The contribution of off-shell gluons to the structure functions F 2 and $F_{\mathrm {L}}^c$ and the unintegrated gluon distributions

A.V. Kotikov, A.V. Lipatov, G. Parente, N.P. Zotov
2002 European Physical Journal C: Particles and Fields  
We calculate the perturbative parts of the structure functions F_2^c and F_L^c for a gluon target having nonzero transverse momentum squared at order α_s. The results of the double convolution (with respect to the Bjorken variable x_B and the transverse momentum) of the perturbative part and the unintegrated gluon densities are compared with HERA experimental data for F_2^c. The contribution from F_L^c structure function ranges (10-30) that of F_2^c at the kinematical range of HERA experiments.
doi:10.1140/epjc/s2002-01036-y fatcat:rxpj27orhzepnnwbctqjgv7pjy