PRODUCTION OF ISOLATED PHOTONS WITH LARGE TRANSVERSE MOMENTA AT LHC IN THE REGGE LIMIT OF QCD

The article discusses the production of prompt isolated photons with large transverse momenta at the LHC at energies s = 8 and 13 TeV in the parton Reggeization approach, which is based on the factorizationtheorem for hard processes at high energies and the effective theory of Reggeized gluons and quarks by L.N. Lipatov. Unintegrated parton distributions in the parton Reggeization approach were obtained in the modified KimberMartinRyskin model proposed earlier by the authors of the article. In numerical calculations, only the contribution of the main parton process, R +Q( Q) + q(q), is taken into account,since the contribution of other processes does not exceed 510 %. The calculation results are compared with the predictions obtained in the collinear parton model. Good agreement of calculations in the partonReggeization approach with experimental data obtained by the ATLAS collaboration is shown.