Multi-jet cross-sections in charged current e+- p scattering at HERA

Jet cross sections were measured in charged current deep inelastic e+-p scattering at high boson virtualities Q^2 with the ZEUS detector at HERA II using an integrated luminosity of 0.36 fb^-1. Differential 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- 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.

Note:

55 pages, 15 figures, 16 tables

positron p: colliding beams
positron p: annihilation
polarized beam
jet: electroproduction
charged current
jet: multiplicity
channel cross section
differential cross section
momentum transfer dependence
x-dependence

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