Longitudinal Structure Function F L of Proton from Regge Like Behaviour of Structure Function at Small-x

Abstract

The evolutions of longitudinal structure function FL from quantum chromodynamics (QCD) evolution equation in next-to-leading order at small-x is presented using the Regge like behaviour of the structure function. The proposed simple analytical expression for FL structure function provides the t- and x-evolution equations to study the behaviour of FL structure function at small-x. The calculated results are compared with the data of H1, ZEUS collaborations and results of Block model, Donnachie–Landshoff model. Our calculated results can be described within the framework of perturbative QCD.