Chargino Pair Production at LEP2 with Broken R-Parity: 4-jet Final States

We study the pair production of charginos in e + e − -collisions followed by the decay via R-parity violating LQ ¯ D operators. We determine the complete matrix element squared for chargino decays via LQ ¯ D or LL ¯ E operators. We find regions in MSSM parameter space where the chargino mass is 52 . 5 GeV and the R-parity violating decays of the charginos dominate the gauge decays to neutralinos. At LEP2 this then leads to additional 4 jet events which could explain the excess recently observed by ALEPH.