Soft and Hard Pomerons

  • Peter Landshoff
Conference paper
First Online:
Part of the Lecture Notes in Physics book series (LNP, volume 546)

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.

Keywords

Structure Function Branch Point Perturbative Expansion Regge Theory High Twist 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • Peter Landshoff
    • 1
  1. 1.DAMTPUniversity of CambridgeCambridgeEngland

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