Comparison of electric dipole moments and the Large Hadron Collider for probing CP violation in triple boson vertices

TL;DR

This paper compares the effectiveness of electric dipole moment measurements and LHC diboson production in detecting CP violation beyond the Standard Model, emphasizing EDMs' superior sensitivity especially in supersymmetric scenarios.

Contribution

It provides a detailed comparison showing EDM experiments are generally more sensitive than collider processes for probing CP violation in triple boson vertices, especially with heavy sfermions.

Findings

EDM experiments are more powerful than LHC diboson processes in detecting CP violation.

Next-generation EDM experiments could surpass LHC sensitivities.

CP violating effects in EDMs appear at two-loop level, but still dominate collider signals.

Abstract

CP violation from physics beyond the Standard Model may reside in triple boson vertices of the electroweak theory. We review the effective theory description and discuss how CP violating contributions to these vertices might be discerned by electric dipole moments (EDM) or diboson production at the Large Hadron Collider (LHC). Despite triple boson CP violating interactions entering EDMs only at the two-loop level, we find that EDM experiments are generally more powerful than the diboson processes. To give example to these general considerations we perform the comparison between EDMs and collider observables within supersymmetric theories that have heavy sfermions, such that substantive EDMs at the one-loop level are disallowed. EDMs generally remain more powerful probes, and next-generation EDM experiments may surpass even the most optimistic assumptions for LHC sensitivities.