Production of Single Isolated Photons in the Parton Reggeization Approach

Abstract

In the article, we study the processes of single isolated photon production at the LHC energies in the framework of the parton reggeization approach taking into account LO \(\mathcal{O}({{\alpha }^{1}}\alpha _{S}^{0})\) and NLO* \(\mathcal{O}({{\alpha }^{1}}\alpha _{S}^{0})\) contributions, the last one includes only tree–level corrections. Reggeized amplitudes are constructed according to the effective field theory formalism for multi–Regge kinematics processes suggested by L.N. Lipatov. To avoid the double counting between tree–level corrections and unintegrated parton distribution functions, a subtraction scheme is introduced. The results of calculations are compared with experimental data.