2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/41305Consecutively to the chargino system, $\tilde{chi}^pm$, in which the SU(2) gaugino parameter $M_2$, the higgsino mass parameter $μ$ and $\tanβ$ can be determined, the remaining fundamental supersymmetry parameter, the U(1) gaugino mass $M_1$ can be analysed in the neutralino system, $\tildeχ^0$, including its modulus and phase in CP--noninvariant theories. First experimental hints on CP violation can be seen in the threshold behaviour of neutralino production.3 pages, 3 eps figures, Contribution to Snowmass 2001 Summer StudyHigh Energy Physics - Phenomenologytext