Complex τ Electric Dipole Moment from GeV-Scale New Physics
Abstract
Abstract Among the charged leptons, the τ electric dipole moment d τ is the least constrained. We show that the Im[ d τ ] imposes strong constraints on new physics that have yet to be discussed. Motivated in particular by the Super Tau-Charm Facility (STCF), which will provide a uniquely clean environment for precision τ -physics, we study the momentum-transfer dependence of d τ ( q 2 ) and compare the projected sensitivities of STCF and Belle II. Our analysis shows that an axion-like coupling of the τ lepton can induce sizable real and imaginary components of the EDM. The predicted EDM values may approach the present experimental sensitivities, making them accessible to future measurements at Belle II and the STCF.
Fields of Study & Subjects
Particle physics theoretical and experimental studies
Dark Matter and Cosmic Phenomena
Computational Physics and Python Applications
Publication details
- Journal / source
- Chinese Physics Letters
- Publisher
- IOP Publishing
- Volume
- 43
- Issue
- 3
- Pages
- 030201–030201
- Publication date
- 4 February 2026