vN: DETERMINATION OF STRUCTURE FUNCTIONS

Since the 1980 conferences a large number of results on structure functions have been reported from neutrino experiments. New data are available from v and v scattering on protons and neutrons. Measurements of the cross section ratios avn/avp as function of energy and scaling variables x and y allow the extraction of differences between the u- and d-quark momentum distributions. Final results on structure functions from v experiments on isoscalar targets exhibit clearly scaling violations. QCD fits to the data yield values of the scale breaking parameter A = 0.1- 0.2 GeV. From a new measurement of the Q2 evolution of the antiquarks together with F2 data the gluon x distribution has been extracted. The discrepancies in the measurement of the total cross section are still unresolved. 1. Recent results from v and v scattering on protons and neutrons The study of proton and neutron structure functions is still a domain ot bunble chamber experiments. within tne last year, new data nave been reported by the 7 ' BNL vNe experiment in the low energy range (1-10 GeV) and by various high energy experiments at FNAL and CERN, see Table 1. Typical event rates in these experiments are 1000-5000 events recorded in wide band beam exposures