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How to measure the spin of invisible states in $e^+e^- \to \gamma + X$

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arxiv 2308.09746 v2 pith:V2TYCGL7 submitted 2023-08-18 hep-ph

classification hep-ph
keywords invisiblephotonstategammahiddenmeasurementproductionspin
verification ladder T0 review T1 audit T2 compute T3 formal
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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

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Dark Higgs-strahlung at Belle II: A distinctive dark sector signature with displaced vertices and missing energy

    hep-ph 2025-08 conditional novelty 7.0 of 10

    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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