Probing CP violation in photon self-interactions with cavities

A bstract In this paper we study CP violation in photon self-interactions at low energy. These interactions, mediated by the effective operator FFF F ˜ , where ( F ˜ ) F is the (dual) electromagnetic field strength, have yet to be directly probed experimentally. Possible sources for such interaction...

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Published inThe journal of high energy physics Vol. 2021; no. 10; pp. 1 - 29
Main Authors Gorghetto, Marco, Perez, Gilad, Savoray, Inbar, Soreq, Yotam
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer Berlin Heidelberg 06.10.2021
Springer Nature B.V
SpringerOpen
Subjects
Atoms & subatomic particles
Beyond Standard Model
Birefringence
Classical and Quantum Gravitation
Couplings
CP violation
Dipoles
Electromagnetic fields
Electromagnetism
Elementary Particles
Experiments
Fermions
Field strength
High energy physics
Light
Other experiments
Photons
Physics
Physics and Astronomy
Polarization
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Regular Article - Experimental Physics
Relativity Theory
Scalars
String Theory
Other experiments
Polarization
Beyond Standard Model
CP violation
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Summary:A bstract In this paper we study CP violation in photon self-interactions at low energy. These interactions, mediated by the effective operator FFF F ˜ , 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.
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP10(2021)056