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How to measure the spin of invisible states in $e^+e^- \to \gamma + X$
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abstract
We examine the production of an invisible state $X$ together with a photon, $e^+e^- \to \gamma +X$, at electron positron colliders and present measurement strategies that can detect the spin of the invisible state as well as the underlying production mechanism, based on the angular distribution of the final state photon, the cross sections for polarized initial states and the photon polarization. Our measurement strategy can be used to identify whether the invisible state is a hidden photon or an axion. The results are compared with a detailed analysis of the Standard Model background and we calculate the sensitivity reach for searches for axions and hidden photons at Belle II.
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Cited by 1 Pith paper
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Dark Higgs-strahlung at Belle II: A distinctive dark sector signature with displaced vertices and missing energy
Dark Higgs-strahlung, with or without an initial-state photon, gives a displaced-vertex plus missing-energy signature that could make Belle II more sensitive to dark photon models than single-photon searches alone.
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