Deep inelastic structure functions from HERA

Results on deep inelastic scattering obtained by H1 and ZEUS from the 1993 data taken at HERA are presented. The measurements of the charged current process provide first evidence for the damping of the total neutrino cross section at high energies by the W propagator. A comparison with neutral current scattering shows that at Q2 values above the W mass squared the weak cross section becomes comparable to the electromagnetic one. The structure function F2 of the proton was determined from neutral current scattering data The results confirm the steep rise of F2 towards small x below 10-2 seen previously by the two experiments albeit with much less statistics. The rise persists from the lowest Q2 values up to 500GeV2. The F2 data are in accord with logarithmic scaling violations in a new regime of low x and high Q2. An analysis of F2 data by ZEUS in terms of the total virtual photon proton cross section shows σtot(γ*p) to increase with the total γ*p c.m. energy, the increase being compatible with a linear rise. This is in striking contrast with the behaviour of the total cross section for real photons or for pp scattering ((orig.))