Twist expansion of the nucleon structure functions, F2 and FL, in the DGLAP improved saturation model

Abstract

Higher twist effects in the deeply inelastic scattering are studied. We start with a short review of the theoretical results on higher twists in QCD. Within the saturation model we perform a twist analysis of the nucleon structure functions FT and FL at small value of the Bjorken variable x. The parameters of the model are fitted to the HERA F2 data, and we derive a prediction for the longitudinal structure function FL. We conclude that for FL the higher twist corrections are sizable whereas for F2 = FT + FL there is a nearly complete cancellation of twist-4 corrections in FT and FL. We discuss a few consequences for future LHC measurements.

27 pages, 11 figures

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• Parton distributions for the LHC
• Exclusive diffractive processes at HERA within the dipole picture
• A Global Fit to Scattering Data with NLL BFKL Resummations
• Drell-Yan production and Lam-Tung relation in the Color Glass Condensate formalism
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Cited by in corpus (13)

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• Structure Functions
• Twist expansion of Drell-Yan structure functions in color dipole approach
• Drell-Yan process at forward rapidity at the LHC
• Saturation in inclusive production beyond leading logarithm accuracy
• Evidence of strong higher twist effects in diffractive DIS at HERA at moderate Q2
• Evidence of quasi-partonic higher-twist effects in deep inelastic scattering at HERA at moderate $Q^2$
• Evolution of the longitudinal structure function at small x
• Effect of the parameterization of the distribution functions on the longitudinal structure function at small $x$
• Twist decomposition of non-linear effects in Balitsky-Kovchegov evolution of proton structure functions
• Higher twists effects in DIS on nuclei at the EIC and LHeC: A phenomenological analysis
• Investigation of the ratio $\frac{{\sigma }_r}{F_2}(Q^2/s,Q^2)$ in the momentum-space approach