Measurement of multi-jet cross sections in charged current e±p scattering with ZEUS at HERA

Jet cross sections were measured in charged current deep inelastic e±p
scattering at high boson virtualities Q2 with the ZEUS detector at
HERA II using an integrated luminosity of 360 pb-1. Differential
cross sections are presented for inclusive-jet production as functions
of Q2, Bjorken x and the jet transverse energy and pseudorapidity. The
dijet invariant mass cross section is also presented. Observation of
three- and four-jet events in charged-current e±p processes is
reported for the first time. The predictions of next-to-leading-order
(NLO) QCD calculations are compared to the measurements. The measured
inclusive-jet cross sections are well described in shape and
normalization by the NLO predictions. The data have the potential to
constrain the u and d valence quark distributions in the proton if
included as input to global fits.