Small x: Two Pomerons!
A Donnachie, P V Landshoff
Abstract
Regge theory provides a very simple and economical description of data for (i) the proton structure function with x<0.07 and all available Q2 values, (ii) the charm structure function, and (iii) gamma p --> J/psi p. The data are all in agreement with the assumption that there is a second pomeron, with intercept about 1.4 . They suggest also that the contribution from the soft pomeron is higher twist. This means that there is an urgent need to make perturbative evolution compatible with Regge theory at small and not-so-small x, and to reassess the magnitude of higher-twist contributions at quite small x.
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