Polarization-independent CP-odd Observable in e^+e^- Chargino Production at One Loop

TL;DR

This paper investigates CP violation in unpolarized e^+e^- collisions producing charginos, highlighting the significance of vertex and self-energy corrections over box diagrams in certain scenarios.

Contribution

It introduces a polarization-independent CP-odd observable in chargino production at one loop, emphasizing the roles of different loop corrections.

Findings

Vertex and self-energy corrections can dominate over box diagrams in certain conditions.

The study provides insights into CP violation effects in chargino production without beam polarization.

Comments on CP violation in chargino decay are included.

Abstract

We discuss CP violation in the process e^+e^- \to \tilde\chi^+_i\tilde\chi^-_j with unpolarized beams. When the scalars are heavy, the box-diagram results constitute a major part of the full result. However, there are situations when the vertex and self-energy corrections dominate over the box diagrams. We also comment on CP violation in the final chargino decay.