A phenomenological analysis of the longitudinal structure function at small $x$ and low $Q^2$

Details A phenomenological analysis of the longitudinal structure function at small $x$ and low $Q^2$ A phenomenological analysis of the longitudinal structure function at small $x$ and low $Q^2$

2004-06-21

arxiv.org/abs/hep-ph/0406230v2

Eur.Phys.J.C37:299-305,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 3 figures. Version to be published in Eur. Phys. J. C

Scientific paper

10.1140/epjc/s2004-01998-6

The longitudinal structure function in deep inelastic scattering is one of the observables from which the gluon distribution can be unfolded. Consequently, this observable can be used to constrain the QCD dynamics at small $x$. In this work we compare the predictions of distinct QCD models with the recent experimental results for $F_L(x,Q^2)$ at small $x$ and low $Q^2$ obtained by the H1 collaboration. We focus mainly on the color dipole approach, selecting those models which include saturation effects. Such models are suitable at this kinematical region and also resum a wide class of higher twist contributions to the observables. Therefore, we investigate the influence of these corrections to $F_L$ in the present region of interest.

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