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We present an exploratory study of gaugino-pair production in polarized andunpolarized hadron collisions, focusing on the correlation of beam polarizationand gaugino/Higgsino mixing in the general Minimal Supersymmetric StandardModel. Helicity-dependent cross sections induced by neutral and chargedelectroweak currents and squark exchanges are computed analytically in terms ofgeneralized charges, defined similarly for chargino-pair, neutralino-charginoassociated, and neutralino-pair production. Our results confirm and extendthose obtained previously for negligible Yukawa couplings and nonmixingsquarks. Assuming that the lightest chargino mass is known, we show numericallythat measurements of the longitudinal single-spin asymmetry at the existingpolarized pp collider RHIC and at possible polarization upgrades of theTevatron or the LHC would allow for a determination of the gaugino/Higgsinofractions of charginos and neutralinos. The theoretical uncertainty coming fromfactorization scale and squark mass variations and the expected experimentalerror on the lightest chargino mass is generally smaller than the one inducedby the polarized parton densities, so that more information on the latter wouldconsiderably improve on the analysis.

Gaugino-pair production in polarized and unpolarized hadron collisions