An investigation of quark and diquark fragmentation in νp and anti νp charged current interactions in BEBC

Distributions of Feynman-x have been determined for positive and negative pions in charged current neutrino-proton and antineutrino-proton reactions with hadronic energy W>3 GeV and Bjorken-xsub(B)>0.1. The distributions have been corrected for experimental effects such as measurement errors, uncertainties in estimating the n eutrino energy and particle misidentification. In the frame work of the quark-parton model the distributions yield information about the fragmentation of forward going u and d quarks and backward going uu and ud diquarks. Approximate Feynman scaling is observed for the invariant Feynman-xsub(F) distributions. They can be fitted by a power law of the form (1- vertical stroke xsub(F) vertical stroke )sup(n) as suggested by the dimensional counting rules. Simple isospin relations predicted by the quark-parton model are fulfilled. The fragmentation of diquarks is compared with that of protons into πsup(+-). (orig.)