CP asymmetries in the supersymmetric trilepton signal at the LHC

TL;DR

This paper investigates CP asymmetries in neutralino-chargino production and decay at the LHC within the CP-violating MSSM, providing analytical formulas and numerical analysis to assess the potential for observing CP violation.

Contribution

It introduces analytical formulas for CP asymmetries in neutralino-chargino processes and evaluates their observability at the LHC, highlighting the potential to detect CP violation.

Findings

CP asymmetries can reach several 10% for light supersymmetric particles

Analytical formulas for production and decay processes are derived

The LHC has potential to observe CP violation in the trilepton channel

Abstract

In the CP-violating Minimal Supersymmetric Standard Model, we study the production of a neutralino-chargino pair at the LHC. For their decays into three leptons, we analyze CP asymmetries which are sensitive to the CP phases of the neutralino and chargino sector. We present analytical formulas for the entire production and decay process, and identify the CP-violating contributions in the spin correlation terms. This allows us to define the optimal CP asymmetries. We present a detailed numerical analysis of the cross sections, branching ratios, and the CP observables. For light neutralinos, charginos, and squarks, the asymmetries can reach several 10%. We estimate the discovery potential for the LHC to observe CP violation in the trilepton channel.