The longitudinal structure function F_L: perturbative QCD and k_T-factorization versus experimental data at fixed W

A. V. Kotikov, A. V. Lipatov, N. P. Zotov

We use results for the structure functions $F_L$ for a gluon target having nonzero transverse momentum square at order ${\alpha }_s$, obtained in our previous paper, to compare with recent…