Searching Dark Photons using displaced vertices at Belle II -- with backgrounds
arxiv(2023)
摘要
Dark photons in the MeV to GeV range with kinetic mixing of the order of
$\lesssim 10^{-4}-10^{-3}$ can be produced in significant numbers at low energy
colliders such as Belle II. Their decay length can be macroscopic raising the
hope for a fairly clean search via displaced vertices as proposed in Ref. [1].
However, even this is not background free. Here, we calculate and discuss
problematic backgrounds from displaced photon conversion and discuss their
potential impact on the sensitivity. In addition we also briefly consider the
dangers of prompt backgrounds.
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