Abstract
We study the phenomenology of electric dipole moments (EDMs) induced in various scalar leptoquark models. We consider generic leptoquark couplings to quarks and leptons and match to Standard Model effective field theory. After evolving the resulting operators to low energies, we connect to EDM experiments by using up-to-date hadronic, nuclear, and atomic matrix elements. We show that current experimental limits set strong constraints on the possible CP-violating phases in leptoquark models. Depending on the quarks and leptons involved in the interaction, the existing searches for EDMs of leptons, nucleons, atoms, and molecules all play a role in constraining the CP-violating couplings. We discuss the impact of hadronic and nuclear uncertainties as well as the sensitivities that can be achieved with future EDM experiments. Finally, we study the impact of EDM constraints on a specific leptoquark model that can explain the recent B-physics anomalies.
Highlights
The search for electric dipole moments (EDMs) has grown into a rich field with ongoing experiments to measure EDMs of muons, neutrons, various atoms and molecules, and exciting efforts to measure EDMs of protons and light nuclei in electromagnetic storage rings, see e.g. refs. [11,12,13] for recent reviews
We study the phenomenology of electric dipole moments (EDMs) induced in various scalar leptoquark models
We have investigated how electric dipole moments of various systems are induced in models involving scalar leptoquarks
Summary
Scalar leptoquarks couple in various ways to SM fields depending on their gauge representations. We will focus on the leptoquark representations that allow for both left- and right-handed couplings to fermions, as these give significant contributions to CP-violating observables and thereby give rise to the most interesting EDM phenomenology. Leptoquark models without this requirement still contribute to EDMs; in that case, the generation of a CP-violating phase necessarily involves a flavor change, which has to be reversed to induce EDMs by an additional nondiagonal weak interaction, rendering these contributions much smaller. We refrain from discussing this class of models in the following
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