Nuclear effects on the longitudinal structure function at small x

Details Nuclear effects on the longitudinal structure function at small x Nuclear effects on the longitudinal structure function at small x

2010-05-12

arxiv.org/abs/1005.2035v3

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 12 pages, 4 eps figures; v2: reference added; v3: comments and references added, results and conclusions unchanged, fin

Scientific paper

We discuss the longitudinal structure function in nuclear DIS at small $x$. We work within the framework of universal parton densities obtained in DGLAP analyses at NLO. We show that the nuclear effects on the longitudinal structure function closely follow those on the gluon distribution. The error analyses available from newest sets of nuclear PDFs also allow to propagate the uncertainties from present data. In this way, we evaluate the minimal sensitivity required in future experiments for this observable to improve the knowledge of the nuclear glue. We further discuss the uncertainties on the extraction of $F_2$ off nuclear targets, introduced by the usual assumption that the ratio $F_L/F_2$ is independent of the nuclear size. We focus on the kinematical regions relevant for future lepton-ion colliders.

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