TY - JOUR
T1 - Probing CP violation in photon self-interactions with cavities
AU - Gorghetto, Marco
AU - Perez, Gilad
AU - Savoray, Inbar
AU - Soreq, Yotam
PY - 2021/10/1
Y1 - 2021/10/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85116852244&partnerID=8YFLogxK
U2 - 10.1007/JHEP10(2021)056
DO - 10.1007/JHEP10(2021)056
M3 - Article
SN - 1029-8479
VL - 2021
SP - 1
EP - 29
JO - The journal of high energy physics
JF - The journal of high energy physics
IS - 10
M1 - 56
ER -