Reevaluation of heavy-fermion-induced electron EDM at three loops

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 $m_e/m_{\mu }$ or $m_e/m_{\tau }$ 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.

8 pages, 2 figures

References in corpus (6)

• Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm
• Measurement of the permanent electric dipole moment of the neutron
• Reevaluation of Neutron Electric Dipole Moment with QCD Sum Rules
• Tau anomalous magnetic moment form factor at Super B/Flavor factories
• Search for a muon EDM using the frozen-spin technique
• Electric dipole moments, from e to tau