Impact of higher orders in the high-energy limit of QCD

Gavin Salam
Paris, LPTHE

Since the earliest days of QCD there have been investigations into the high-energy limit of the theory. The cornerstone prediction of the field was a spectacularly rapid rise of perturbative cross sections at high energies. This, however, is not borne out by the data. The past decade has seen extensive work on trying to understand this apparent contradiction, in particular via the calculation of higher order corrections. This talk will give an introduction to the origin of the rise of QCD cross sections, showing also the comparisons to data. We will then illustrate some difficulties that arise in the presence of next-to-leading corrections and discuss the extent to which it is possible to make robust predictions including further higher-order corrections. -

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