General CPT-even dimension-five nonminimal couplings between fermions and photons yielding EDM and MDM

TL;DR

This paper introduces a new class of CPT-even, Lorentz-violating nonminimal couplings between fermions and photons that generate EDM and MDM, and uses experimental data to set stringent bounds on these interactions.

Contribution

It proposes a novel dimension-five CPT-even nonminimal coupling framework between fermions and photons that does not involve higher derivatives.

Findings

Set upper bounds of 10^{-20} and 10^{-25} (eV)^{-1} on the couplings.

Introduced a new class of Lorentz-violating interactions affecting fermion-photon dynamics.

Analyzed implications for electron EDM and MDM measurements.

Abstract

In this letter, we examine a new class of CPT-even nonminimal interactions, between fermions and photons, deprived of higher order derivatives, that yields electric dipole moment (EDM) and magnetic dipole moment (MDM) in the context of the Dirac equation. The couplings are dimension-five CPT-even and Lorentz-violating nonminimal structures, composed of a rank-2 tensor, $T_{\mu\nu}$, the electromagnetic tensor, and gamma matrices, being addressed in its axial and non-axial Hermitian versions, and also comprising general possibilities. We then use the electron's anomalous magnetic dipole moment and electron electric dipole moment measurements to reach upper bounds of $1$ part in $10^{20}$ and $10^{25}$ (eV )$^{-1}$.