Bayesian credibility in the range of 1.7--5.0 fb on the cross section and in the range of $1.7 \times10^{-8}$--$200 \times10^{-8}$ on the effective coupling $\varepsilon^2 \times \alpha_D$ for the $A^\prime$ mass in the range of 4.0 GeV/$c^2$ $< M_{A^\prime}< 9.7$ GeV/$c^2$ and for the $h^\prime$ mass $M_{h^\prime} < M_{A^\prime}$, where $\varepsilon$ is the mixing strength between the standard model and the dark photon and $\alpha_D$ is the coupling of the dark photon to the dark Higgs boson. Our limits are the first in this mass range.

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