Probing CP-violation at colliders through interference effects in diboson production and decay

TL;DR

This paper introduces a CP-asymmetric observable for collider experiments, demonstrating its effectiveness in measuring CP-violating interactions in the gauge-boson sector, with potential sensitivity surpassing previous experiments.

Contribution

It defines a new CP-sensitive observable and evaluates its potential to measure CP-violation at the LHC, improving upon past experimental sensitivities.

Findings

Sensitivity at the 10^{-3} level with 100 fb^{-1} at LHC

Exceeds LEP sensitivity in measuring CP-violation

Potentially surpasses indirect constraints from electric dipole moments

Abstract

We define a CP-asymmetric observable that is sensitive to CP-violating interactions in the gauge-boson sector. We illustrate the utility of this observable by studying how well the LHC can measure the coefficient of a particular dimension-six WWZ operator. We find that sensitivity at the 10^{-3} level is possible at the LHC with 100 fb^{-1} of integrated luminosity, which would greatly exceed the sensitivity achieved at LEP, and would rival or may even better the indirect sensitivities inferred from related operators constrained by electric dipole moment experiments.