The contribution of off-shell gluons to the structure functions F_2^c and F_L^c$ and the unintegrated gluon distributions

Details The contribution of off-shell gluons to the structure functions F_2^c and F_L^c$ and the unintegrated gluon distributions The contribution of off-shell gluons to the structure functions F_2^c and F_L^c$ and the unintegrated gluon distributions

2001-07-12

arxiv.org/abs/hep-ph/0107135v1

Eur.Phys.J.C26:51-66,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

34 pages, 8 figures

Scientific paper

10.1140/epjc/s2002-01036-y

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 $\alpha_s$. 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)% of that of $F_2^c$ at the kinematical range of HERA experiments.

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