Abstract
Regge theory provides an excellent description of small-x structure-function data from Q 2 = 0 up to the highest available values. The large-Q 2data should also be described by perturbative QCD: the two descriptions must agree in the region where they overlap. However, at present there is a serious lack in our understanding of how to apply perturbative QCD at small x. The usual lowest-order or next-to-lowest order expansion is not valid, at least not until Q 2becomes much larger than is usually assumed; a resummation is necessary, but as yet we do not know how to do this resummation.
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Landshoff, P. (2000). Soft and Hard Pomerons. In: Grindhammer, G., Kniehl, B.A., Kramer, G. (eds) New Trends in HERA Physics 1999. Lecture Notes in Physics, vol 546. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-46522-7_30
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DOI: https://doi.org/10.1007/3-540-46522-7_30
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