CP observables with spin-spin correlations in chargino production

TL;DR

This paper investigates CP-violating effects in chargino production and decay in electron-positron collisions, proposing new observables based on spin correlations that can detect CP violation within the MSSM framework.

Contribution

It introduces novel CP-sensitive observables utilizing spin-spin correlations and polarization effects, enhancing detection of CP violation in supersymmetric chargino processes.

Findings

Identification of CP-sensitive observables using T-odd products

Dependence of observables on chargino polarization states

Framework applicable within the MSSM with complex parameters

Abstract

We study the CP-violating terms of the spin-spin correlations in chargino production e+e- -> chi^+/-_1 chi^-/+_2, and their subsequent two-body decays into sneutrinos plus leptons. We propose novel CP-sensitive observables with the help of T-odd products of the spin-spin terms. These terms depend on the polarizations of both charginos, with one polarization perpendicular to the production plane. We identify two classes of CP-sensitive observables; one requires the reconstruction of the production plane, the other not. Our framework is the Minimal Supersymmetric Standard Model with complex parameters.