Investigating F_L(x,Q2) at fixed energy in the color dipole formalism

Abstract

At small-x, the structure function F_L(x,Q2) is driven by the gluon content of the nucleon target and consequently it can unravel the underlying QCD dynamics in that region. In this work, one studies its behavior on photon virtuality Q2 at fixed energy within the color dipole formalism for models considering parton saturation effects. The reason is that they resum a wide class of higher-twist contributions, which have important influence in F_L description towards low Q2. It is shown that the geometric scaling property holds for the longitudinal cross section. Moreover, the effective anomalous dimension in scaling dipole cross sections can be investigated by studing both the turn over and the large Q2 regions of the recent experimental measurements.

13 pages, 5 figures. Includes new analyzes as a comparison with NLO and NNLO QCD calculations. Some model predictions have been revised and title has a shorter version. Extended version to be published in European Physical Journal C

References in corpus (4)

• The role of F_L(x,Q^2) in parton analyses
• Determination of the longitudinal proton structure function FL at low Q2 at HERA
• Structure Function $F_L$ at Fixed $W$ in the $K_T$-Factorization Approach
• Importance of a Measurement of F_L(x,Q^2) at HERA

Cited by in corpus (11)

• Saturation physics at HERA and RHIC: An unified description
• Scattering of Dark Particles with Light Mediators
• Could saturation effects be visible in a future electron-ion collider?
• Investigating the inclusive transverse spectra in high-energy $pp$ collisions in the context of geometric scaling framework
• Constraining the nuclear gluon distribution in $eA$ processes at RHIC
• Gluon saturation and the Froissart bound: a simple approach
• Heavy Quark Photoproduction in Coherent Interactions at High Energies
• The color dipole picture for prompt photon production in $pp$ and $pPb$ collisions at the CERN-LHC
• Analytical solution of the longitudinal structure function $F_L$ in the leading and next-to-leading-order analysis at low x with respect to Laguerre polynomials method
• Experimental tests of small-x QCD
• Longitudinal Structure Function at the Limit $x=Q^2/s$