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

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.

16 pages, 15 figures, 1 table

References in corpus (16)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Study of the decay K+ => pi+,nu,nubar in the momentum region 140<Ppi<199 MeV/c
• LEP Shines Light on Dark Matter
• Revised constraints and Belle II sensitivity for visible and invisible axion-like particles
• The Low-Energy Effective Theory of Axions and ALPs
• Flavor probes of axion-like particles
• Search for Axionlike and Scalar Particles with the NA64 Experiment
• Search for Production of Invisible Final States in Single-Photon Decays of Upsilon(1S)
• Search for one large extra dimension with the DELPHI detector at LEP
• Invisible and displaced dark matter signatures at Belle II
• Supernova bound on Axion-Like Particles coupled with electrons
• Invisible decays of axion-like particles: constraints and prospects
• The first search for bosonic super-WIMPs with masses up to 1 MeV/c${}^2$ with GERDA
• A Consistent Theory of Kinetic Mixing and the Higgs Low-Energy Theorem
• Measurement of the photon polarization in ${\Lambda }_b\to \Lambda \gamma$ decays
• Polarization effects in the search for dark vector boson at $e^{+}{e}^{-}$ colliders

Cited by in corpus (1)

• Characterizing Dark Bosons at Chiral Belle