ИСТИНА

We investigate associated prompt photon and hadronic jet production at the LHC energies using the kT -factorization approach. Our consideration is based on the O(alpha alpha_S^2) off-shell gluon-gluon fusion subprocess g∗g∗ -> \gamma q qbar and several subleading quark-initiated contributions from O(alpha alpha_S) and O(alpha alpha_S^2) subprocesses, taken into account in the conventional (collinear) QCD factorization. The transverse momentum dependent (or unintegrated) gluon densities in a proton are derived from Catani-Ciafaloni-Fiorani-Marchesini (CCFM) evolution equation. We achieve reasonably good agreement with the experimental data taken by CMS and ATLAS Collaborations and demonstrate the importance of initial state parton showers for jet determination in the kT-factorization approach.