Electric Dipole Moments from CP-Violating Scalar Leptoquark Interactions

TL;DR

This paper investigates how CP-violating scalar leptoquark interactions influence electric dipole moments in polar molecules, revealing that current experiments set strong constraints on these new physics scenarios.

Contribution

It demonstrates that scalar leptoquarks can induce significant electron EDM and NSID interactions, affecting molecular EDM measurements and providing new bounds on leptoquark models.

Findings

NSID interaction can dominate molecular response

Current experiments constrain electron EDM more strongly when including NSID effects

Scalar leptoquarks can generate observable CP-violating signals in molecules

Abstract

We analyze the implications of CP-violating scalar leptoquark (LQ) interactions for experimental probes of parity- and time-reversal violating properties of polar molecules. These systems are predominantly sensitive to the electric dipole moment (EDM) of the electron and nuclear-spin-independent (NSID) electron-nucleon interaction. The LQ model can generate both a tree-level NSID interaction as well as the electron EDM at one-loop order. Including both interactions, we find that the NSID interaction can dominate the molecular response. For moderate values of couplings, the current experimental results give roughly two orders of magnitude stronger limits on the electron EDM than one would otherwise infer from a sole-source analysis.