Joint Institute for Nuclear Research Relativistic ... - Index of - JINR

SMALL x BEHAVIOR OF PARTON DENSITIES
A.V. Kotikov 1†
(1) Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Russia
† E-mail: kotikov@theor.jinr.ru
It is shown that a Bessel-like behavior of the structure function F 2 at small x, obtained
for a flat initial condition in the DGLAP evolution equations [1, 2], leads to good
agreement with the deep inelastic scattering experimental data [3] from HERA.
Some disagreement at Q 2 ∼ 1 Gev 2 can be explained by the importance of the BFKL
contribution [4] in this area.
Figure 4: x dependence of the deep inelastic structure function F 2 (x,Q 2 ) in bins of Q 2 [2].
The experimental data from H1 (open points) and ZEUS (solid points) [3] are compared
with the NLO fits for Q 2 ≥ 0.5 GeV 2 implemented with the canonical (solid lines), frozen
(dot-dashed lines), and analytic (dashed lines) versions of the strong-coupling constant.
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