CP-sensitive spin-spin correlations in neutralino production at the ILC

Understand

We study the CP-violating terms of the spin-spin correlations in neutralino production and their subsequent two-body decays into sleptons plus leptons at the ILC.

• We analyze CP-sensitive observables with the help of T-odd products of the spin-spin terms.
• These terms depend on the polarizations of both neutralinos, with one polarization perpendicular to the production plane.
• We present a detailed numerical study of the CP-sensitive observables, cross sections, and neutralino branching ratios in the Minimal Supersymmetric Standard Model with complex parameters.