An Analytical Expression for the Non-Singlet Structure Functions at Small $x$ in the Double Logarithmic Approximation

摘要

A simple analytic expression for the non-singlet structure function $f_{NS}$is given. The expression is derived from the result of Ref. [1] obtained by low$x$ resummation of the quark ladder diagrams in the double logarithmicapproximation of perturbative QCD.