Analytic Approximation to the GLAP evolution of $F_2(x,Q^2)$ in the small-$x$ region
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We propose a systematic approximation scheme for solving GLAP evolution equations at small Bjorken-$x$. The approximate solutions interpolate smoothly between hard (singular as $x^{-(1+λ)}$, $λ> 0$) and soft (singular at most as $x^{-1}$) initial conditions and may be applied in a wide range of $Q^2$. The small-$x$ behavior of $F_2^p(x,Q^2)$ which is extracted from a fit to HERA data agrees with results from a global fit.
15 pages, Latex, including 4 figures
15 pages, Latex, including 4 figures