Neutralino Pair Production and 3-Body Decays at $e^{+}{e}^{-}$ Linear Colliders as Probes of CP Violation in the Neutralino System

In the CP-invariant supersymmetric theories, the steep S-wave (slow P-wave) rise of the cross section for any non-diagonal neutralino pair production in $e^{+}{e}^{-}$ annihilation, $e^{+}{e}^{-}\to {\tilde{\chi }}_i^0{\tilde{\chi }}_j^0$ ($i \neq j$), near threshold is accompanied by the slow P-wave (steep S-wave) decrease of the fermion invariant mass distribution of the 3-body neutralino decay, ${\tilde{\chi }}_i^0\to {\tilde{\chi }}_j^{0}f\bar{f}$ ($f=l$ or $q$), near the end point. These selection rules, unique to the neutralino system due to its Majorana nature, guarantee that the observation of simultaneous sharp S-wave excitations of the production cross section near threshold and the lepton and quark invariant mass distribution near the end point is a qualitative, unambiguous evidence for CP violation in the neutralino system.