Nuclear effects on the longitudinal structure function at small x

Abstract

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.

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

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Cited by in corpus (10)

• A Large Hadron Electron Collider at CERN: Report on the Physics and Design Concepts for Machine and Detector
• Global Analysis of Nuclear Parton Distributions
• Leading twist nuclear shadowing phenomena in hard processes with nuclei
• Nuclear Structure Functions at a Future Electron-Ion Collider
• Impact of nuclear dependence of R=σ_L/σ_T on antishadowing in nuclear structure functions
• Nuclear shadowing in deep inelastic scattering on nuclei: a closer look
• Parametrization of the nuclear structure function
• Nuclear Structure Functions at Low-$x$ in a Holographic Approach
• Investigation of Medium Modifications to ${}^{12}$C Structure Functions in the Resonance Region
• Longitudinal Structure Function at the Limit $x=Q^2/s$