Abstract
We study flavor changing neutral current decays of B and K mesons in the dark U(1)D model, with the dark photon/dark Z mass between 10 MeV and 2 GeV. Although the model provides an improved fit (compared to the standard model) to the differential decay distributions of B → K(∗)ℓ+ℓ−, with ℓ = μ, e, and Bs → ϕμ+μ−, the allowed parameter space is ruled out by measurements of atomic parity violation, K+ → μ+ + invisible decay, and \( {B}_s-{\overline{B}}_s \) mixing, among others. To evade constraints from low energy data, we extend the model to allow for (1) additional invisible ZD decay, (2) a direct vector coupling of ZD to muons, and (3) a direct coupling of ZD to both muons and electrons, with the electron coupling fine-tuned to cancel the ZD coupling to electrons via mixing. We find that only the latter case survives all constraints.
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Datta, A., Hammad, A., Marfatia, D. et al. Dark photon and dark Z mediated B meson decays. J. High Energ. Phys. 2023, 108 (2023). https://doi.org/10.1007/JHEP03(2023)108
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DOI: https://doi.org/10.1007/JHEP03(2023)108