Abstract
The electron-proton collider HERA opens a new and interesting kinematic region in deep inelastic scattering (DIS) at very low x -Bjorken ( x > 10 −4 ). The measurements of the proton structure function F 2 from 1993 data confirm the results obtained from the first data taken in 1992, which showed a rise of the structure function at low x in both the H1 and ZEUS experiments. The rise of the F 2 structure function is interpreted as a rise of the parton densities in the proton with decreasing x . Their evolutions can be described by the conventional DGLAP equations or by the BFKL equations, but different predictions are obtained from the two prescriptions for the DIS hadronic final state We present differences in the low x region between the observed events and models based on the DGLAP-evolution equations.
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