Probing CP violation in photon self-interactions with cavities

Marco Gorghetto, Gilad Perez, Inbar Savoray, Yotam Soreq

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

In this paper we study CP violation in photon self-interactions at low energy. These interactions, mediated by the effective operator FFFF˜ , where (F˜) F is the (dual) electromagnetic field strength, have yet to be directly probed experimentally. Possible sources for such interactions are weakly coupled light scalars with both scalar and pseudoscalar couplings to photons (for instance, complex Higgs-portal scalars or the relaxion), or new light fermions coupled to photons via dipole operators. We propose a method to isolate the CP-violating contribution to the photon self-interactions using Superconducting Radio-Frequency cavities and vacuum birefringence experiments. In addition, we consider several theoretical and experimental indirect bounds on the scale of new physics associated with the above effective operator, and present projections for the sensitivity of the proposed experiments to this scale. We also discuss the implications of these bounds on the CP-violating couplings of new light particles coupled to photons.

Original languageEnglish
Article number56
Pages (from-to)1-29
Number of pages29
JournalThe journal of high energy physics
Volume2021
Issue number10
DOIs
Publication statusPublished - 1 Oct 2021

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