On the Singular Behaviour of Structure Functions at Low X
Abstract
We discuss the phenomenological extraction of the leading j-plane singularity from singlet structure functions Fs measured at small x. Using a saddle-point method we show that d ln Fs / d ln1 x is a suitable observable for this purpose in the region x 10-2. As an application, we confront and distinguish in a model-independent way structure function parametrizations coming from two different QCD evolution equations, namely the Lipatov (or BFKL) equation and the Gribov-Lipatov -Altarelli-Parisi (or GLAP) equation. Recent results at HERA are discussed in this framework.
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