Abstract submitted to the
         International Europhysics Conference on High Energy Physics
                  July 12 - 18, 2001, Budapest, Hungary
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              Measurements of jet substructure in charged current 
                      deep inelastic scattering at HERA

                    
                               ZEUS Collaboration





                                    Abstract


     The substructure of jets has been measured in charged current deep
     inelastic e^+ p scattering (DIS) at Q^2 > 200 GeV^2 with the
     ZEUS detector at HERA using an integrated luminosity of 42.7 pb^{-1}.
     Jets were identified in the laboratory frame using the
     longitudinally invariant k_T-cluster algorithm. Measurements of
     the jet shape and subjet multiplicity for jets with transverse
     energies E_T^jet > 15 GeV are presented. The jets are observed to
     become narrower and the mean subjet multiplicity to decrease as
     E_T^jet increases. The results have been compared to those for jets
     in neutral current DIS and found to be similar. Since the jets in
     charged and neutral current DIS are predominantly quark initiated,
     the similarity in the jet substructures indicates that the pattern
     of parton radiation within a quark jet is to a large extent 
     independent of the specific hard scattering process.