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\sc{Multijet Production in Charged Current \\ Deep Inelastic Scattering with ZEUS at HERA}
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\noindent Differential jet cross sections have been measured in charged current deep inelastic $e^{\pm}p$ scattering at high boson virtualities $Q^2$ with the ZEUS detector at HERA using an integrated luminosity of 0.36~$\mbox{fb}^{-1}$. Jets were identified using the $k_{T}$ cluster algorithm in the longitudinally invariant inclusive mode. Polarized and unpolarized-corrected cross sections are presented for inclusive-jet production as functions of $Q^2$, Bjorken $x$ and the jet transverse energy and pseudorapidity. The dijet invariant mass cross section is also presented. Observation of three-jet events in charged-current processes is reported for the first time. The predictions of leading-logarithm parton-shower Monte Carlo models and next-to-leading-order QCD calculations are compared to the measurements.
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