Speaker
Description
The proton structure function $F_2$ in the low $Q^2$, low $x$ region
is constructed and analysed using the generalised vector meson
dominance representation with the large $Q^2$ spectral function
calculated from the analytic continuation of the parton model
structure function. This is an update of the work published in
Z. Phys.{\bf C}43 (1989) 251 and Phys. Lett. {\bf B} 295 (1992) 263, with
various modern parton parametrisations. Possible effects of the
large $Q^2$ scaling violation on the low $Q^2$ part of the $F_2$
are investigated. Predictions of the model are compared with
available electroproduction measurements. The analysis permits
understanding of the transition from the perturbative to nonperturbative
regions (including photoproduction) and thus of the experimental
results. It may also be of a high practical value in radiative
correction procedures to be applied in extraction of structure
functions from the data e.g. in the future Electron-Ion Collider.
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