Gluons from logarithmic slopes of $F_2$ in the NLL approximation

Abstract

We make a critical, next-to-leading order, study of the accuracy of the Prytz relation, which is frequently used to extract the gluon distribution at small $x$ from the logarithmic slopes of the structure function $F_2$. We find that the simple relation is not generally valid in the Hera regime, but show that it is a reasonable approximation for gluons which are sufficiently singular at small $x$.

Comments: 5 pages+(3 figures append as PS file), INP Report 1666/PH (1994)