How to measure the spin of invisible states in e + e − → γ + X

Bauer, Martin; Nordahl Erner, Sofie

Abstract

We examine the production of an invisible state X together with a photon, eþe− → γ þ 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 axionsand hidden photons at Belle II.

Citation

Bauer, M., & Nordahl Erner, S. (2023). How to measure the spin of invisible states in e + e − → γ + X. Physical Review D, 108, Article 115013. https://doi.org/10.1103/PhysRevD.108.115013

• Journal Article Type: Article
• Acceptance Date: Nov 13, 2023
• Online Publication Date: Dec 12, 2023
• Publication Date: 2023-12
• Deposit Date: Feb 6, 2024
• Publicly Available Date: Feb 6, 2024
• Journal: Physical Review D
• Print ISSN: 2470-0010
• Electronic ISSN: 2470-0029
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 108
• Article Number: 115013
• DOI: https://doi.org/10.1103/PhysRevD.108.115013
• Public URL: https://durham-repository.worktribe.com/output/2227944