Reevaluation of heavy-fermion-induced electron EDM at three loops
Yohei Ema, Ting Gao, Maxim Pospelov
Abstract
Motivated by improved limits on electric dipole moments (EDMs), we revisit the three-loop light-by-light mechanism that transmits CP violation from a heavy fermion to a light one. Applying it to the electron EDM induced by EDMs of heavier flavors, we find additional contributions at the order me/mμ or me/mτ that were missing before and that make the result 1.4 times larger. Consequently we improve bounds on the tau EDM, and update indirect limits on the muon EDM as well as charm and bottom quark color EDMs.
Topics & Concepts
MuonPhysicsParticle physicsFermionCharm (quantum number)QuarkElectronDipoleNuclear physicsCP violationElectric dipole momentQuantum mechanicsParticle physics theoretical and experimental studiesQuantum Chromodynamics and Particle InteractionsDark Matter and Cosmic Phenomena