Nagoya University
Theoretical Elementary Particle Physics Laboratory

Date&Time Mon May 16 2022 (11:00 - 12:00)
Speaker
Yohei Ema
Affiliation Minnesota University
Title CKM and muon EDM contributions to atomic/molecular EDMs
Abstract This talk is composed of two parts. In the first part, we calculate paramagnetic electric dipole moments (EDMs) induced by the standard model CKM phase. We find that the dominant contribution comes from the combination of the electroweak penguin diagrams and Delta I = 1/2 weak transitions in the baryon sector, and is calculable within chiral perturbation theory. This induces the semi-leptonic CP-odd operator C_S = 7e-16, corresponding to an equivalent electron EDM d_e = 1e-35 ecm. While still far from the current observational limits, this result is three orders of magnitude larger than previously believed. In the second part, we derive indirect constraints on muon EDM from atomic/molecular EDM experiments, motivated by the current discrepancy in muon g − 2 and future dedicated efforts to directly measure muon EDM. The muon EDM induces a CP-odd light-by-light operator BE^3, which sources atomic EDMs with the help of strong nuclear electromagnetic fields. We obtain |d_mu| < 6e-20 ecm from the diamagnetic 199Hg atom, and |d_mu| < 2e-20 ecm from the paramagnetic ThO molecule, respectively.
Remarks
Slide/Video video1