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The prompt photon production in hadronic collisions has a long history ofproviding information on the substructure of hadrons and testing theperturbative techniques of QCD. Some valuable information about the partondensities in the nucleon and nuclei, especially of the gluon, can also beachieved by analysing the measurements of the prompt photon production crosssection whether inclusively or in association with heavy quarks or jets. Inthis work, we present predictions for the inclusive isolated prompt photonproduction in $ pp $ collisions at center-of-mass energy of 13 TeV usingvarious modern PDF sets. The calculations are presented both as a function ofphoton transverse energy $ E_\textrm{T}^\gamma $ and pseudorapidity $\eta^\gamma $ for the ATLAS kinematic coverage. We also study in detail thetheoretical uncertainty in the cross sections due to the variation of therenormalization, factorization and fragmentation scales. Moreover, we introduceand calculate the ratios of photon momenta for different rapidity regions andstudy the impact of various input PDFs on such quantity.

Predictions for the isolated prompt photon production at the LHC at $ \sqrt s= $13 TeV