Dark Photon Search at Yemilab, Korea
Seon-Hee Seo, Yeongduk Kim

TL;DR
This paper proposes a search for dark photons at Yemilab using an electron beam and a neutrino detector, aiming to improve sensitivity to dark photon properties across a range of masses with minimal background interference.
Contribution
It introduces a novel experimental setup at Yemilab for dark photon detection, achieving world-leading sensitivity estimates for kinetic mixing parameters in specific mass ranges.
Findings
Potential to set new sensitivity limits for dark photon kinetic mixing.
Ability to detect dark photon decays with high sensitivity.
Estimates of background-free detection capabilities.
Abstract
Dark photons are well motivated hypothetical dark sector particles that could account for observations that cannot be explained by the standard model of particle physics. A search for dark photons that are produced by an electron beam striking a thick tungsten target and subsequently interact in a 3 kiloton-scale neutrino detector in Yemilab, a new underground lab in Korea, is proposed. Dark photons can be produced by "darkstrahlung" or by oscillations from ordinary photons produced in the target and detected by their visible decays, "absorption" or by their oscillation to ordinary photons. By detecting the absorption process or the oscillation-produced photons, a world's best sensitivity for measurements of the dark-photon kinetic mixing parameter of at the 95\% confidence level (C.L.) could be obtained for dark photon masses…
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